Supplemental Prospectus (Form 424B5)

Filed Pursuant to Rule 424(b)(5)

Registration Statement 333-286638

PROSPECTUS SUPPLEMENT

(to Prospectus dated April 29, 2025)

5,929,944Shares of Common Stock

Pre-Funded Warrants to Purchase 12,149,200 Shares of Common Stock

Series C Warrants to Purchase 18,079,144 Shares of Common Stock

Placement Agent Warrants to Purchase 903,957 Shares of Common Stock

31,132,301Shares of Common Stock underlying the Pre-Funded Warrants, Series C Warrants and Placement Agent Warrants

We are offering to certain investors 5,929,944 shares of our common stock, par value $0.001 per share (the "common stock"), together with Series C Warrants (the "Series C Warrants") to purchase 18,079,144 shares of common stock at a combined offering price of $1.77 per share. The shares of common stock and Series C Warrants will be separately issued but must be purchased together in this offering. Each share of common stock is being sold together with one Series C Warrant to purchase one share of common stock. The Series C Warrants are immediately exercisable, will expire five years from the date of issuance and will have an exercise price of $1.65 per share.

We are also offering pre-funded warrants ("Pre-Funded Warrants") to purchase 12,149,200 shares of common stock to those purchasers whose purchase of shares of common stock in this offering would result in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding common stock following the consummation of this offering in lieu of the shares of our common stock that would result in ownership in excess of 4.99% (or, at the election of the purchaser, 9.99%). Each Pre-Funded Warrant will be exercisable for one share of common stock at an exercise price of $0.001 per share. Each Pre-Funded Warrant is being issued together with the same Series C Warrant described above being issued with each share of common stock. The combined offering price for each such Pre-Funded Warrant, together with the Series C Warrant, is $1.769, which is equal to the price per share of common stock and the accompanying Series C Warrant being sold in this offering, less the $0.001 per share exercise price of each such Pre-Funded Warrant. Each Pre-Funded Warrant will be exercisable upon issuance and will expire when exercised in full. The Pre-Funded Warrants and Series C Warrants are immediately separable and will be issued separately in this offering but must be purchased together in this offering. For each Pre-Funded Warrant we sell, the number of shares of common stock we are offering will be decreased on a one-for-one basis. This offering also relates to the shares of common stock issuable upon exercise of the Pre-Funded Warrants and the Series C Warrants.

Our common stock is currently listed on the Nasdaq Capital Market ("Nasdaq") under the symbol "SLNH." On December 3, 2025, the closing price of our common stock on Nasdaq was $1.76 per share. There is no established public trading market for the Pre-Funded Warrants or Series C Warrants, and we do not expect a market to develop. We do not intend to apply for listing of the Pre-Funded Warrants or Series C Warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the Pre-Funded Warrants and Series C Warrants will be limited.

We have engaged H.C. Wainwright & Co., LLC, or the placement agent, as our exclusive placement agent in connection with this offering. The placement agent has no obligation to buy any of the securities from us or to arrange for the purchase or sale of any specific number or dollar amount of securities. We have agreed to pay the placement agent the placement agent fees set forth in the table below.

		Per Share and Accompanying Series C Warrant				Per Pre-Funded Warrant and Accompanying Series C Warrant				Total
Offering price		$	1.770			$	1.769			$	31,987,936
Placement agent fees(1)		$	0.124			$	0.124			$	2,240,006
Proceeds, before expenses, to Soluna Holdings, Inc.		$	1.646			$	1.645			$	29,760,079

(1)

We have agreed to pay the placement agent a cash fee of 7.0% of the gross proceeds from this offering. See "Plan of Distribution" beginning on page S-15 of this prospectus supplement for additional information with respect to the compensation we will pay the placement agent. This prospectus supplement and accompanying prospectus also registers the offer and sale of these placement agent warrants (the "Placement Agent Warrants") and the shares of common stock issuable upon exercise of the Placement Agent Warrants.

Investing in our securities involves a high degree of risk. See the section titled "Risk Factors" beginning on page S-6 of this prospectus supplement and in the documents incorporated by reference into this prospectus supplement for a discussion of risks that should be considered in connection with an investment in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement. Any representation to the contrary is a criminal offense.

We are a "smaller reporting company," and as such, we have elected to take advantage of certain reduced public company reporting requirements for this prospectus supplement and future filings. See "Prospectus Summary-Implications of Being a Smaller Reporting Company."

The delivery of the shares of common stock, Series C Warrants, and Pre-Funded Warrants to purchasers is expected to be made on or about December 5, 2025, subject to satisfaction of customary closing conditions.

H.C. Wainwright & Co.

The date of this prospectus supplement is December 4, 2025.

TABLE OF CONTENTS

PROSPECTUS SUPPLEMENT

	Page
ABOUT THIS PROSPECTUS SUPPLEMENT	S-ii
CAUTIONARY NOTE CONCERNING FORWARD-LOOKING STATEMENTS	S-iii
PROSPECTUS SUPPLEMENT SUMMARY	S-1
THE OFFERING	S-4
RISK FACTORS	S-6
USE OF PROCEEDS	S-8
DIVIDEND POLICY	S-9
DILUTION	S-10
DESCRIPTION OF SECURITIES WE ARE OFFERING	S-11
PLAN OF DISTRIBUTION	S-15
LEGAL MATTERS	S-16
EXPERTS	S-16
INFORMATION INCORPORATED BY REFERENCE	S-17
WHERE YOU CAN FIND MORE INFORMATION	S-18

PROSPECTUS

	Page
ABOUT THIS PROSPECTUS	1
PROSPECTUS SUMMARY	2
RISK FACTORS	8
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS	9
USE OF PROCEEDS	10
THE SECURITIES WE MAY OFFER	11
DESCRIPTION OF CAPITAL STOCK	12
DESCRIPTION OF WARRANTS	18
DESCRIPTION OF DEBT SECURITIES	19
DESCRIPTION OF SUBSCRIPTION RIGHTS	24
DESCRIPTION OF UNITS	25
FORMS OF SECURITIES	26
PLAN OF DISTRIBUTION	28
LEGAL MATTERS	32
EXPERTS	33
ADDITIONAL INFORMATION	34
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE	35

ABOUT THIS PROSPECTUS SUPPLEMENT

We incorporate by reference important information into this prospectus supplement and the accompanying prospectus. You may obtain the information incorporated by reference without charge by following the instructions under "Where You Can Find More Information." You should carefully read this prospectus supplement and the accompanying prospectus as well as additional information described under "Information Incorporated by Reference," before deciding to invest in our securities.

We have not, and the placement agent has not, authorized anyone to provide any information or to make any representations other than those contained in this prospectus supplement and the accompanying prospectus or in any free writing prospectuses prepared by or on behalf of us or to which we have referred you. We take no responsibility for and can provide no assurance as to the reliability of, any other information that others may give you. This prospectus supplement and the accompanying prospectus is an offer to sell only the securities offered hereby, and only under circumstances and in jurisdictions where it is lawful to do so. The information contained in this prospectus supplement and the accompanying prospectus or in any applicable free writing prospectus is current only as of its date, regardless of its time of delivery or any sale of our securities. Our business, financial condition, results of operations and prospects may have changed since that date.

The information incorporated by reference or provided in this prospectus supplement and the accompanying prospectus contains statistical data and estimates, including those relating to market size and competitive position of the markets in which we participate, that we obtained from our own internal estimates and research, as well as from industry and general publications and research, surveys and studies conducted by third parties. Industry publications, studies and surveys generally state that they have been obtained from sources believed to be reliable. While we believe our internal company research is reliable and the definitions of our market and industry are appropriate, neither this research nor these definitions have been verified by any independent source.

For investors outside the United States: We have not, and the placement agent has not, done anything that would permit this offering or possession or distribution of this prospectus supplement in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus supplement must inform themselves about, and observe any restrictions relating to, the offering of the securities and the distribution of this prospectus supplement outside the United States.

This prospectus supplement and the accompanying prospectus and the information incorporated by reference into this prospectus supplement and the accompanying prospectus contain references to our trademarks and to trademarks belonging to other entities. Solely for convenience, trademarks and trade names referred to in this prospectus supplement and the accompanying prospectus and the information incorporated by reference into this prospectus supplement, including logos, artwork, and other visual displays, may appear without the ® or TM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the rights of the applicable licensor to these trademarks and trade names. We do not intend our use or display of other companies' trade names or trademarks to imply a relationship with, or endorsement or sponsorship of us by, any other company.

CAUTIONARY NOTE CONCERNING FORWARD-LOOKING STATEMENTS

This prospectus supplement and the accompanying prospectus and the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, contain, and our officers and representatives may from time to time make, forward-looking statements that involve substantial risks and uncertainties. In some cases, you can identify forward-looking statements by terms such as "may," "will," "should," "expect," "plan," "anticipate," "could," "intend," "target," "project," "estimate," "believe," "estimate," "predict," "potential" or "continue" or the negative of these terms or other similar expressions intended to identify statements about the future. These statements speak only as of the date of this prospectus supplement and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements include, without limitation, statements about the following:

●	the availability of financing opportunities, risks associated with economic conditions, dependence on management and conflicts of interest;
●	the ability to service debt obligations and maintain flexibility in respect of debt covenants;
●	economic dependence on regulated terms of service and electricity rates;
●	the speculative and competitive nature of the technology sector;
●	our ability to attract and retain hosted customers for our hosting operations;
●	dependency in continued growth in blockchain and cryptocurrency usage;
●	lawsuits and other legal proceedings and challenges;
●	conflict of interests with directors and management;
●	government regulations;
●	our ability to construct and complete the anticipated expansion of our data centers;
●	the impact of global economic and market conditions and political developments on our business, including, among others, tariffs, rising inflation and capital market disruptions, economic sanctions, bank failures, regional conflicts around the world, and economic slowdowns or recessions that may result from such developments which could harm our research and development efforts as well as the value of our common stock and our ability to access capital markets; and
●	other factors beyond our control.

The foregoing does not represent an exhaustive list of matters that may be covered by the forward-looking statements contained herein and in the documents incorporated by reference herein or risk factors that we are faced with that may cause our actual results to differ from those anticipate in our forward-looking statements. Factors that may affect our results include, but are not limited to, the risks and uncertainties discussed in the "Risk Factors" section on page S-6 of this prospectus supplement, in our most recent Annual Report on Form 10-K or in other reports we file with the SEC.

Moreover, new risks regularly emerge, and it is not possible for our management to predict or articulate all risks we face, nor can we assess the impact of all risks on our business or the extent to which any risk, or combination of risks, may cause actual results to differ from those contained in any forward-looking statements. The Private Securities Litigation Reform Act of 1995 and Section 27A of the Securities Act do not protect any forward-looking statements that we make in connection with this offering. All forward-looking statements included in this prospectus supplement and the accompanying prospectus and in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus are based on information available to us on the date of this prospectus supplement or the date of the applicable document incorporated by reference. Except to the extent required by applicable laws or rules, we undertake no obligation to publicly update or revise any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained above and throughout this prospectus supplement and the accompanying prospectus and in the documents incorporated by reference in this prospectus supplement. We qualify all of our forward-looking statements by these cautionary statements. We have expressed our expectations, beliefs and projections in good faith and believe they have a reasonable basis. However, we cannot assure you that our expectations, beliefs or projections will result or be achieved or accomplished.

You should rely only on the information in this prospectus supplement and the accompanying prospectus. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely upon it.

PROSPECTUS SUPPLEMENT SUMMARY

This summary highlights information about our company, this offering and information contained in greater detail in other parts of this prospectus supplement and the accompanying prospectus or incorporated by reference into this prospectus supplement and the accompanying prospectus from our filings with the Securities and Exchange Commission ("SEC") listed in the section titled "Information Incorporated by Reference." Because it is only a summary, it does not contain all of the information that you should consider before purchasing our securities in this offering and it is qualified in its entirety by, and should be read in conjunction with, the more detailed information appearing elsewhere or incorporated by reference into this prospectus supplement and the accompanying prospectus. You should read the entire prospectus supplement, and the accompanying prospectus, and the information incorporated by reference into this prospectus supplement and the accompanying prospectus in their entirety, including the "Risk Factors" and our financial statements and the related notes incorporated by reference into this prospectus supplement and the accompanying prospectus, before purchasing our securities in this offering. Except as otherwise indicated herein or as the context otherwise requires, references in this prospectus supplement to "Soluna" "the Company," "we," "us" and "our" refer to Soluna Holdings, Inc. and its subsidiaries.

Corporate Overview

Our mission is to make renewable energy a global superpower using computing as a catalyst.

We develop and operate digital infrastructure that taps into a growing global opportunity: the convergence of renewable energy and High-Performance Computing ("HPC"). We call this model Renewable Computing™.

Across the world, vast amounts of clean energy go to waste due to curtailment. At the same time, there is a critical shortage of power for energy-intensive infrastructure like Artificial Intelligence ("AI"), HPC, and Bitcoin mining. Renewable Computing™ bridges this gap-unlocking stranded renewable energy and turning it into scalable computing power.

We build, own or co-own, and operate data centers co-located with wind, solar, and hydroelectric plants. Our modular and scalable design supports high-throughput, batchable applications such as Bitcoin, and soon, HPC/AI workloads. These facilities are managed by MaestroOS™, our proprietary operating system ("MaestroOS"), which continuously analyzes signals like local power pricing, weather, grid demand, and market conditions to optimize performance and economics.

This intelligent orchestration enables long-term asset monetization and attractive returns on invested capital. Our approach is purpose-built for the energy transition. We specialize in curtailment solutions, working closely with leading renewable energy developers to access underutilized, low-cost power. Our behind-the-meter model allows us to draw energy directly from the plant or the grid, while also providing demand response services-reducing costs and enhancing grid resilience.

A key strategic advantage is our model of co-locating data centers directly with renewable power generation assets. By building behind the meter, we are able to bypass long interconnection queues and source electricity directly from the generation site. This structure not only improves power economics but also accelerates time-to-market-an increasingly important factor for companies with large, time-sensitive computing workloads such as AI and HPC.

With a repeatable strategy and a growing pipeline of projects, we are scaling a new category of digital infrastructure-one that energizes the grid, lowers computing costs, and advances a more sustainable future.

We operate across multiple business lines and generate revenue from four primary sources, as described below:

	●	Bitcoin Mining Business - We mine Bitcoin through proprietary operations and joint ventures located at our data centers.
	●	Bitcoin Hosting Business - We provide hosting services to third-party Bitcoin mining customers at our data centers.
	●	High Performance Computing Business - We offer colocation and hosting services for companies seeking to train large language models, fine-tune existing artificial intelligence models, and deploy other compute-intensive AI or HPC workloads.
	●	Demand Response Business - We leverage our data center infrastructure to provide demand response services to grid operators.

Lines of Business

Bitcoin Mining Business

We engage in proprietary Bitcoin mining, a process that verifies transactions and secures the Bitcoin blockchain. This process involves the use of specialized computing equipment to solve complex cryptographic algorithms. Miners compete to solve these algorithms; the first to do so is awarded a predetermined number of newly issued Bitcoins (the "Block Reward") and any transaction fees associated with that block.

We participate in one or more mining pools-collaborative networks of miners who combine computing power to improve the probability of earning rewards. Block Rewards earned by the pool are distributed among participants based on each member's proportional contribution. This model helps reduce revenue volatility compared to solo mining operations.

Our mining operations are energy-intensive and require significant computational resources. We operate data centers equipped with both proprietary and third-party hardware and software. Our proprietary data center operating system, MaestroOS, is used to optimize performance, manage power consumption, and increase operational efficiency.

Revenue from Bitcoin mining consists of Block Rewards and transaction fees and is recognized upon receipt in accordance with applicable accounting guidance. Upon receipt, all digital assets are promptly converted into U.S. dollars through the Coinbase cryptocurrency exchange.

The profitability of this business is affected by several variables, including the market price of Bitcoin, global network hash rate, mining difficulty, electricity and infrastructure costs, and mining pool fees. In addition, Bitcoin undergoes a periodic "halving" event approximately every four years, reducing the Block Reward and potentially impacting future revenue. For the three and nine months ended September 30, 2025, our Bitcoin Mining Business represented approximately 33% and 42% of total revenue. For the three and nine months ended September 30, 2024, our Bitcoin Mining Business represented approximately 37% and 46% of total revenue.

Bitcoin Hosting Business

We provide colocation and hosting services for third-party Bitcoin mining customers at our data centers. Customers contract space based on their power requirements. Our current customer base includes several large-scale ("Hyperscale") Bitcoin miners. Contracts typically range from 12 to 24 months in duration.

We offer two primary commercial structures:

	1	Fixed-Fee Model - Customers pay a fixed fee based on the volume of energy consumed.
	2	Profit-Share Model - Customers pay a share of the profits from their mining activity, with power costs passed through.

For the three and nine months ended September 30, 2025, our Bitcoin Hosting Business accounted for approximately 62% and 53% of total revenue. For the three and nine months ended September 30, 2024, our Bitcoin Hosting Business accounted for approximately 57% and 49% of total revenue. Revenue in the Bitcoin Hosting Business was concentrated among a small number of customers. For the three months ended September 30, 2025, two customers made up approximately 63% of hosting revenue and 40% of total revenue. For the nine months ended September 30, 2025, three customers made up approximately 80% of hosting revenue and 42% of total revenue.

High Performance Computing Business

In June 2024, we began providing Graphic Processing Units ("GPUs") as-a-Service in partnership with Hewlett Packard Enterprise Company ("HPE"), offering GPU resources to startups, enterprises, and GPU marketplaces for a fee. As further described in our Annual Report on Form 10-K for the year ended December 31, 2024, we terminated our agreement with HPE.

We are currently developing new infrastructure projects intended to support AI and HPC workloads. These efforts include engagement with potential joint venture partners, conducting site and feasibility studies, securing access to power and land, and performing other early-stage development activities.

Our first planned AI/HPC colocation project is Project Kati, which is in advanced development. Additional projects, including the announced Project Rosa, are also in progress. For the fiscal year 2024 and the nine months ended September 30, 2025, we generated minimal revenue from our HPC Business.

Demand Response Business

We provide demand response services to grid operators and utilities by leveraging our data centers as dispatchable energy resources. In select states where we operate, our data centers are enrolled in ancillary services programs that support grid reliability.

Under these programs, we commit to reducing a facility's power consumption to a predetermined level when called upon by the grid operator. In return, we receive compensation for maintaining this dispatch capability, provided we meet specific performance criteria. For example, to qualify for compensation in a given period-typically monthly-the data center must meet minimum uptime and availability requirements.

For the three and nine months ended September 30, 2025, our Demand Response Business represented approximately 5% and 5% of total revenue. For the three and nine months ended September 30, 2024, our Demand Response Business represented approximately 6% and 5% of total revenue.

Implications of Being a Smaller Reporting Company

We qualify as a "smaller reporting company" under applicable SEC regulations. A smaller reporting company may take advantage of reduced reporting requirements that are otherwise applicable to public companies. These provisions include, but are not limited to:

	●	being permitted to present only two years of audited financial statements and only two years of related "Management's Discussion and Analysis of Financial Condition and Results of Operations" disclosure in our periodic reports and registration statements, including this prospectus supplement, and reduced disclosure about our executive compensation arrangements;
	●	not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, as amended, on the effectiveness of our internal controls over financial reporting; and
	●	reduced disclosure obligations regarding executive compensation arrangements in our periodic reports, proxy statements and registration statements, including this prospectus supplement.

We will continue to be a smaller reporting company as long as we have a public float (determined as of the end of our second fiscal quarter) of less than $250 million or have annual revenues of less than $100 million as of the last fiscal year for which we have audited financial statements and a public float of less than $700 million.

We have elected to take advantage of certain of the reduced disclosure obligations in the registration statement of which this prospectus supplement is a part and may elect to take advantage of other reduced reporting requirements in future filings. As a result, the information that we provide to our stockholders may be different than you might receive from other public reporting companies in which you hold equity interests.

Corporate Information

Soluna Holdings, Inc. ("SHI"), formerly known as Mechanical Technology, Incorporated, which was originally incorporated in the State of New York in 1961, reincorporated in the State of Nevada on March 29, 2021, and is headquartered in Albany, New York. Effective November 2, 2021, the Company changed its name from "Mechanical Technology, Incorporated" (or "MTI") to "Soluna Holdings, Inc." On October 29, 2021, Soluna Callisto Holdings, Inc. merged into Soluna Computing, Inc. ("SCI"), a private green data center development company and a subsidiary of SHI. MTI Instruments, Inc., a subsidiary of SHI, was sold on April 11, 2022. On March 23, 2021, our common stock commenced trading on the Nasdaq. We formed a wholly owned subsidiary of SHI on December 27, 2023, Soluna Digital, Inc. ("SDI"). Effective December 31, 2023, SCI transferred substantially all of its assets to SHI or its subsidiaries, including SDI.

Our principal executive office is located at 325 Washington Avenue Extension, Albany, NY 12205, and our phone number is (516) 216-9257. Our principal website address is www.solunacomputing.com.

Information contained in, or accessible through, our website does not constitute part of this prospectus supplement and inclusions of our website address in this prospectus supplement are inactive textual references only. You should not rely on any such information in making your decision whether to purchase our securities.

We make available free of charge on or through our website access to press releases and investor presentations, as well as all materials that we file electronically with the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports, filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act of 1934, as amended (the "Exchange Act"), as soon as reasonably practicable after electronically filing such materials with, or furnishing them to, the SEC. The SEC maintains an Internet website, www.sec.gov, that contains reports, proxy and information statements and other information that we file electronically with the SEC.

THE OFFERING

Common Stock to be Offered		5,929,944 shares based on the sale of our common stock at a combined offering price of $1.77 per share of common stock and accompanying Series C Warrant.
Pre-Funded Warrants to be Offered		Pre-Funded Warrants to purchase up to 12,149,200 shares of our common stock. Each Pre-Funded Warrant will be exercisable for one share of our common stock. The purchase price of each Pre-Funded Warrant and accompanying Series C Warrant will equal the price at which the share of common stock and accompanying Series C Warrant are being sold in this offering, minus $0.001, and the exercise price of each Pre-Funded Warrant will be $0.001 per share. The Pre-Funded Warrants will be exercisable immediately and may be exercised at any time until all of the Pre-Funded Warrants are exercised in full. The Pre-Funded Warrants are not and will not be listed for trading on any national securities exchange This offering also relates to the shares of common stock issuable upon exercise of the Pre-Funded Warrants sold in this offering.
Series C Warrants to be Offered		Each share of our common stock and each Pre-Funded Warrant to purchase one share of our common stock is being sold together with one Series C Warrant to purchase one share of our common stock. Each Series C Warrant will have an exercise price of $1.65 per share and will be exercisable immediately. The Series C Warrants will expire five years from the date of issuance. The shares of common stock and Pre-Funded Warrants, and the accompanying Series C Warrants, as the case may be, can only be purchased together in this offering but will be issued separately and will be immediately separable upon issuance. The Series C Warrants are not and will not be listed for trading on any national securities exchange. This prospectus supplement also related to the offering of the shares of common stock issuable upon exercise of the Series C Warrants.
Common Stock to be Outstanding Immediately After this Offering		98,574,468 shares (assuming full exercise of Pre-Funded Warrants and assuming no exercise of the Series C Warrants).

Use of Proceeds		We currently intend to use the net proceeds from the offering for working capital, project-level equity, and general corporate purposes. See "Use of Proceeds" for additional information.
Risk Factors		An investment in our securities involves a high degree of risk. See "Risk Factors" beginning on page S-6 of this prospectus and the other information included and incorporated by reference in this prospectus for a discussion of the risk factors you should carefully consider before deciding to invest in our securities.
National Securities Exchange Listing		Our common stock is currently listed on Nasdaq under the symbol "SLNH." There is no established public trading market for the Pre-Funded Warrants or Series C Warrants, and we do not expect a market to develop. In addition, we do not intend to apply to list the Pre-Funded Warrants or Series C Warrants on Nasdaq or on any other national securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the Pre-Funded Warrants and Series C Warrants will be limited.

The above discussion and table are based on 92,644,524 shares of our common stock outstanding as of December 3, 2025, and excludes:

●	2,645 shares of our common stock issuable upon the exercise of options outstanding at a weighted average exercise price of $21.46 per share;
●	123,455 shares of our common stock underlying restricted stock units;
●	1,250,000 shares of our common stock issuable upon conversion of our Series B Convertible Preferred Stock, par value $0.001 per share (the "Series B Preferred Stock"); and
●	3,466,739 shares of our common stock issuable upon the exercise of outstanding warrants, including pre-funded warrants, at a weighted average exercise price of $3.27 per share.

As of December 3, 2025, we had 4,928,545 shares of our 9.0% Series A Cumulative Perpetual Preferred Stock issued and outstanding (the "Series A Preferred Stock") and 62,500 shares of our Series B Preferred Stock issued and outstanding.

RISK FACTORS

Before purchasing any of the securities you should carefully consider the risk factors set forth below and incorporated by reference in this prospectus supplement from our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, and any subsequent updates described in our Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, as well as the risks, uncertainties and additional information set forth in our SEC reports on Forms 10-K, 10-Q, and 8-K and in the other documents incorporated by reference in this prospectus supplement. For a description of these reports and documents, and information about where you can find them, see "Additional Information" and "Incorporation of Certain Information By Reference." Additional risks not presently known or that we presently consider to be immaterial could subsequently materially and adversely affect our financial condition, results of operations, business, and prospects.

Purchasers in this offering will experience immediate dilution in the book value of their investment.

The offering price of our common stock is higher than the net tangible book value per share of our common stock before giving effect to this offering. Accordingly, if you purchase our common stock in this offering you will incur immediate dilution in the book value of the shares of common stock you purchase. See the section entitled "Dilution" below for a detailed illustration of the dilution you would incur if you participate in this offering.

We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

Our management will have broad discretion in the application of the net proceeds, including for any of the purposes described in the section of this prospectus supplement titled "Use of Proceeds." You will be relying on the judgment of our management with regard to the use of these net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the net proceeds are being used appropriately. The failure by our management to apply these funds effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our securities to decline and delay the development of our product candidates. Pending the application of these funds, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

We may issue additional equity or convertible debt securities in the future, which may result in additional dilution to investors.

To the extent we need to raise additional capital in the future and we issue additional shares of common stock or securities exercisable, convertible or exchangeable for our common stock, our then existing stockholders may experience dilution and the new securities may have rights senior to those of our common stock offered in this offering. The exercise of outstanding stock options and warrants, including those sold in this offering, may also result in dilution of your investment.

There is no public market for the Series C Warrants or Pre-Funded Warrants being offered by us in this offering.

There is no established public trading market for the Series C Warrants or the Pre-Funded Warrants, and we do not expect a market to develop. In addition, we do not intend to apply to list the Series C Warrants or Pre-Funded Warrants on Nasdaq or any other national securities exchange or other nationally recognized trading system. Without an active market, the liquidity of the Series C Warrants and Pre-Funded Warrants will be limited.

The Series C Warrants and Pre-Funded Warrants are speculative in nature.

The Series C Warrants and Pre-Funded Warrants offered hereby do not confer any rights of common stock ownership on their holders, such as voting rights, but rather merely represent the right to acquire shares of common stock at a fixed price. Specifically, commencing on the date of issuance, holders of the Pre-Funded Warrants may acquire the shares of common stock issuable upon exercise of such warrants at an exercise price of $0.001 per share of common stock, and holders of the Series C Warrants may acquire the shares of common stock issuable upon exercise of such warrants at an exercise price of $1.65 per share of common stock. There can be no assurance that the market price of the shares of common stock will ever equal or exceed the exercise price of the Pre-Funded Warrants, and consequently, whether it will ever be profitable for holders of Series C Warrants to exercise the Series C Warrants or for holders of the Pre-Funded Warrants to exercise the Pre-Funded Warrants.

Holders of the Pre-Funded Warrants and the Series C Warrants offered hereby will have no rights as common stockholders with respect to the shares our common stock underlying the warrants until such holders exercise their warrants and acquire our common stock, except as otherwise provided in the Pre-Funded Warrants and the Series C Warrants.

Until holders of the Series C Warrants and the Pre-Funded Warrants acquire shares of our common stock upon exercise thereof, such holders will have no rights with respect to the shares of our common stock underlying such warrants, except to the extent that holders of such Series C Warrants and Pre-Funded Warrants will have certain rights to participate in distributions or dividends paid on our common stock as set forth in the Series C Warrants and the Pre-Funded Warrants. Upon exercise of the Series C Warrants and the Pre-Funded Warrants, the holders will be entitled to exercise the rights of a common stockholder only as to matters for which the record date occurs after the exercise date.

USE OF PROCEEDS

We estimate that the net proceeds from the offering will be approximately $29.7 million, after deducting the placement agent fees and estimated offering expenses payable by us, and excluding the proceeds, if any, from the exercise of the Series C Warrants issued in this offering. We will receive only nominal additional proceeds from the exercise of Pre-Funded Warrants.

We intend to use the net proceeds from the offering for working capital, project-level equity, and general corporate purposes. These expected uses represent our intentions based upon our current plans and business conditions, which could change in the future as our plans and business conditions evolve.

As of the date of this prospectus supplement, we cannot specify with certainty all of the particular uses for the net proceeds from this offering. As a result, our management will have broad discretion in the application of the net proceeds from this offering, and the investors will be relying on the judgment of our management regarding the application of the net proceeds from this offering. The amounts and timing of our actual expenditures will depend on numerous factors, including factors described under "Risk Factors" in this prospectus supplement and the documents incorporated by reference herein and therein.

DIVIDEND POLICY

We currently intend to retain earnings, if any, to fund the development and growth of our business and do not anticipate paying cash dividends for the foreseeable future. Payment of future cash dividends, if any, will be at the discretion of our board of directors after taking into account various factors, including our financial condition, operating results, current and anticipated cash needs and plans for expansion.

DILUTION

If you invest in our securities in this offering, your ownership interest will be immediately diluted to the extent of the difference between the offering price per share and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering. Dilution per share to new investors is determined by subtracting pro forma as adjusted net tangible book value per share after this offering from the offering price per share paid by new investors.

As of September 30, 2025, we had a net tangible book value of approximately $62.9 million, or approximately $0.98 per share of common stock. Our net tangible book value per share represents total tangible assets less total liabilities, divided by the number of shares of common stock outstanding at September 30, 2025.

After giving further effect to the issuance and sale by us of 5,929,944 shares of our common stock in this offering at an offering price of $1.77 per share (or Pre-funded Warrants in lieu thereof) and accompanying Series C Warrant and after deducting the estimated placement agent fees and commissions and estimated offering expenses payable by us, our as adjusted net tangible book value as of September 30, 2025 would have been approximately $92.5 million, or approximately $1.16 per share. This amount represents an immediate increase in net tangible book value of approximately $0.18 per share to our existing stockholders and an immediate dilution in net tangible book value of approximately $0.61 per share to new investors purchasing shares of common stock in this offering.

The following table illustrates this dilution on a per share, as adjusted, basis:

Offering price per share and accompanying Series C Warrant						$	1.77
Net tangible book value per share as of September 30, 2025		$	0.98
Increase in net tangible book value per share attributable to this offering			0.18
As adjusted net tangible book value per share after this offering							1.16
Dilution per share to new investors participating in this offering						$	0.61

The number of shares of our common stock that will be outstanding immediately after this offering as shown above is based on 62,092,531 shares outstanding as of September 30, 2025, and excludes as of that date:

●	2,645 shares of our common stock issuable upon the exercise of options outstanding at a weighted average exercise price of $21.46 per share;
●	199,190 shares of our common stock underlying restricted stock units;
●	1,250,000 shares of our common stock issuable upon conversion of our Series B Preferred Stock; and
●	7,722,890 shares of our common stock issuable upon the exercise of outstanding warrants, including pre-funded warrants, at a weighted average exercise price of $2.06 per share.

To the extent that outstanding exercisable options or warrants are exercised, there may be further dilution to investors participating in this offering. In addition, we may choose to raise additional capital because of market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future operating plans. If we raise additional capital through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to our stockholders.

DESCRIPTION OF SECURITIES WE ARE OFFERING

The following summary of the rights of the securities we are offering is not complete and is subject to and qualified in its entirety by reference to our Articles of Incorporation, as amended (the "Articles of Incorporation"), and our Bylaws (the "Bylaws"), copies of which are filed as exhibits to the registration statement of which this prospectus supplement forms a part.

We are offering 5,929,944 shares of our common stock and Series C Warrants to purchase 18,079,144 shares of common stock. We are also offering Pre-Funded Warrants to purchase 12,149,200 shares of common stock to those purchasers whose purchase of shares of common stock in this offering would result in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding shares of common stock following the consummation of this offering in lieu of the shares of common stock that would result in such excess ownership. Each Pre-Funded Warrant will be exercisable for one share of common stock. No warrant for fractional shares of common stock will be issued, rather warrants will be issued only for whole shares of common stock. We are also registering the offer and sale of the shares of common stock issuable from time to time upon exercise of the Pre-Funded Warrants and Series C Warrants offered hereby, as well as the shares of common stock issuable from time to time upon exercise of the Placement Agent Warrants registered hereby.

We have authorized capital stock consisting of 375,000,000 shares of common stock and 10,000,000 shares of preferred stock, par value $0.001 per share, of which 6,040,000 shares have been designated as shares of Series A Preferred Stock and 187,500 have been designated as Series B Preferred Stock, as of December 3, 2025. Unless stated otherwise, the following discussion summarizes the terms and provisions of our Articles of Incorporation and our Bylaws. This description is summarized from, and qualified in its entirety by reference to, our Articles of Incorporation and our Bylaws, which are filed as exhibits to the registration statement of which this prospectus forms a part, and the applicable provisions of the Nevada Revised Statutes, as amended (the "NRS"). For a description of the terms of our preferred stock, see Exhibit 4.14 to our Annual Report on Form 10-K, filed with the SEC on March 31, 2025.

Common Stock

Voting rights. The holders of our common stock are entitled to one vote per share held on all matters on which a vote of our common stockholders is taken. Stockholders do not have cumulative voting rights in the election of directors. The election of directors of the Company is decided by plurality vote and all other questions are decided by a majority of the votes cast by our stockholders present in person or by proxy, except as otherwise required by the NRS or our Articles of Incorporation. Our Articles of Incorporation provide that notwithstanding any other provision of our Articles of Incorporation or our Bylaws (and notwithstanding the fact that some lesser percentage may be specified by law, the Articles of Incorporation, or the Bylaws), any director or the entire Board may be removed at any time, but only for cause upon the affirmative vote of 75% or more of the outstanding shares of capital stock entitled to vote for the election of directors at a meeting called for that purpose.

The Board is divided into three classes, with each class consisting, as nearly as may be possible, of one-third of the total number of directors, with the terms of the classes scheduled to expire in successive years. At each annual meeting of the Company's stockholders, the stockholders elect the members of a single class of directors for three-year terms.

Dividends. The holders of our common stock are entitled to receive dividends when, as, and if declared by the Board, out of funds legally available therefor.

Liquidation. Except as otherwise provided under our Articles of Incorporation (including the terms of any preferred stock), upon liquidation, dissolution, or the winding up of the Company, holders of our common stock are entitled to receive any remaining assets of the Company in proportion to the respective number of shares held after payment of and reservation for Company liabilities.

Preemptive Rights. The holders of shares of our common stock do not have any preemptive right to subscribe for or purchase any shares of any class or series of our capital stock.

Redemption Rights. Shares of our common stock are not subject to redemption by the Company. To the extent that the Company issues additional shares of common stock, the relative interest in the Company of existing stockholders will likely be diluted.

Anti-Takeover Effects of Certain Provisions of Our Articles of Incorporation and Bylaws, and Nevada Law

Our Articles of Incorporation and Bylaws contain provisions and terms that may delay, defer, or prevent a tender offer or change in control of the Company that a stockholder might consider to be in his, her, or its best interests, including attempts that might result in a premium being paid over the market price for shares of our Common Stock. The Company expects that such provisions and terms may have the effect of discouraging extraordinary corporate transactions with respect to the Company, such as hostile takeover bids, and will instead encourage any potential acquiror of the Company to first correspond with our Board. These provisions and terms include:

●	Special meetings of stockholders may only be called by the by the chairman of the board or the chief executive officer, or, if there be no chairman of the board and no chief executive officer, by the president, and shall be called by the secretary upon the written request of at least a majority of the Board or the holders of not less than a majority of the voting power of the Company's stock entitled to vote.
●	The Company maintains a classified Board that is divided into three classes serving for respective three-year terms. As a result, it would take at least two successive annual meetings of shareholders to replace a majority of the members of our Board.
●	Vacancies on the Board may be filled by majority vote of remaining directors then in office, even if less than a quorum, with the individual elected to serve for the remainder of the unexpired term.
●	Any director of the Company may be removed from service as a director only after the affirmative vote of 75% or more of outstanding shares of stock entitled to vote for the election of directors, at a meeting called for that purpose.

Nevada's "combinations with interested stockholders" statutes, NRS 78.411 through 78.444, inclusive, prohibit specified types of business "combinations" between certain Nevada corporations and any person deemed to be an "interested stockholder" for two years after such person first becomes an "interested stockholder" unless the corporation's board of directors approves the combination (or the transaction by which such person becomes an "interested stockholder") in advance, or unless the combination is approved by the board of directors and sixty percent of the corporation's voting power not beneficially owned by the interested stockholder, its affiliates and associates. Further, in the absence of prior approval certain restrictions may apply even after such two year period. However, these statutes do not apply to any combination of a corporation and an interested stockholder after the expiration of four years after the person first became an interested stockholder. For purposes of these statutes, an "interested stockholder" is any person who is (1) the beneficial owner, directly or indirectly, of ten percent or more of the voting power of the outstanding voting shares of the corporation, or (2) an affiliate or associate of the corporation and at any time within the two previous years was the beneficial owner, directly or indirectly, of ten percent or more of the voting power of the then outstanding shares of the corporation. The definition of the term "combination" is sufficiently broad to cover most significant transactions between a corporation and an "interested stockholder." These statutes generally apply to Nevada corporations with 200 or more stockholders of record. However, a Nevada corporation may elect in its articles of incorporation not to be governed by these particular laws, but if such election is not made in the corporation's original articles of incorporation, the amendment (1) must be approved by the affirmative vote of the holders of stock representing a majority of the outstanding voting power of the corporation not beneficially owned by interested stockholders or their affiliates and associates, and (2) is not effective until 18 months after the vote approving the amendment and does not apply to any combination with a person who first became an interested stockholder on or before the effective date of the amendment. We made an election to opt out of these statutes in our original articles of incorporation and have not amended such provision.

Nevada's "acquisition of controlling interest" statutes (NRS 78.378 through 78.3793, inclusive) contain provisions governing the acquisition of a controlling interest in certain Nevada corporations. These "control share" laws provide generally that any person that acquires a "controlling interest" in certain Nevada corporations may be denied voting rights, unless a majority of the disinterested stockholders of the corporation elect to restore such voting rights. These laws will apply to us as of a particular date if we were to have 200 or more stockholders of record (at least 100 of whom have addresses in Nevada appearing on our stock ledger at all times during the 90 days immediately preceding that date) and do business in the State of Nevada directly or through an affiliated corporation, unless our Articles of Incorporation or Bylaws in effect on the tenth day after the acquisition of a controlling interest provide otherwise. These laws provide that a person acquires a "controlling interest" whenever a person acquires shares of a subject corporation that, but for the application of these provisions of the NRS, would enable that person to exercise (1) one-fifth or more, but less than one-third, (2) one-third or more, but less than a majority, or (3) a majority or more of all of the voting power of the corporation in the election of directors. Once an acquirer crosses one of these thresholds, shares which it acquired in the transaction taking it over the threshold and within the 90 days immediately preceding the date when the acquiring person acquired or offered to acquire a controlling interest become "control shares" to which the voting restrictions described above apply. These laws may have a chilling effect on certain transactions if our Articles of Incorporation or Bylaws are not timely amended to provide that these provisions do not apply to us or to an acquisition of a controlling interest, or if our disinterested stockholders do not confer voting rights in the control shares.

Further, NRS 78.139 provides that directors may resist a change or potential change in control of a corporation if the board of directors determines that the change or potential change in control is opposed to or not in the best interest of the corporation upon consideration of any relevant facts, circumstances, contingencies or constituencies pursuant to NRS 78.138(4).

We expect the existence of these provisions may have an anti-takeover effect with respect to transactions that our Board does not approve in advance and could result in making it more difficult to accomplish transactions that our stockholders may see as beneficial such as (i) discouraging business combinations that might result in a premium over the market price for the shares of our Common Stock; (ii) discouraging hostile takeovers which could inhibit temporary fluctuations in the market price of our Common Stock that often result from actual or rumored hostile takeover attempts; and (iii) preventing changes in our management.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Equiniti Trust Company, LLC (the "Transfer Agent") (formerly: American Stock Transfer & Trust Company, LLC). The Transfer Agent's address is 48 Wall Street, 23rd Floor, New York, NY 10005.

National Securities Exchange Listing

Our common stock is currently listed on Nasdaq under the symbol "SLNH."

Series C Warrants

The following is a summary of certain terms and provisions of the Series C Warrants that are being offered hereby, is not complete and is subject to, and qualified in its entirety by, the provisions of the Series C Warrant, the form of which will be filed as an exhibit to our Current Report on Form 8-K. Prospective investors should carefully review the terms and provisions of the form of Series C Warrant for a complete description of the terms and conditions of the Series C Warrants.

Duration and Exercise Price. Each Series C Warrant offered hereby will have an exercise price equal to $1.65. The Series C Warrants will be immediately exercisable and will expire five years from the date of issuance. The exercise price and number of shares of common stock issuable upon exercise is subject to appropriate adjustment in the event of stock dividends, stock splits, reorganizations or similar events affecting our common stock and the exercise price. The Series C Warrants will be issued separately from the common stock or Pre-Funded Warrants, respectively, and may be transferred separately immediately thereafter. The Series C Warrants will be issued in certificated form only.

Exercisability. The Series C Warrants will be exercisable, at the option of each holder, in whole or in part, by delivering to us a duly executed exercise notice accompanied by payment in full for the number of shares of our common stock purchased upon such exercise (except in the case of a cashless exercise as discussed below). A holder (together with its affiliates) may not exercise any portion of such holder's Series C Warrants to the extent that the holder would own more than 4.99% of the outstanding common stock immediately after exercise, except that upon at least 61 days' prior notice from the holder to us, the holder may increase the amount of ownership of outstanding stock after exercising the holder's Series C Warrants up to 9.99% of the number of shares of our common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Series C Warrants.

Cashless Exercise. If, at the time a holder exercises its Series C Warrants, a registration statement registering the issuance or resale of the shares of common stock underlying the Series C Warrants under the Securities Act is not then effective or available for the issuance of such shares, then in lieu of making the cash payment otherwise contemplated to be made to us upon such exercise in payment of the aggregate exercise price, the holder may elect instead to receive upon such exercise (either in whole or in part) the net number of shares of common stock determined according to a formula set forth in the Series C Warrants.

Fundamental Transactions. In the event of any fundamental transaction, as described in the Series C Warrants and generally including any merger or consolidation with or into another entity, sale of all or substantially all of our assets, tender offer or exchange offer, or reclassification of our common stock, then upon any subsequent exercise of a Series C Warrant, the holder will have the right to receive as alternative consideration, for each share of our common stock that would have been issuable upon such exercise immediately prior to the occurrence of such fundamental transaction, the number of shares of common stock of the successor or acquiring corporation or of our company, if it is the surviving corporation, and any additional consideration receivable upon or as a result of such transaction by a holder of the number of shares of our common stock for which the Series C Warrants is exercisable immediately prior to such event. Notwithstanding the foregoing, in the event of a fundamental transaction, the holders of the Series C Warrants have the right to require us or a successor entity to redeem the Series C Warrants for cash in the amount of the Black-Scholes Value (as defined in the Series C Warrants) of the remaining unexercised portion of the Series C Warrants on the date of the consummation of such fundamental transaction, concurrently with or within 30 days following the consummation of a fundamental transaction.

However, in the event of a fundamental transaction which is not in our control, including a fundamental transaction not approved by our board of directors, the holders of the Series C Warrants will only be entitled to receive from us or our successor entity, as of the date of consummation of such fundamental transaction the same type or form of consideration (and in the same proportion), at the Black Scholes Value of the unexercised portion of the Series C Warrant that is being offered and paid to the holders of our common stock in connection with the fundamental transaction, whether that consideration is in the form of cash, stock or any combination of cash and stock, or whether the holders of our common stock are given the choice to receive alternative forms of consideration in connection with the fundamental transaction.

Transferability. Subject to applicable laws, the Series C Warrants may be transferred at the option of the holder upon surrender of the Series C Warrants to us together with the appropriate instruments of transfer.

Fractional Shares. No fractional shares of common stock will be issued upon the exercise of the Series C Warrants. Rather, the number of shares of common stock to be issued will, at our election, either be rounded up to the nearest whole number or we will pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the exercise price.

Trading Market. There is no established trading market for the Series C Warrants, and we do not expect an active trading market to develop. We do not intend to apply to list the Series C Warrants on the Nasdaq or any other securities exchange or other trading market. Without a trading market, the liquidity of the Series C Warrants will be extremely limited.

Right as a Stockholder. Except as otherwise provided in the Series C Warrants or by virtue of the holder's ownership of shares of our common stock, such holder of Series C Warrants does not have the rights or privileges of a holder of our common stock, including any voting rights, until such holder exercises such holder's Series C Warrants.

Waivers and Amendments. No term of a Series C Warrants may be amended or waived without the written consent of the Company and the holder of such Series C Warrants.

Pre-Funded Warrants

The following summary of certain terms and provisions of the Pre-Funded Warrants that are being offered hereby is not complete and is subject to, and qualified in its entirety by, the provisions of the Pre-Funded Warrant, the form of which has been filed as an exhibit to the registration statement of which this prospectus forms a part. Prospective investors should carefully review the terms and provisions of the form of Pre-Funded Warrant for a complete description of the terms and conditions of the Pre-Funded Warrants.

Duration and Exercise Price. Each Pre-Funded Warrant offered hereby will have an initial exercise price per share of common stock equal to $0.001. The Pre-Funded Warrants will be immediately exercisable and will expire when exercised in full. The exercise price and number of shares of common stock issuable upon exercise is subject to appropriate adjustment in the event of share dividends, share splits, reorganizations or similar events affecting our shares of common stock and the exercise price.

Exercisability. The Pre-Funded Warrants will be exercisable, at the option of each holder, in whole or in part, by delivering to us a duly executed exercise notice accompanied by payment in full for the number of shares of common stock purchased upon such exercise (except in the case of a cashless exercise as discussed below). A holder (together with its affiliates) may not exercise any portion of the Pre-Funded Warrant to the extent that the holder would own more than 4.99% of the outstanding shares of common stock immediately after exercise, except that upon at least 61 days' prior notice from the holder to us, the holder may increase the amount of beneficial ownership of outstanding shares after exercising the holder's Pre-Funded Warrants up to 9.99% of the number of our shares of common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Pre-Funded Warrants. Purchasers of Pre-Funded Warrants in this offering may also elect prior to the issuance of the Pre-Funded warrants to have the initial exercise limitation set at 9.99% of our outstanding shares of common stock.

Cashless Exercise. In lieu of making the cash payment otherwise contemplated to be made to us upon such exercise in payment of the aggregate exercise price, the holder may elect instead to receive upon such exercise (either in whole or in part) the number of shares of common stock determined according to a formula set forth in the Pre-Funded Warrants.

Fractional Shares. No fractional shares of common stock will be issued upon the exercise of the Pre-Funded Warrants. Rather, at our election, the number of shares of common stock to be issued will be rounded up to the nearest whole number or we will pay a cash adjustment in an amount equal to such fraction multiplied by the exercise price.

Transferability. Subject to applicable laws, a Pre-Funded Warrant may be transferred at the option of the holder upon surrender of the Pre-Funded Warrants to us together with the appropriate instruments of transfer.

Trading Market. There is no trading market available for the Pre-Funded Warrants on any securities exchange or nationally recognized trading system, and we do not expect a trading market to develop. We do not intend to list the Pre-Funded Warrants on Nasdaq or any other securities exchange or nationally recognized trading market. Without a trading market, the liquidity of the Pre-Funded Warrants will be extremely limited. The shares of common stock issuable upon exercise of the Pre-Funded Warrants are currently traded on Nasdaq.

Right as a Stockholder. Except as otherwise provided in the Pre-Funded Warrants or by virtue of such holder's ownership of shares of common stock, the holders of the Pre-Funded Warrants do not have the rights or privileges of holders of our shares of common stock, including any voting rights, until they exercise their Pre-Funded Warrants. The Pre-Funded Warrants will provide that holders have the right to participate in distributions or dividends paid on our shares of common stock.

Fundamental Transaction. In the event of a fundamental transaction, as described in the Pre-Funded Warrants and generally including any reorganization, recapitalization or reclassification of our shares of common stock, the sale, transfer or other disposition of all or substantially all of our properties or assets, our consolidation or merger with or into another person, or any person or group becoming the beneficial owner of 50% of the voting power represented by our outstanding securities, the holders of the Pre-Funded Warrants will be entitled to receive upon exercise of the Pre-Funded Warrants the kind and amount of securities, cash or other property that the holders would have received had they exercised the Pre-Funded Warrants immediately prior to such fundamental transaction on a net exercise basis.

PLAN OF DISTRIBUTION

We have engaged H.C. Wainwright & Co., LLC (the "placement agent") to act as our exclusive placement agent, on a reasonable best-efforts basis, in connection with this offering pursuant to this prospectus supplement and accompanying prospectus. The terms of this offering are subject to market conditions and negotiations between us, the placement agent, and prospective investors. Our engagement letter with the placement agent does not give rise to any commitment by the placement agent to purchase any of the securities, and the placement agent will have no authority to bind us by virtue of the engagement letter. The placement agent is not purchasing the securities offered by us in this offering and is not required to sell any specific number or dollar amount of securities but will assist us in this offering on a reasonable best-efforts basis. Further, the placement agent does not guarantee that it will be able to raise new capital in any prospective offering. The placement agent may engage sub-agents or selected dealers to assist with the offering. We have entered into a securities purchase agreement directly with the investors in connection with this offering, and we will only sell to investors who have entered into the securities purchase agreement. We may not sell the entire amount of shares of our common stock offered or Pre-Funded Warrants pursuant to this prospectus supplement.

We expect to deliver the shares of our common stock, Series C Warrants, and Pre-Funded Warrants being offered pursuant to this prospectus supplement on or about December 5, 2025, subject to satisfaction of customary closing conditions.

An associated person of the placement agent has agreed to purchase in this offering, on the same terms and conditions, an aggregate of 1,129,944 shares of common stock and Series C warrants to purchase up to 1,129,944 shares of our common stock for a total purchase price of $2,000,000.88.

Fees and Expenses

The following table shows the per share and total cash fees we will pay to the placement agent in connection with the sale of our securities offered pursuant to this prospectus supplement and the accompanying prospectus, assuming the purchase of all of the securities offered hereby.

		Per Share and Accompanying Series C Warrant				Per Pre-Funded Warrant and Accompanying Series C Warrant				Total
Offering price		$	1.770			$	1.769			$	31,987,936
Placement agent fees		$	0.124			$	0.124			$	2,240,006
Proceeds, before expenses, to Soluna Holdings, Inc.		$	1.646			$	1.645			$	29,760,079

We have agreed to pay the placement agent in connection with this offering a cash fee equal to 7.0% of the aggregate gross proceeds of this offering.

We estimate that the total expenses payable by us in connection with this offering, excluding the placement agent fees and expenses referred to above, will be approximately $60,000.

Placement Agent Warrants

In addition, we have agreed to issue to the placement agent, or its designees, at the closing of this offering, Placement Agent Warrants to purchase 5.0% of the number of shares of our common stock and Pre-Funded Warrants sold in this offering, at an exercise price of $2.2125 per share (equal to 125% of the offering price per share in this offering).

The Placement Agent Warrants will expire on the date that is five years from the commencement of the sales pursuant to this offering. Except as provided above, the Placement Agent Warrants will have substantially the same terms as the Series C Warrants. The Placement Agent Warrants and the shares of common stock issuable upon exercise of the Placement Agent Warrants are being registered hereby.

Tail Financing Payments

We have also agreed to pay the placement agent, subject to certain exceptions, a tail fee equal to the cash and warrant compensation in this offering, if any investor, with whom the placement agent had back-and-forth correspondence (written or oral) during the term of its engagement, provides us with capital in any public or private offering or other financing or capital raising transaction during the 18-month period following the termination or expiration of our engagement letter with the placement agent.

Lock-up Agreement

We, and each of our officers and directors, have agreed to be subject to a lock-up for a period of ninety (90) days following the date of closing of the offering pursuant to this prospectus supplement and accompanying prospectus. This means that, during the applicable lock-up period, we may not issue, enter into any agreement to issue or announce the issuance or proposed issuance of any shares of common stock or their equivalents, and such persons may not offer for sale, contract to sell, sell, distribute, grant any option, right or warrant to purchase, pledge, hypothecate or otherwise dispose of, directly or indirectly, any of our shares of common stock or any securities convertible into, or exercisable or exchangeable for, shares of common stock, in each case subject to certain exceptions. In addition, subject to certain exceptions, we have agreed to not issue any securities that are subject to a price reset based on the trading prices of our common stock or upon a specified or contingent event in the future, or enter into any agreement to issue securities at a future determined price for a period of six (6) months following the closing date of this offering, subject to an exception.

Indemnification

We have agreed to indemnify the placement agent and specified other persons against certain liabilities relating to or arising out of the placement agent's activities under its engagement letter, including liabilities under the Securities Act, and to contribute to payments that the placement agent may be required to make in respect of such liabilities.

Regulation M

The placement agent may be deemed to be an underwriter within the meaning of Section 2(a)(11) of the Securities Act, and any commissions received by it and any profit realized on the resale of the shares sold by it while acting as principal might be deemed to be underwriting discounts or commissions under the Securities Act. As an underwriter, the placement agent would be required to comply with the requirements of the Securities Act and the Exchange Act, including, without limitation, Rule 415(a)(4) under the Securities Act and Rule 10b-5 and Regulation M under the Exchange Act. These rules and regulations may limit the timing of purchases and sales of shares by the placement agent acting as principal. Under these rules and regulations, the placement agent:

●

may not engage in any stabilization activity in connection with our securities; and

●

may not bid for or purchase any of our securities or attempt to induce any person to purchase any of our securities, other than as permitted under the Exchange Act, until they have completed their participation in the distribution.

Nasdaq Listing

Our common stock is listed on Nasdaq under the symbol "SLNH."

Other Relationships

From time to time, the placement agent has provided and may provide in the future, various advisory, investment and commercial banking and other services to us in the ordinary course of business, for which it may receive customary fees and commissions. However, except as disclosed in this prospectus supplement, we have no present arrangements with the placement agent for any further services. The placement agent acted as our exclusive placement agent in connection with our July 2025 public offering, and acts as our exclusive sales agent in connection with our "at-the-market" offering we initiated in April 2025, and received compensation in connection with each such offering.

LEGAL MATTERS

The validity of the shares of our common stock being offered hereby and certain other matters of Nevada law will be passed upon for us by Brownstein Hyatt Farber Schreck, LLP, Las Vegas, Nevada. The validity of the other securities offered hereby will be passed upon for us by Lowenstein Sandler LLP, New York, New York. The Placement Agent is being represented by Ellenoff Grossman & Schole LLP, New York, New York.

EXPERTS

The consolidated balance sheets of Soluna Holdings, Inc. and its subsidiaries as of December 31, 2024 and 2023, and the related consolidated statements of operations, changes in equity, and cash flows for each of the years then ended have been audited by UHY LLP, independent registered public accounting firm, as stated in their report which is incorporated herein by reference. Such financial statements have been incorporated herein by reference in reliance on the report of such firm given upon their authority as experts in accounting and auditing.

INFORMATION INCORPORATED BY REFERENCE

The SEC allows us to "incorporate by reference" information that we file with it into this prospectus supplement, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus supplement. The information incorporated by reference is considered to be a part of this prospectus supplement, and information that we file later with the SEC will automatically update and supersede information contained in this prospectus supplement.

We incorporate by reference the following documents or information that we have filed with the SEC:

●	our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC on March 31, 2025;
●	our Quarterly Reports on Form 10-Q for the periods ended March 31, 2025, filed with the SEC on May 15, 2025, June 30, 2025, filed with the SEC on August 14, 2025, and September 30, 2025, filed with the SEC on November 14, 2025;
●	our Current Reports on Form 8-K filed with the SEC on February 10, 2025, March 18, 2025, March 27, 2025, March 28, 2025, April 29, 2025, May 8, 2025, July 3, 2025, July 9, 2025, July 17, 2025, August 8, 2025, August 20, 2025, September 16, 2025, September 23, 2025, October 6, 2025, October 21, 2025, November 10, 2025 and December 5, 2025 (other than any portions thereof deemed furnished and not filed); and
●	the description of our common stock contained in our Registration Statement on Form 8-A, filed with the SEC on March 22, 2021, as updated by the Description of Securities set forth on Exhibit 4.14 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, as filed with the SEC on March 31, 2025, including any amendments thereto or reports filed for the purposes of updating this description.

All other reports and documents filed by us pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date that this registration statement becomes effective and after the date of this prospectus supplement but before the termination of the offering of the securities described in this prospectus supplement shall be deemed to be incorporated by reference into this prospectus supplement.

Notwithstanding the statements in the preceding paragraphs, no document, report or exhibit (or portion of any of the foregoing) or any other information that we have "furnished" to the SEC pursuant to the Exchange Act shall be incorporated by reference into this prospectus supplement.

Any statement contained in this prospectus supplement or contained in a document incorporated or deemed to be incorporated by reference into this prospectus supplement will be deemed to be modified or superseded to the extent that a statement contained in this prospectus supplement or any subsequently filed supplement to this prospectus supplement, or document deemed to be incorporated by reference into this prospectus supplement, modifies or supersedes such statement. Any statements so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement.

You may request a copy of these filings at no cost, by writing or telephoning us at the following address:

Soluna Holdings, Inc.
325 Washington Avenue Extension
Albany, NY 12205

(518) 218-2550

Attn: Christopher Gandolfo
[email protected]

WHERE YOU CAN FIND MORE INFORMATION

This prospectus supplement and the accompanying prospectus are part of a registration statement we filed with the SEC. This prospectus supplement does not contain all of the information set forth in or incorporated by reference in the registration statement and the exhibits to the registration statement.

For further information with respect to us and the securities we are offering under this prospectus supplement, we refer you to the registration statement and the exhibits and schedules filed as a part of the registration statement. You should rely only on the information contained in this prospectus supplement or incorporated by reference into this prospectus supplement. We have not authorized anyone else to provide you with different information. We are not making an offer of these securities in any jurisdiction where the offer is not permitted. You should assume that the information contained in this prospectus supplement, or any document incorporated by reference in this prospectus supplement, is accurate only as of the date of those respective documents, regardless of the time of delivery of this prospectus or any sale of our securities.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings are available to the public from commercial document retrieval services and over the Internet at the SEC's website at http://www.sec.gov.

We maintain a website at www.solunacomputing.com. You may access our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act with the SEC free of charge at our website as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. The information contained in, or that can be accessed through, our website is not incorporated by reference into, and is not part of, this prospectus supplement.

PROSPECTUS

Soluna Holdings, Inc.

$100,000,000

Common Stock

Preferred Stock

Warrants

Debt Securities

Subscription Rights

Units

We may offer, issue and sell from time to time together or separately, in one or more offerings, any combination of (i) our common stock, par value $0.001 per share ("common stock"), (ii) our preferred stock, which we may issue in one or more series, (iii) warrants, (iv) senior or subordinated debt securities, (v) subscription rights and (vi) units. The debt securities may consist of debentures, notes, or other types of debt. The debt securities, preferred stock, warrants and subscription rights may be convertible into, or exercisable or exchangeable for, common or preferred stock or other securities of ours. The units may consist of any combination of the securities listed above.

The aggregate public offering price of the securities that we are offering will not exceed $100,000,000. We will offer the securities in an amount and on terms that market conditions will determine at the time of the offering. Our common stock and our 9.0% Series A Cumulative Perpetual Preferred Stock, par value $0.001 per share (the "Series A Preferred Stock"), are listed on the Nasdaq Capital Market under the symbols "SLNH" and "SLNHP", respectively. The last reported sale price for our common stock and our Series A Preferred Stock on April 17, 2025 on the Nasdaq Capital Market was $0.62 and $4.60, respectively. You are urged to obtain current market quotations of our common stock and Series A Preferred Stock. As of the date of this prospectus, we have no warrants, debt securities, subscription rights or units listed or quoted on any securities exchange or other nationally recognized trading market. Each prospectus supplement will indicate if the securities offered thereby will be listed or quoted on any securities exchange or another nationally recognized trading market.

As of the date of this prospectus, the aggregate market value of our outstanding common stock held by non-affiliates, or the public float, was $14,027,685, which was calculated based on 9,542,643 shares of our outstanding common stock held by non-affiliates at a price of $1.47 per share, the closing price of our common stock on February 19, 2025. Pursuant to General Instruction I.B.6 of Form S-3, in no event will we sell securities pursuant to this prospectus with a value of more than one-third of the aggregate market value of our common stock held by non-affiliates in any 12-month period, so long as the aggregate market value of our common stock held by non-affiliates is less than $75,000,000. During the 12 calendar months prior to, and including, the date of this prospectus, we have not sold any securities pursuant to General Instruction I.B.6 of Form S-3.

Investing in our securities involves risk. You should carefully consider the risks that we refer you to under the section captioned "Risk Factors" in this prospectus on page 8 and in other filings we make with the Securities and Exchange Commission before buying our securities.

Should we offer any of the securities described in this prospectus, we will provide you with the specific terms of the particular securities being offered in a supplement to this prospectus. You should read this prospectus and any supplement, together with additional information described under the headings "Additional Information" and "Incorporation of Certain Information by Reference" carefully before you invest. This prospectus may not be used to sell securities unless accompanied by a prospectus supplement.

We may sell these securities directly to our stockholders or to other purchasers or through agents on our behalf or through underwriters or dealers as designated from time to time. If any agents or underwriters are involved in the sale of any of these securities, the applicable prospectus supplement will provide the names of the agents or underwriters and any applicable fees, commissions or discounts.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is April 29, 2025.

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS	1
PROSPECTUS SUMMARY	2
RISK FACTORS	8
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS	9
USE OF PROCEEDS	10
THE SECURITIES WE MAY OFFER	11
DESCRIPTION OF CAPITAL STOCK	12
DESCRIPTION OF WARRANTS	18
DESCRIPTION OF DEBT SECURITIES	19
DESCRIPTION OF SUBSCRIPTION RIGHTS	24
DESCRIPTION OF UNITS	25
FORMS OF SECURITIES	26
PLAN OF DISTRIBUTION	28
LEGAL MATTERS	32
EXPERTS	33
ADDITIONAL INFORMATION	34
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE	35

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (the "SEC") using a "shelf" registration process. Under this shelf registration process, we may from time to time offer and sell, in one or more offerings, any or all of the securities described in this prospectus, separately or together, up to an aggregate offering price of $100,000,000. This prospectus provides you with a general description of the securities we may offer. When we issue securities pursuant to this prospectus, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the heading "Additional Information" and "Incorporation of Certain Information by Reference."

You may only rely on the information contained in this prospectus and the accompanying prospectus supplement or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We have not authorized anyone to provide you with different information. This prospectus and any prospectus supplement do not constitute an offer to sell or a solicitation of an offer to buy any securities other than the securities offered by this prospectus and the prospectus supplement. This prospectus and any prospectus supplement do not constitute an offer to sell or a solicitation of an offer to buy any securities in any circumstances in which such offer or solicitation is unlawful. Neither the delivery of this prospectus or any prospectus supplement nor any sale made hereunder shall, under any circumstances, create any implication that there has been no change in our affairs since the date of this prospectus or such prospectus supplement or that the information contained by reference to this prospectus or any prospectus supplement is correct as of any time after its date.

Unless otherwise stated or the context otherwise indicates, references to "Soluna," the "Company," "we," "our," "us," or similar terms refer to Soluna Holdings, Inc. and its subsidiaries.

PROSPECTUS SUMMARY

The following summary highlights some information from this prospectus. It is not complete and does not contain all of the information that you should consider before making an investment decision. You should read this entire prospectus, including the "Risk Factors" section on page 8 and the disclosures to which that section refers you, the financial statements and related notes and the other more detailed information appearing elsewhere or incorporated by reference into this prospectus before investing in any of the securities described in this prospectus.

Overview

Our mission is to make renewable energy a global superpower using computing as a catalyst.

We develop and operate digital infrastructure that taps into a growing global opportunity: the convergence of renewable energy and High-Performance Computing ("HPC"). We call this model Renewable Computing™.

Across the world, vast amounts of clean energy go to waste due to curtailment. At the same time, there is a critical shortage of power for energy-intensive infrastructure like artificial intelligence ("AI"), HPC, and Bitcoin mining. Renewable Computing™ bridges this gap-unlocking stranded renewable energy and turning it into scalable computing power.

We build, own or co-own, and operate data centers co-located with wind, solar, and hydroelectric plants. Our modular and scalable design supports high-throughput, batchable applications such as AI, Bitcoin, and-soon-HPC workloads. These facilities are managed by MaestroOS™, our proprietary operating system ("MaestroOS"), which continuously analyzes signals like local power pricing, weather, grid demand, and market conditions to optimize performance and economics.

This intelligent orchestration enables long-term asset monetization and attractive returns on invested capital. Our approach is purpose-built for the energy transition. We specialize in curtailment solutions, working closely with leading renewable energy developers to access underutilized, low-cost power. Our behind-the-meter model allows us to draw energy directly from the plant or the grid, while also providing demand response services-reducing costs and enhancing grid resilience.

A key strategic advantage is our model of co-locating data centers directly with renewable power generation assets. By building behind the meter, we are able to bypass long interconnection queues and source electricity directly from the generation site. This structure not only improves power economics, but also accelerates time-to-market-an increasingly important factor for companies with large, time-sensitive computing workloads such as AI and HPC.

With a repeatable strategy and a growing pipeline of projects, we are scaling a new category of digital infrastructure-one that energizes the grid, lowers computing costs, and advances a more sustainable future.

We operate across multiple business lines and generate revenue from four primary sources, as described below:

	●	Bitcoin Mining Business - We mine Bitcoin through proprietary operations and joint ventures located at our data centers.
	●	Bitcoin Hosting Business - We provide hosting services to third-party Bitcoin mining customers at our data centers.
	●	High Performance Computing Business - We offer colocation and hosting services for companies seeking to train large language models (LLMs), fine-tune existing artificial intelligence models, and deploy other compute-intensive AI or HPC workloads.
	●	Demand Response Business - We leverage our data center infrastructure to provide demand response services to grid operators.

Lines of Business

Bitcoin Mining Business

We engage in proprietary Bitcoin mining, a process that verifies transactions and secures the Bitcoin blockchain. This process involves the use of specialized computing equipment to solve complex cryptographic algorithms. Miners compete to solve these algorithms; the first to do so is awarded a predetermined number of newly issued Bitcoins (the "Block Reward") and any transaction fees associated with that block.

We participate in one or more mining pools-collaborative networks of miners who combine computing power to improve the probability of earning rewards. Block Rewards earned by the pool are distributed among participants based on each member's proportional contribution. This model helps reduce revenue volatility compared to solo mining operations.

Our mining operations are energy-intensive and require significant computational resources. We operate data centers equipped with both proprietary and third-party hardware and software. Our proprietary data center operating system, MaestroOS, is used to optimize performance, manage power consumption, and increase operational efficiency. Revenue from Bitcoin mining consists of Block Rewards and transaction fees and is recognized upon receipt in accordance with applicable accounting guidance. Upon receipt, all digital assets are promptly converted into U.S. dollars through the Coinbase cryptocurrency exchange.

The profitability of this business is affected by several variables, including the market price of Bitcoin, global network hash rate, mining difficulty, electricity and infrastructure costs, and mining pool fees. In addition, Bitcoin undergoes a periodic "halving" event approximately every four years, reducing the Block Reward and potentially impacting future revenue. For the year ended December 31, 2024, our Bitcoin Mining Business represented approximately 45% of total revenue.

Bitcoin Hosting Business

We provide colocation and hosting services for third-party Bitcoin mining customers at our data centers. Customers lease space based on their power requirements. Our current customer base includes several large-scale Bitcoin miners. Contracts typically range from 12 to 24 months in duration.

We offer two primary commercial structures:

1.	Fixed-Fee Model - Customers pay a fixed fee based on the volume of energy consumed.
2.	Profit-Share Model - Customers pay a share of the profits from their mining activity, with power costs passed through.

In 2024, our Bitcoin Hosting Business accounted for approximately 50% of total revenue. Revenue in this business was concentrated among a small number of customers. One customer accounted for 56% of hosting revenue and 28% of total revenue in 2024. This customer terminated its agreement during the fourth quarter of 2024. As of March 2025, we replaced 100% of the lost hosting capacity with minimal operational disruption.

High Performance Computing (HPC) Business

In June 2024, we began providing Graphic Processing Units ("GPUs")-as-a-Service in partnership with Hewlett Packard Enterprise Company ("HPE"), offering GPU resources to startups, enterprises, and GPU marketplaces for a fee. In March 2025, we terminated our agreement with HPE.

We are currently developing new infrastructure projects intended to support AI and HPC workloads. These efforts include engagement with potential joint venture partners, conducting site and feasibility studies, securing access to power and land, and performing other early-stage development activities.

Our first planned AI/HPC colocation project is Project Kati, which is in advanced development. Additional projects, including the announced Project Rosa, are also in progress. For the year ended December 31, 2024, we generated minimal revenue from our HPC Business.

Demand Response Business

We provide demand response services to grid operators and utilities by leveraging our data centers as dispatchable energy resources. In select states where we operate, our data centers are enrolled in ancillary services programs that support grid reliability.

Under these programs, we commit to reducing a facility's power consumption to a predetermined level when called upon by the grid operator. In return, we receive compensation for maintaining this dispatch capability, provided we meet specific performance criteria. For example, to qualify for compensation in a given period-typically monthly-the data center must meet minimum uptime and availability requirements.

For the year ended December 31, 2024, our Demand Response Business represented approximately 6% of total revenue.

Recent Developments

Soluna Cloud - Termination of HPE Agreement

Soluna launched Project Ada- its GPU-as-a-Service business, via Soluna Cloud, Inc. ("Soluna Cloud"), a subsidiary of the Company, earlier in 2024, in order to achieve two primary goals:

1.	Gain commercial experience in the AI/HPC market in support of future data center development focused on LLMs and other AI workloads.
2.	Capitalize on lower-cost capital to pursue high-growth revenue opportunities in the compute infrastructure market.

As a point of entry into Project Ada, Soluna AL CloudCo, LLC ("CloudCo"), a subsidiary of Soluna Cloud, entered into the HPC & AI Cloud Services Agreement and HPE Greenlake Services Custom Statement of Work with HPE on June 18, 2024, that provided data center and cloud services for AI and supercomputing applications, utilizing NVIDIA H100 GPUs (together with the associated Statement of Work, the "HPE Agreement").

At the time of launch, the market for NVIDIA H100 GPUs was characterized by constrained supply and strong pricing, which aligned with the economics of the fixed-cost HPE Agreement. However, by the end of 2024, the GPU market shifted significantly. Lead times for NVIDIA H100 GPUs shortened from over 50 weeks in 2023 to 8-12 weeks by the end of 2024, easing supply constraints and reducing urgency among buyers. At the same time, market demand shifted toward larger GPU clusters than those available under the HPE Agreement, making it difficult to secure long-term, reserved contracts at profitable rates. The expected release of NVIDIA's H200 Blackwell architecture also caused some customers to delay purchases. Although release timelines were impacted by design issues, the prospect of next-generation technology contributed to hesitancy in NVIDIA H100 GPU acquisition. Competitive pressure from alternative GPU vendors further softened demand and market pricing. As a result, Soluna Cloud's business progressed more slowly than anticipated. Revenues were first recognized in December 2024, with modest growth in early 2025. During the last six months, our engagement with potential financing and operating partners for AI/HPC confirmed that rather than continuing the effort to lease and resell GPU/HPC chips, refocusing on our core strength - creating, developing, financing and operating our extensive pipeline of potential bitcoin and AI hosting facilities - will create far more value for us and our shareholders.

In light of these developments, on March 24, 2025, CloudCo sent notice of its termination of the HPE Agreement for convenience. Subsequently, on March 26, 2025, HPE sent notice of its termination of the HPE Agreement for cause, effective immediately, due to CloudCo's material breach of its payment obligations that remained uncured for more than thirty (30) days. In accordance with the terms of the HPE Agreement, upon a termination for cause by HPE, CloudCo must pay HPE the remaining payment stream under the term of the HPE Agreement of approximately $19.3 million as of March 31, 2025, including all upfront payments and monthly charges, plus any fees incurred for the terminated Services (as defined in the HPE Agreement).

SEPA

On August 12, 2024, we entered into a Standby Equity Purchase Agreement (the "SEPA") with YA II PN, LTD., a Cayman Islands exempt limited company ("YA"). Pursuant to the terms of the SEPA, we agreed to issue and sell to YA, from time to time, and YA agreed to purchase from us, up to $25 million of shares of our common stock (the "SEPA Shares"). We and YA also entered into a registration rights agreement (the "Registration Rights Agreement"), pursuant to which we agreed to prepare and file with the SEC a Registration Statement on Form S-1, registering the resale of the SEPA Shares. On November 12, 2024, we filed a registration statement on Form S-1 (File No. 333-282559) with the SEC for the resale by YA of 3,000,000 SEPA Shares, which was declared effective by the SEC on February 5, 2025. As of the date of this prospectus, we have issued and sold approximately 1.5 million shares of our common stock to YA pursuant to the SEPA for aggregate net proceeds to us of approximately $2.0 million. We intend to continue issuing shares of our common stock to YA pursuant to the SEPA in future periods.

Assignment and Assumption Agreements

CloudCo, Soluna Cloud, and the Company, entered into assignment and assumption agreements on October 1, 2024, with one of the accredited investors issued convertible notes and Class A, Class B and Class C common stock purchase warrants on October 25, 2021 (the " Purchasers"), and two other parties introduced by that Purchaser, with respect to an aggregate of $1.25 million of notes ("Additional Notes") issued by CloudCo (the "Assignment Agreements"). Pursuant to the Assignment Agreements, we will be able to purchase such notes for a purchase price of $750 thousand, or 60% of face value. The assignment and assumption will be effective once all conditions of the agreement are met including fulfilling the purchase price. As of December 31, 2024, the assignment and assumption of the Additional Notes has not been become effective, however on March 14, 2025, the Company has fulfilled the agreement and assumed the assignment and assumption of the Additional Notes for the remaining outstanding balance.

Galaxy Note

On March 12, 2025, Soluna SW LLC (the "SW Borrower"), a Delaware limited liability company and a subsidiary of Soluna SW Holdings LLC ("SW Holdings"), a Delaware limited liability company and a subsidiary of Soluna Digital, Inc. ("SDI"), a Nevada corporation and a subsidiary of the Company, entered into a Loan Agreement (the "Galaxy Loan Agreement") with SW Holdings and Galaxy Digital LLC (the "Lender"). The Galaxy Loan Agreement comprises a term loan facility in the principal amount of $5.0 million (the "Term Loan Facility"). The Term Loan Facility bears interest at 15.0% per annum, unless an Event of Default (as defined therein) has occurred and is continuing, in which case the Galaxy Term Loan Facility shall bear interest at a rate of 5% above the then applicable interest rate. The Term Loan Facility will mature on March 12, 2030 and will be paid over a five-year term.

June SPA Modification

On June 20, 2024, pursuant to the terms and subject to the conditions of a Note Purchase Agreement (the "June SPA") by and among (i) CloudCo, (ii) Soluna Cloud, (iii) the Company and (iv) the accredited investor named therein (the "Investor" and collectively, the "Note Parties), CloudCo issued to the Investor a secured promissory note in a principal amount equal to $12.5 million (the "Note").

On March 23, 2025, the Note Parties entered into a Modification Agreement (the "Modification Agreement") to, among other things, (i) provide for the deposit of 1,000,000 shares (the "Escrow Shares") of our common stock into an escrow account maintained by Northland Securities, Inc., pursuant to an escrow agreement (as further described below), (ii) provide for the issuance to the Investor of a warrant to purchase shares of our common stock upon the release by the Investor of its lien on our property, (iii) amend the payment schedule of the Note to provide (a) for each of the six scheduled payments occurring after the earlier of the effectiveness of a registration statement for the resale of the Registrable Securities (as defined below) or the date that the Registrable Securities may be sold pursuant to Rule 144 under the Securities Act of 1933, as amended (the "Securities Act"), without any information requirements, the amount of principal and interest payable on such date shall be reduced by 50% (the aggregate amount of the six months of such reductions, the "Specified Amount") and (b) if the aggregate amount of payments on the Note applied from the proceeds of the sale of the Escrow Shares on or prior to the last six scheduled payments is less than the Specified Amount (such difference, the "Make Whole Amount"), than the amount of each of the remaining scheduled payments shall be increased by an amount equal to the Make Whole Amount divided by the number of remaining scheduled payments, (iv) modify the Note such that the Note is now convertible into up to 2,500,000 shares (the "Conversion Shares") of our common stock based on a conversion price of $5.00, (v) amend the Note to provide that we will be a direct co-obligor with CloudCo under the Note, and (vi) amend the SPA to allow us to organize or incorporate any subsidiary, over which we shall have voting or beneficial control, which is being formed with the intent to engage in a business or line of business substantially similar to that of Soluna Cloud or the Company, without first paying all of the principal and interest due under the Note and without first obtaining Investor's prior written consent.

The net proceeds from dispositions of the Escrow Shares (i) at a price of up to $4.00 per share shall be applied to reduce the outstanding principal balance of the Note and (ii) at a price greater than $4.00 per share shall be applied first to reduce the outstanding principal balance of the Note in an amount equal to $4.00 per share of our common stock and then to the Investor. The outstanding share numbers in this prospectus do not give effect to the 1,000,000 Escrow Shares to be deposited by the Company in escrow.

Also under the Modification Agreement, we agreed to register for resale the Escrow Shares and Conversion Shares (together, the "Registrable Securities") as promptly as commercially practicable, as determined by us, following the registration for resale of certain other securities. We also agreed to register for resale the shares of our common stock issuable upon exercise of the Warrant as promptly as commercially practicable, as determined by us, after the issuance of the Warrant.

Project Specific Developments

Project Dorothy 2

We are constructing Project Dorothy 2 which is a 48MW expansion of our flagship Project Dorothy that will be dedicated to Bitcoin Hosting. The site is expected to energize soon in the second quarter of 2025. This will enable the commencement of the commissioning of the first of 3 phases, each of 16MW, that will occur between May and October 2025 when the site is expected to be fully operational. As each phase is commissioned, it will begin to generate revenue, both due to Bitcoin Hosting and Demand Response Services.

Project Rosa

We are developing Project Rosa which is expected to be a 187MW data center for AI and Bitcoin hosting and other computing-intensive applications, as well as joint venture potential. It will be co-located with a wind farm in Texas. We have signed term sheets for both power and land purchase agreements in connection with this project.

Project Kati

We are developing Project Kati which is expected to be a 166MW data center for AI, machine learning, Bitcoin hosting and other computing-intensive applications, as well as joint venture potential. It will be co-located with a wind farm in Texas. We have received final ERCOT approval for the Reactive Power Study which is the last study required to exit planning. It is also waiting for required amendments to Las Majadas Wind Farm's agreement with the transmission service provider to be completed.

Project Grace

We continue to develop a 2MW AI/HPC data center to be co-located with the same windfarm as Project Dorothy that will be the first construction of Soluna's proprietary Helix design that remains in the concept design phase.

Project Hedy

We have signed a term sheet for power for Project Hedy, a new 120 MW data center co-located with a 200 MW wind farm in South Texas. The wind farm is owned by a new power partner-a multinational conglomerate that focuses on developing and managing sustainable infrastructure solutions, with a strong emphasis on renewable energy, water management, and services, aiming to contribute to a low-carbon economy and a better planet.

Implications of Being a Smaller Reporting Company

We qualify as a "smaller reporting company" under applicable SEC regulations. A smaller reporting company may take advantage of reduced reporting requirements that are otherwise applicable to public companies. These provisions include, but are not limited to:

●

being permitted to present only two years of audited financial statements and only two years of related "Management's Discussion and Analysis of Financial Condition and Results of Operations" disclosure in our periodic reports and registration statements, including this prospectus; reduced disclosure about our executive compensation arrangements;

●

not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, as amended, on the effectiveness of our internal controls over financial reporting; and

●

reduced disclosure obligations regarding executive compensation arrangements in our periodic reports, proxy statements and registration statements, including this prospectus.

We will continue to be a smaller reporting company as long as we have a public float (determined as of the end of our second fiscal quarter) of less than $250 million or have annual revenues of less than $100 million as of the last fiscal year for which we have audited financial statements and a public float of less than $700 million.

We have elected to take advantage of certain of the reduced disclosure obligations in the registration statement of which this prospectus is a part and may elect to take advantage of other reduced reporting requirements in future filings. As a result, the information that we provide to our stockholders may be different than you might receive from other public reporting companies in which you hold equity interests.

Corporate Information

Soluna Holdings, Inc. ("SHI"), formerly known as Mechanical Technology, Incorporated, which was originally incorporated in the State of New York in 1961, reincorporated in the State of Nevada on March 29, 2021, and is headquartered in Albany, New York. Effective November 2, 2021, the Company changed its name from "Mechanical Technology, Incorporated" (or "MTI") to "Soluna Holdings, Inc." On October 29, 2021, Soluna Callisto Holdings, Inc. merged into Soluna Computing, Inc. ("SCI"), a private green data center development company and a subsidiary of SHI. MTI Instruments, Inc., a subsidiary of SHI, was sold on April 11, 2022. On March 23, 2021, our common stock commenced trading on the Nasdaq Stock Market LLC ("Nasdaq"). We formed a wholly owned subsidiary of SHI on December 27, 2023, Soluna Digital, Inc. ("Soluna Digital," or "SDI"). Effective December 31, 2023, SCI transferred substantially all of its assets to SHI or its subsidiaries, including SDI.

Our principal executive office is located at 325 Washington Avenue Extension, Albany, NY 12205, and our phone number is (516) 216-9257. Our principal website address is www.solunacomputing.com.

Information contained in, or accessible through, our website does not constitute part of this prospectus or registration statement and inclusions of our website address in this prospectus or registration statement are inactive textual references only. You should not rely on any such information in making your decision whether to purchase our securities.

We make available free of charge on or through our website access to press releases and investor presentations, as well as all materials that we file electronically with the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports, filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act of 1934 (the "Exchange Act") as soon as reasonably practicable after electronically filing such materials with, or furnishing them to, the SEC. The SEC maintains an Internet website, www.sec.gov, that contains reports, proxy and information statements and other information that we file electronically with the SEC.

RISK FACTORS

Before purchasing any of the securities you should carefully consider the risk factors incorporated by reference in this prospectus from our most recent Annual Report on Form 10-K and any subsequent updates described in our Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. For a description of these reports and information about where you can find them, see "Additional Information" and "Incorporation of Certain Information By Reference." Additional risks not presently known or that we presently consider to be immaterial could subsequently materially and adversely affect our financial condition, results of operations, business and prospects.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus and the documents incorporated by reference in this prospectus contain, and our officers and representatives may from time to time make, forward-looking statements that involve substantial risks and uncertainties. In some cases, you can identify forward-looking statements by terms such as "may," "will," "should," "expect," "plan," "anticipate," "could," "intend," "target," "project," "estimate," "believe," "estimate," "predict," "potential" or "continue" or the negative of these terms or other similar expressions intended to identify statements about the future. These statements speak only as of the date of this prospectus and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements include, without limitation, statements about the following:

●	the availability of financing opportunities, risks associated with economic conditions, dependence on management and conflicts of interest;
●	the ability to service debt obligations and maintain flexibility in respect of debt covenants;
●	economic dependence on regulated terms of service and electricity rates;
●	the speculative and competitive nature of the technology sector;
●	our ability to attract and retain hosted customers for our hosting operations;
●	dependency in continued growth in blockchain and cryptocurrency usage;

●	lawsuits and other legal proceedings and challenges;
●	conflict of interests with directors and management;
●	government regulations;
●	our ability to construct and complete the anticipated expansion of our data centers; and
●	other factors beyond our control.

The foregoing does not represent an exhaustive list of matters that may be covered by the forward-looking statements contained herein and in the documents incorporated by reference herein or risk factors that we are faced with that may cause our actual results to differ from those anticipate in our forward-looking statements. Factors that may affect our results include, but are not limited to, the risks and uncertainties discussed in the "Risk Factors" section on page 8 of this prospectus, in our most recent Annual Report on Form 10-K or in other reports we file with the SEC.

Moreover, new risks regularly emerge, and it is not possible for our management to predict or articulate all risks we face, nor can we assess the impact of all risks on our business or the extent to which any risk, or combination of risks, may cause actual results to differ from those contained in any forward-looking statements. The Private Securities Litigation Reform Act of 1995 and Section 27A of the Securities Act do not protect any forward-looking statements that we make in connection with this offering. All forward-looking statements included in this prospectus and in the documents incorporated by reference in this prospectus are based on information available to us on the date of this prospectus or the date of the applicable document incorporated by reference. Except to the extent required by applicable laws or rules, we undertake no obligation to publicly update or revise any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained above and throughout this prospectus and in the documents incorporated by reference in this prospectus. We qualify all of our forward-looking statements by these cautionary statements.

You should rely only on the information in this prospectus. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely upon it.

USE OF PROCEEDS

Unless we inform you otherwise in the prospectus supplement, we will use the net proceeds from the sale of the securities offered by this prospectus and the exercise price from the exercise of any convertible securities, if any, for working capital and general corporate purposes.

When particular securities are offered, the prospectus supplement relating to that offering will set forth our intended use of the net proceeds received from the sale of those securities we sell. Pending the application of the net proceeds for these purposes, we expect to invest the proceeds in short-term, interest-bearing instruments or other investment-grade securities.

THE SECURITIES WE MAY OFFER

The descriptions of the securities contained in this prospectus, together with the applicable prospectus supplements, summarize all of the material terms and provisions of the various types of securities that we may offer. We will describe in the applicable prospectus supplement relating to any securities the particular terms of the securities offered by that prospectus supplement. If we indicate in the applicable prospectus supplement, the terms of the securities may differ from the terms we have summarized below. We may also include in the prospectus supplement information about material United States federal income tax considerations relating to the securities, and the securities exchange, if any, on which the securities will be listed.

We may sell from time to time, in one or more offerings:

●	common stock;
●	preferred stock;
●	warrants to purchase shares of common stock or preferred stock;
●	debt securities;
●	subscription rights to purchase shares of common stock, preferred stock or debt securities; and
●	units consisting of any combination of the securities listed above.

In this prospectus, we refer to the common stock, preferred stock, debt securities, subscription rights, warrants and units collectively as "securities." The total dollar amount of all securities that we may sell will not exceed $100,000,000.

If we issue debt securities at a discount from their original stated principal amount, then, for purposes of calculating the total dollar amount of all securities issued under this prospectus, we will treat the initial offering price of the debt securities as the total original principal amount of the debt securities.

This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

DESCRIPTION OF CAPITAL STOCK

We have authorized capital stock consisting of 75,000,000 shares of common stock and 10,000,000 shares of preferred stock, par value $0.001 per share, of which 6,040,000 shares have been designated as shares of Series A Preferred Stock and 187,500 have been designated as Series B Convertible Preferred Stock, par value $0.001 per share ("Series B Preferred Stock"), as of April 18, 2025. As of April 17, 2025, we had 12,508,045 shares of common stock issued and outstanding, 4,953,545 shares of Series A Preferred Stock issued and outstanding, and 62,500 shares of Series B Preferred Stock issued and outstanding. Unless stated otherwise, the following discussion summarizes the term and provisions of our articles of incorporation, as amended (the "Articles of Incorporation"), and our bylaws (the "Bylaws"). This description is summarized from, and qualified in its entirety by reference to, our Articles of Incorporation (including the certificate of designation for our Series A Preferred Stock, as amended (the "Series A COD"), and the certificate of designation for the Series B Preferred Stock, as amended (the "Series B COD")) and our Bylaws, which are filed as exhibits to the registration statement of which this prospectus forms a part, and the applicable provisions of the Nevada Revised Statutes, as amended (the "NRS").

General

Our Articles of Incorporation authorizes us to issue up to 85,000,000 shares of stock, consisting of 75,000,000 shares of common stock and 10,000,000 shares of preferred stock, of which 6,040,000 shares have been designated as Series A Preferred Stock and 187,500 have been designated as Series B Preferred Stock, as of April 18, 2025.

Under our Articles of Incorporation, our Board, without stockholder approval, is authorized to provide for the issuance of shares of common stock or preferred stock in one or more classes or series, to establish the number of shares in each class or series, and to fix the terms thereof.

Common Stock

Voting rights. The holders of our common stock are entitled to one vote per share held on all matters on which a vote of our common stockholders is taken. Stockholders do not have cumulative voting rights in the election of directors. The election of directors of the Company is decided by plurality vote and all other questions are decided by a majority of the votes cast by our stockholders present in person or by proxy, except as otherwise required by the NRS or our Articles of Incorporation. Our Articles of Incorporation provide that notwithstanding any other provision of our Articles of Incorporation or our Bylaws (and notwithstanding the fact that some lesser percentage may be specified by law, the Articles of Incorporation, or the Bylaws), any director or the entire Board may be removed at any time, but only for cause upon the affirmative vote of 75% or more of the outstanding shares of capital stock entitled to vote for the election of directors at a meeting called for that purpose.

The Board is divided into three classes, with each class consisting, as nearly as may be possible, of one-third of the total number of directors, with the terms of the classes scheduled to expire in successive years. At each annual meeting of the Company's stockholders, the stockholders elect the members of a single class of directors for three-year terms.

Dividends. The holders of our common stock are entitled to receive dividends when, as, and if declared by the Board, out of funds legally available therefor.

Liquidation. Except as otherwise provided under our Articles of Incorporation (including the terms of any preferred stock), upon liquidation, dissolution, or the winding up of the Company, holders of our common stock are entitled to receive any remaining assets of the Company in proportion to the respective number of shares held after payment of and reservation for Company liabilities.

Preemptive Rights. The holders of shares of our common stock do not have any preemptive right to subscribe for or purchase any shares of any class or series of our capital stock.

Redemption Rights. The outstanding shares of common stock are not subject to redemption by the Company. To the extent that the Company issues additional shares of common stock, the relative interest in the Company of existing stockholders will likely be diluted.

Preferred Stock

Our Articles of Incorporation authorize the Board, without obtaining stockholder approval, to issue up to 10,000,000 shares of preferred stock, from time to time, in one or more series, and to fix the number of shares and determine for each such series such voting powers, designations, preferences, and relative participating, optional, or other rights and such qualifications, limitations, or restrictions thereof. The Board is also expressly authorized to increase or decrease (but not below the number of such series then outstanding) the number of shares of any series subsequent to the issuance of shares of that series. If the number of shares of any series is decreased, the shares no longer designated as shares of such series will resume the status of "blank check" preferred stock and may be designated, again, as a new series of preferred stock by the Board.

As of April 18, 2025, 6,040,000 shares of our preferred stock were designated as shares of Series A Preferred Stock and 187,500 shares were designated as Series B Preferred Stock. Unless the applicable prospectus supplement indicates otherwise, we will have the right to "reopen" a previous issue of a series of preferred stock by issuing additional preferred stock of such series.

Series A Preferred Stock

The following is a summary of some general terms and provisions of our Series A Preferred Stock. Because it is a summary, it does not contain all of the information that may be important to you. If you want more information, you should read our Articles of Incorporation (including the Series A COD and Series B COD) and Bylaws, copies of which are filed as exhibits to this prospectus.

Voting Rights. Holders of the Series A Preferred Stock do not have any voting rights, except as described below or as otherwise required by law. In any matter in which the Series A Preferred Stock may vote (as expressly provided in the Series A COD or as may be required by law), each share of Series A Preferred Stock will be entitled to one vote per $25.00 of liquidation preference; provided that if the Series A Preferred Stock and any other stock ranking on parity to the Series A Preferred Stock as to dividend rights and rights as to the distribution of assets upon the Company's liquidation, dissolution or winding up are entitled to vote together as a single class on any matter, the holders of each will vote in proportion to their respective liquidation preferences.

Dividends. Subject to the preferential rights, if any, of the holders of any class or series of capital stock of the Company ranking senior to the Series A Preferred Stock as to dividends, the holders of the Series A Preferred Stock are entitled to receive, when, as and if declared by the Board (or a duly authorized committee of the Board), only out of funds legally available for the payment of dividends, cumulative cash dividends at the annual rate of 9.0% of the $25.00 liquidation preference per year (equivalent to $2.25 per year).

Liquidation. In the event of the voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Company, holders of shares of Series A Preferred Stock will be entitled to be paid out of the assets of the Company legally available for distribution to its stockholders (i.e., after satisfaction of all the Company's liabilities to creditors, if any) and, subject to the rights of holders of any shares of each other class or series of capital stock ranking, as to rights to the distribution of assets upon the Company's voluntary or involuntary liquidation, dissolution or winding up, senior to the Series A Preferred Stock, a liquidation preference of $25.00 per share, plus an amount equal to any accumulated and unpaid dividends to the date of payment (whether or not declared), before any distribution or payment may be made to holders of shares of our common stock or any other class or series of the Company's capital stock ranking, as to rights to the distribution of assets upon any voluntary or involuntary liquidation, dissolution or winding up, junior to the Series A Preferred Stock (the "liquidation preference").

If, upon such voluntary or involuntary liquidation, dissolution or winding up of the Company's affairs, the assets of the Company legally available for distribution to the Company's stockholders are insufficient to pay the full amount of the liquidation preference on all outstanding shares of Series A Preferred Stock and the corresponding amounts payable on all shares of each other class or series of capital stock of the Company ranking, as to rights to the distribution of assets upon any voluntary or involuntary liquidation, dissolution or winding up, on parity with the Series A Preferred Stock, then the holders of the Series A Preferred Stock and each such other class or series of capital stock of the Company ranking, as to rights to the distribution of assets upon the Company's voluntary or involuntary liquidation, dissolution or winding up, on parity with the Series A Preferred Stock will share ratably in any distribution of assets in proportion to the full liquidation preference to which they would otherwise be respectively entitled.

Preemptive Rights. Holders of Series A Preferred Stock do not, as holders of Series A Preferred Stock, have any preemptive rights to purchase or subscribe for our common stock or any other security of the Company.

Redemption Rights. The Company is not required to redeem the Series A Preferred Stock at any time. The Series A Preferred Stock is perpetual and has no maturity date. On or after August 26, 2025, the Series A Preferred Stock may be redeemed at the Company's option, in whole or in part, from time to time, at a redemption price of $25.00 per share, plus all dividends accumulated and unpaid (whether or not declared) on the Series A Preferred Stock up to, but not including, the date of such redemption. The Company also has a special optional right to redeem the Series A Preferred Stock, by paying a redemption price of $25.00 per share, plus all dividends accumulated and unpaid(whether or not declared) on the Series A Preferred Stock up to, but not including, the date of such redemption, if a Delisting Event or Change of Control (each as defined in the Series A COD) occurs. The Series A Preferred Stock is not subject to any sinking fund.

Conversion Rights. The shares of Series A Preferred Stock are not convertible into or exchangeable for any other property or securities of the Company or any other entity, except upon the occurrence of a Delisting Event or Change of Control (each as defined in the Series A COD), in which case (unless the Company has already elected to redeem such shares), shares of Series A Preferred Stock are convertible into shares of our common stock (or equivalent value of alternative consideration), as calculated pursuant to the terms of the Series A COD.

Ranking. The Series A Preferred Stock will, as to dividend rights and rights as to the distribution of assets upon the Company's liquidation, dissolution or winding up, rank: (1) senior to all classes or series of our common stock and to all other capital stock issued by the Company expressly designated as ranking junior to the Series A Preferred Stock, (2) on parity with any future class or series of the Company's capital stock expressly designated as ranking on parity with the Series A Preferred Stock; (3) junior to any future class or series of the Company capital stock expressly designated as ranking senior to the Series A Preferred Stock; and (4) junior to all the Company's existing and future indebtedness (including subordinated indebtedness and any indebtedness convertible into common stock or preferred stock) and other liabilities with respect to assets available to satisfy claims against the Company and structurally subordinated to the indebtedness and other liabilities of (as well as any preferred equity interests held by others in) existing or future subsidiaries of the Company. The Company may issue junior capital stock and parity capital stock, as described above, at any time and from time to time in one or more series without the consent of the holders of the Series A Preferred Stock. The Company may not issue any senior capital stock, as described above, without the consent or affirmative vote of the holders of at least two-thirds of the outstanding shares of Series A Preferred Stock and each other class or series of our preferred stock entitled to vote thereon, voting as a single class.

Series B Preferred Stock

The following is a summary of some general terms and provisions of our Series B Preferred Stock. Because it is a summary, it does not contain all of the information that may be important to you. If you want more information, you should read our Articles of Incorporation (including the Series A COD and Series B COD) and Bylaws, copies of which are filed as exhibits to this prospectus.

Redemption Rights. The Series B Preferred Stock is perpetual and has no maturity date. Provided that no shares of Series A Preferred Stock are outstanding, either the Company or the holder may, at its option, at any time on or after the later of (i) the third anniversary of the Original Issue Date and (ii) Note Release Date (each as defined in the Series B COD and together, the "Redemption Date"), if all of the shares of Series B Preferred Stock have not been converted to shares of common stock prior to the Redemption Date, redeem the outstanding shares of Series B Preferred Stock, in whole or in part, at any time after the Redemption Date, at a cash redemption price per share of Series B Preferred Stock equal to the Stated Value, or $100.00. In the event that our common stock ceases to trade on a national exchange for twenty consecutive Trading Days, if at least a majority of the holders so elect, they may present the Company with a Notice of Redemption. The Series B Preferred Stock is not subject to any mandatory redemption, sinking fund or other similar provisions.

Conversion Rights. Each share of Series B Preferred Stock shall be convertible, at any time and from time to time on or after the later of a date that is (i) 180 days after the Original Issue Date (as defined in the Series B COD) or (ii) the date on which those certain senior secured convertible notes in the original aggregate principal amount of $16,304,348 that were issued on or about October 25, 2021 have been fully redeemed, defeased, or converted, at the option of the holder thereof, into that number of shares of our common stock determined by dividing the Stated Value of such share of Series B Preferred Stock by the Conversion Price (as defined below). Holders shall also be paid any accrued and unpaid cash dividends and/or issued shares of our common stock, if dividends are payable in shares of our common stock, based on the applicable rate of conversion, at the same time such shares are issued to the holders. If a Fundamental Transaction (as defined in the Series B COD) occurs, then immediately prior to the closing of such Fundamental Transaction, each share of Series B Preferred Stock shall, without further action from the holder thereof, automatically convert into common stock at the then effective conversion rate, without regard to any beneficial ownership limitation under the Series B COD.

Conversion Price. The conversion price for the Series B Preferred Stock shall equal $5.00 (the "Conversion Price"), subject to adjustment for reverse and forward stock splits, stock dividends, stock combinations and other similar transactions of our common stock that occur after the First Amendment Effective Date (as defined in the Series B COD). The Conversion Price shall be subject to adjustment on the Lockup Expiration Date (as defined in the Series B COD) as follows: the lowest of (a) $5.00; (b) the closing price of our common stock on the Trading Day immediately preceding the Lockup Expiration Date, as quoted on a Trading Market; or (c) 90% of the average VWAP for the five Trading Days preceding the Lockup Expiration Date. The Conversion Price shall be rounded down to the nearest $0.01.

Dividends. Holders of Series B Preferred Stock shall be entitled to receive, and the Company shall pay, by issuing shares of our common stock (or cash at the Company's option) to such holders, dividends on shares of Series B Preferred Stock, based on the Stated Value, at a rate of ten percent (10%) per annum, commencing on the Original Issue Date (as defined in the Series B COD) until the date that such share of Series B Preferred Stock is converted to common stock or otherwise redeemed (the "Dividend Termination Date"). Such dividends shall accrue and be compounded daily on the basis of a 360-day day year and twelve 30-day months and shall be paid annually on each anniversary of the Original Issue Date (or within five (business days thereof) and, in the event that shares of Series B Preferred Stock are converted to common stock or otherwise redeemed, on the Dividend Termination Date (or within five (5) business days thereof). No other dividends shall be paid on shares of Series B Preferred Stock.

Voting Rights. Series B Preferred Stock will vote with the shares of common stock, on an as-converted to common stock basis, with respect to all matters on which the holders of common stock are entitled to vote, provided, that no holder (together with such holder's Affiliates and Attribution Parties (each as defined in the Series B COD) shall be entitled to vote an amount of shares of common stock (including Series B Preferred Stock on as an-converted to common stock basis) in excess of the Beneficial Ownership Limitation (as defined in the Series B COD), with any remaining amount of shares held by such holder, its Affiliates and Attribution Parties deemed non-voting. In addition, as long as any shares of Series B Preferred Stock are outstanding, the Company shall not, without the affirmative vote of the holders of a majority of the then outstanding shares of the Series B Preferred Stock, (a) alter or change adversely the powers, preferences or rights given to the Series B Preferred Stock or alter or amend the Series B COD, (b) amend its Articles of Incorporation or other charter documents in any manner that adversely affects any rights of the holders, (c) increase the number of authorized shares of preferred stock, or (d) enter into any agreement with respect to any of the foregoing.

Liquidation Rights. Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary (a "Liquidation"), the holders of Series B Preferred Stock shall be entitled to receive out of the assets, whether capital or surplus, of the Company the greater of the following amounts:

(a) the aggregate Stated Value of such holder's shares of Series B Preferred Stock; or

(b) the amount the holder would be entitled to receive if the Series B Preferred Stock were fully converted (disregarding for such purposes any conversion limitations hereunder) to common stock, which amounts shall be paid pari passu with all holders of common stock.

In addition, in the case of either (a) or (b) above, the holders will be entitled to the payment of all accrued and unpaid dividends on the Series B Preferred Stock and, in the event any of such dividends are payable in shares of common stock, the cash value of such shares of common stock upon Liquidation. The Company shall mail written notice of any such Liquidation, not less than forty-five (45) days prior to the payment date stated therein, to each holder.

Ranking. Except to the extent that the holders of at least a majority of the outstanding Series B Preferred Stock (the "Required Holders") expressly consent to the creation of Parity Stock (as defined below) or Senior Preferred Stock (as defined below), all shares of common stock and all shares of capital stock of the Company authorized or designated after the date of the designation of the Series B Preferred Stock shall be junior in rank to the Series B Preferred Stock with respect to the preferences as to dividends, distributions and payments upon the liquidation, dissolution and winding up of the Company (such junior stock collectively, "Junior Stock"). Without limiting any other provision of the Series B COD, without the prior express consent of the Required Holders, voting separate as a single class, the Company shall not hereafter authorize or issue any additional or other shares of capital stock that is (i) of senior rank to the Series B Preferred Stock in respect of the preferences as to dividends, distributions and payments upon the liquidation, dissolution and winding up of the Company (collectively, "Senior Preferred Stock"); provided, however, that the Series B Preferred Stock shall be pari passu to the Series A Preferred Stock, including any Series A Preferred Stock that shall be issued subsequent to the designation of the Series B Preferred Stock, or (ii) of pari passu rank to the Series B Preferred Stock in respect of the preferences as to dividends, distributions and payments upon the liquidation, dissolution and winding up of the Company (collectively, the "Parity Stock").

Terms of the Preferred Stock That We May Offer and Sell to You

We summarize below some of the provisions that will apply to the preferred stock that we may offer to you unless the applicable prospectus supplement provides otherwise. This summary may not contain all information that is important to you. You should read the prospectus supplement, which will contain additional information and which may update or change some of the information below. Prior to the issuance of a new series of preferred stock, we will further amend our articles of incorporation, as amended, by filing a certificate of designation designating the stock of that series and the terms of that series. We will file a copy of the certificate of designation that contains the terms of each new series of preferred stock with the Nevada Secretary of State and the SEC each time we issue a new series of preferred stock. Each certificate of designation will establish the number of shares included in a designated series and fix the designation, powers, privileges, preferences and rights of the shares of each series as well as any applicable qualifications, limitations or restrictions. You should refer to the applicable certificate of designation as well as our articles of incorporation, as amended, before deciding to buy shares of our preferred stock as described in the applicable prospectus supplement.

Our board of directors has the authority, without further action by the stockholders, to issue preferred stock in one or more series and to fix the number of shares, dividend rights, conversion rights, voting rights, redemption rights, liquidation preferences, sinking funds, and any other rights, preferences, privileges and restrictions applicable to each such series of preferred stock. The issuance of any preferred stock could adversely affect the rights of the holders of common stock and, therefore, reduce the value of the common stock. The ability of our board of directors to issue preferred stock could discourage, delay or prevent a takeover or other corporate action. The terms of any particular series of preferred stock will be described in the prospectus supplement relating to that particular series of preferred stock, including, where applicable:

	●	the designation, stated value and liquidation preference of such preferred stock;
	●	the number of shares within the series;
	●	the offering price;
	●	the dividend rate or rates (or method of calculation), the date or dates from which dividends shall accrue, and whether such dividends shall be cumulative or noncumulative and, if cumulative, the dates from which dividends shall commence to cumulate;
	●	any redemption or sinking fund provisions;
	●	the amount that shares of such series shall be entitled to receive in the event of our liquidation, dissolution or winding-up;
	●	the terms and conditions, if any, on which shares of such series shall be convertible or exchangeable for shares of our stock of any other class or classes, or other series of the same class;
	●	the voting rights, if any, of shares of such series; the status as to reissuance or sale of shares of such series redeemed, purchased or otherwise reacquired, or surrendered to us on conversion or exchange;
	●	the conditions and restrictions, if any, on the payment of dividends or on the making of other distributions on, or the purchase, redemption or other acquisition by us or any subsidiary, of the common stock or of any other class of our shares ranking junior to the shares of such series as to dividends or upon liquidation;
	●	the conditions and restrictions, if any, on the creation of indebtedness by us or by any subsidiary, or on the issuance of any additional stock ranking on a parity with or prior to the shares of such series as to dividends or upon liquidation; and
	●	any additional dividend, liquidation, redemption, sinking or retirement fund and other rights, preferences, privileges, limitations and restrictions of such preferred stock.

Anti-Takeover Effects of Certain Provisions of Our Articles of Incorporation and Bylaws, and Nevada Law

Our Articles of Incorporation and Bylaws contain provisions and terms that may delay, defer, or prevent a tender offer or change in control of the Company that a stockholder might consider to be in his, her, or its best interests, including attempts that might result in a premium being paid over the market price for shares of our Common Stock. The Company expects that such provisions and terms may have the effect of discouraging extraordinary corporate transactions with respect to the Company, such as hostile takeover bids, and will instead encourage any potential acquiror of the Company to first correspond with our Board. These provisions and terms include:

	●	Special meetings of stockholders may only be called by the by the chairman of the board or the chief executive officer, or, if there be no chairman of the board and no chief executive officer, by the president, and shall be called by the secretary upon the written request of at least a majority of the Board or the holders of not less than a majority of the voting power of the Company's stock entitled to vote.
	●	The Company maintains a classified Board that is divided into three classes serving for respective three-year terms. As a result, it would take at least two successive annual meetings of shareholders to replace a majority of the members of our Board.
	●	Vacancies on the Board may be filled by majority vote of remaining directors then in office, even if less than a quorum, with the individual elected to serve for the remainder of the unexpired term.
	●	Any director of the Company may be removed from service as a director only after the affirmative vote of 75% or more of outstanding shares of stock entitled to vote for the election of directors, at a meeting called for that purpose.

Nevada's "combinations with interested stockholders" statutes, NRS 78.411 through 78.444, inclusive, prohibit specified types of business "combinations" between certain Nevada corporations and any person deemed to be an "interested stockholder" for two years after such person first becomes an "interested stockholder" unless the corporation's board of directors approves the combination (or the transaction by which such person becomes an "interested stockholder") in advance, or unless the combination is approved by the board of directors and sixty percent of the corporation's voting power not beneficially owned by the interested stockholder, its affiliates and associates. Further, in the absence of prior approval certain restrictions may apply even after such two year period. However, these statutes do not apply to any combination of a corporation and an interested stockholder after the expiration of four years after the person first became an interested stockholder. For purposes of these statutes, an "interested stockholder" is any person who is (1) the beneficial owner, directly or indirectly, of ten percent or more of the voting power of the outstanding voting shares of the corporation, or (2) an affiliate or associate of the corporation and at any time within the two previous years was the beneficial owner, directly or indirectly, of ten percent or more of the voting power of the then outstanding shares of the corporation. The definition of the term "combination" is sufficiently broad to cover most significant transactions between a corporation and an "interested stockholder." These statutes generally apply to Nevada corporations with 200 or more stockholders of record. However, a Nevada corporation may elect in its articles of incorporation not to be governed by these particular laws, but if such election is not made in the corporation's original articles of incorporation, the amendment (1) must be approved by the affirmative vote of the holders of stock representing a majority of the outstanding voting power of the corporation not beneficially owned by interested stockholders or their affiliates and associates, and (2) is not effective until 18 months after the vote approving the amendment and does not apply to any combination with a person who first became an interested stockholder on or before the effective date of the amendment. We made an election to opt out of these statutes in our original articles of incorporation and have not amended such provision.

Nevada's "acquisition of controlling interest" statutes (NRS 78.378 through 78.3793, inclusive) contain provisions governing the acquisition of a controlling interest in certain Nevada corporations. These "control share" laws provide generally that any person that acquires a "controlling interest" in certain Nevada corporations may be denied voting rights, unless a majority of the disinterested stockholders of the corporation elect to restore such voting rights. These laws will apply to us as of a particular date if we were to have 200 or more stockholders of record (at least 100 of whom have addresses in Nevada appearing on our stock ledger at all times during the 90 days immediately preceding that date) and do business in the State of Nevada directly or through an affiliated corporation, unless our Articles of Incorporation or Bylaws in effect on the tenth day after the acquisition of a controlling interest provide otherwise. These laws provide that a person acquires a "controlling interest" whenever a person acquires shares of a subject corporation that, but for the application of these provisions of the NRS, would enable that person to exercise (1) one-fifth or more, but less than one-third, (2) one-third or more, but less than a majority, or (3) a majority or more of all of the voting power of the corporation in the election of directors. Once an acquirer crosses one of these thresholds, shares which it acquired in the transaction taking it over the threshold and within the 90 days immediately preceding the date when the acquiring person acquired or offered to acquire a controlling interest become "control shares" to which the voting restrictions described above apply. These laws may have a chilling effect on certain transactions if our Articles of Incorporation or Bylaws are not timely amended to provide that these provisions do not apply to us or to an acquisition of a controlling interest, or if our disinterested stockholders do not confer voting rights in the control shares.

Further, NRS 78.139 provides that directors may resist a change or potential change in control of a corporation if the board of directors determines that the change or potential change in control is opposed to or not in the best interest of the corporation upon consideration of any relevant facts, circumstances, contingencies or constituencies pursuant to NRS 78.138(4).

We expect the existence of these provisions may have an anti-takeover effect with respect to transactions that our Board does not approve in advance and could result in making it more difficult to accomplish transactions that our stockholders may see as beneficial such as (i) discouraging business combinations that might result in a premium over the market price for the shares of our Common Stock; (ii) discouraging hostile takeovers which could inhibit temporary fluctuations in the market price of our Common Stock that often result from actual or rumored hostile takeover attempts; and (iii) preventing changes in our management.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock, Series A Preferred Stock and Series B Preferred Stock is Equiniti Trust Company, LLC (the "Transfer Agent") (formerly: American Stock Transfer & Trust Company, LLC). The Transfer Agent's address is 48 Wall Street, 23rd Floor, New York, NY 10005. The transfer agent and registrar for any additional series or class of preferred stock, if any, will be set forth in each applicable prospectus supplement.

DESCRIPTION OF WARRANTS

We summarize below some of the provisions that will apply to the warrants unless the applicable prospectus supplement provides otherwise. This summary may not contain all information that is important to you. The complete terms of the warrants will be contained in the applicable warrant certificate and warrant agreement. These documents have been or will be included or incorporated by reference as exhibits to the registration statement of which this prospectus is a part. You should read the warrant certificate and the warrant agreement. You should also read the prospectus supplement, which will contain additional information and which may update or change some of the information below.

General

We may issue warrants to purchase our debt or equity securities or securities of third parties or other rights, including rights to receive payment in cash or securities based on the value, rate or price of one or more specified commodities, currencies, securities or indices, or any combination of the foregoing. Warrants may be issued independently or together with any other securities and may be attached to, or separate from, such securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank, trust company or other financial institution, as warrant agent, or we may issue warrants directly to investors. A description of the terms and material provisions of any warrants we may issue will be set forth in the applicable prospectus supplement.

The applicable prospectus supplement will describe the following terms of any warrants in respect of which this prospectus is being delivered:

●	the title of such warrants;
●	the aggregate number of such warrants;
●	the price or prices at which such warrants will be issued;
●	the currency or currencies in which the price of such warrants will be payable;
●	the securities or other rights, including rights to receive payment in cash or securities based on the value, rate or price of one or more specified commodities, currencies, securities or indices, or any combination of the foregoing, purchasable upon exercise of such warrants;
●	the price at which and the currency or currencies in which the securities or other rights purchasable upon exercise of such warrants may be purchased;
●	the date on which the right to exercise such warrants shall commence and the date on which such right shall expire;
●	if applicable, the minimum or maximum amount of such warrants which may be exercised at any one time;
●	provision for changes to or adjustments in the exercise price of such warrants, if any;
●	if applicable, the designation and terms of the securities with which such warrants are issued and the number of such warrants issued with each such security;
●	if applicable, the date on and after which such warrants and the related securities will be separately transferable;
●	information with respect to book-entry procedures, if any;
●	if applicable, a discussion of any material United States Federal income tax or foreign income tax considerations; and
●	any other terms of such warrants, including terms, procedures and limitations relating to the exchange and exercise of such warrants.

Transfer Agent and Registrar

The transfer agent and registrar, if any, for any warrants will be set forth in the applicable prospectus supplement.

DESCRIPTION OF DEBT SECURITIES

This prospectus describes certain general terms and provisions of debt securities that we may offer. The debt securities may be issued pursuant to, in the case of senior debt securities, a senior indenture, and in the case of subordinated debt securities, a subordinated indenture, in each case in the forms filed as exhibits to this registration statement, which we refer to as the "indentures." The indentures will be entered into between us and a trustee to be named prior to the issuance of any debt securities, which we refer to as the "trustee." The indentures will not limit the amount of debt securities that can be issued thereunder and will provide that the debt securities may be issued from time to time in one or more series pursuant to the terms of one or more securities resolutions or supplemental indentures creating such series.

We have summarized below the material provisions of the indentures and the debt securities or indicated which material provisions will be described in the related prospectus supplement for any offering of debt securities. These descriptions are only summaries, and you should refer to the relevant indenture for the particular offering of debt securities itself which will describe completely the terms and definitions of the offered debt securities and contain additional information about the debt securities.

All references in this section, "Description of Debt Securities," to "Soluna," the "Company", "we", "us", "our", the "registrant" or similar words are solely to Soluna Holdings, Inc., and not to its subsidiaries.

Terms

When we offer to sell a particular series of debt securities, we will describe the specific terms of the securities in a prospectus supplement. The prospectus supplement will set forth the following terms, as applicable, of the debt securities offered thereby:

●	the designation, aggregate principal amount, currency or composite currency and denominations;
●	the price at which such debt securities will be issued and, if an index formula or other method is used, the method for determining amounts of principal or interest;
●	the maturity date and other dates, if any, on which principal will be payable;
●	whether or not the debt securities will be secured or unsecured, and the terms of any secured debt;
●	whether the debt securities rank as senior debt, senior subordinated debt, subordinated debt or any combination thereof, and the terms of any subordination;
●	the interest rate (which may be fixed or variable), if any;
●	the date or dates from which interest will accrue and on which interest will be payable, and the record dates for the payment of interest;
●	the manner of paying principal and interest;
●	the place or places where principal and interest will be payable;
●	the terms of any mandatory or optional redemption by us or any third party including any sinking fund;
●	the terms of any conversion or exchange;
●	the terms of any redemption at the option of holders or put by the holders;
●	any tax indemnity provisions;
●	if the debt securities provide that payments of principal or interest may be made in a currency other than that in which the debt securities are denominated, the manner for determining such payments;
●	the portion of principal payable upon acceleration of a Discounted Debt Security (as defined below);
●	whether and upon what terms debt securities may be defeased;
●	any events of default or covenants in addition to or in lieu of those set forth in the indentures;
●	provisions for electronic issuance of debt securities or for the issuance of debt securities in uncertificated form; and
●	any additional provisions or other special terms not inconsistent with the provisions of the indentures, including any terms that may be required or advisable under United States or other applicable laws or regulations, or advisable in connection with the marketing of the debt securities.

Debt securities of any series may be issued as registered debt securities or uncertificated debt securities, in such denominations as specified in the terms of the series.

Securities may be issued under the indentures as Discounted Debt Securities to be offered and sold at a substantial discount from the principal amount thereof. Special United States federal income tax and other considerations applicable thereto will be described in the prospectus supplement relating to such Discounted Debt Securities. "Discounted Debt Security" means a security where the amount of principal due upon acceleration is less than the stated principal amount.

We are not obligated to issue all debt securities of one series at the same time and, unless otherwise provided in the prospectus supplement, we may reopen a series, without the consent of the holders of the debt securities of that series, for the issuance of additional debt securities of that series. Additional debt securities of a particular series will have the same terms and conditions as outstanding debt securities of such series, except for the date of original issuance and the offering price, and will be consolidated with, and form a single series with, such outstanding debt securities.

Ranking

The senior debt securities will rank equally with all of our other senior and unsubordinated debt. Our secured debt, if any, will be effectively senior to the senior debt securities to the extent of the value of the assets securing such debt. The subordinated debt securities will be subordinate and junior in right of payment to all of our present and future senior indebtedness to the extent and in the manner described in the prospectus supplement and as set forth in the board resolution, officer's certificate or supplemental indenture relating to such offering.

We have only a stockholder's claim on the assets of our subsidiaries. This stockholder's claim is junior to the claims that creditors of our subsidiaries have against our subsidiaries. Holders of our debt securities will be our creditors and not creditors of any of our subsidiaries. As a result, all the existing and future liabilities of our subsidiaries, including any claims of their creditors, will effectively be senior to the debt securities with respect to the assets of our subsidiaries. In addition, to the extent that we issue any secured debt, the debt securities will be effectively subordinated to such secured debt to the extent of the value of the assets securing such secured debt.

The debt securities will be obligations exclusively of Soluna Holdings, Inc. To the extent that our ability to service our debt, including the debt securities, may be dependent upon the earnings of our subsidiaries, our ability to do so will be dependent on the ability of our subsidiaries to distribute those earnings to us as dividends, loans or other payments.

Certain Covenants

Any covenants that may apply to a particular series of debt securities will be described in the prospectus supplement relating thereto.

Successor Obligor

The indentures provide that, unless otherwise specified in the securities resolution or supplemental indenture establishing a series of debt securities, we shall not consolidate with or merge into, or transfer all or substantially all of our assets to, any person in any transaction in which we are not the survivor, unless:

●	the person is organized under the laws of the United States or a jurisdiction within the United States;
●	the person assumes by supplemental indenture all of our obligations under the relevant indenture, the debt securities and any coupons;
●	immediately after the transaction no Default (as defined below) exists; and
●	we deliver to the trustee an officers' certificate and opinion of counsel stating that the transaction complies with the foregoing requirements and that all conditions precedent provided for in the indenture relating to the transaction have been complied with.

In such event, the successor will be substituted for us, and thereafter all of our obligations under the relevant indenture, the debt securities and any coupons will terminate.

The indentures provide that these limitations shall not apply if our Board makes a good faith determination that the principal purpose of the transaction is to change our state of incorporation.

Exchange of Debt Securities

Registered debt securities may be exchanged for an equal aggregate principal amount of registered debt securities of the same series and date of maturity in such authorized denominations as may be requested upon surrender of the registered debt securities at an agency of the Company maintained for such purpose and upon fulfillment of all other requirements of such agent.

Default and Remedies

Unless the securities resolution or supplemental indenture establishing the series otherwise provides (in which event the prospectus supplement will so state), an "Event of Default" with respect to a series of debt securities will occur if:

(1)	we default in any payment of interest on any debt securities of such series when the same becomes due and payable and the default continues for a period of 30 days;

(2)	we default in the payment of all or any part of the principal and premium, if any, of any debt securities of such series when the same becomes due and payable at maturity or upon redemption, acceleration or otherwise and such default shall continue for five or more days;

(3)	we default in the performance of any of our other agreements applicable to the series and the default continues for 30 days after the notice specified below;

(4)	a court of competent jurisdiction enters an order or decree under any Bankruptcy Law (as defined below) that:

	(A)	is for relief against us in an involuntary case,
	(B)	appoints a Custodian (as defined below) for us or for any substantial part of our property, or
	(C)	orders the winding up or liquidation of us, and the order or decree remains unstayed and in effect for 90 consecutive days;

(5)	we, pursuant to or within the meaning of any Bankruptcy Law:

	(A)	commence a voluntary case,
	(B)	consent to the entry of an order for relief against us in an involuntary case,
	(C)	consent to the appointment of a Custodian for us or for any substantial part of our property, or
	(D)	make a general assignment for the benefit of our creditors; or

(6)	there occurs any other Event of Default provided for in such series.

The term "Bankruptcy Law" means Title 11 of the United States Code or any similar Federal or State law for the relief of debtors. The term "Custodian" means any receiver, trustee, assignee, liquidator or a similar official under any Bankruptcy Law.

"Default" means any event which is, or after notice or passage of time would be, an Event of Default. A Default under subparagraph (3) above is not an Event of Default until the trustee or the holders of at least 25% in principal amount of the series notify us of the Default and we do not cure the Default within the time specified after receipt of the notice.

The trustee may require indemnity satisfactory to it before it enforces the indentures or the debt securities of the series. Subject to certain limitations, holders of a majority in principal amount of the debt securities of the series may direct the trustee in its exercise of any trust or power with respect to such series. Except in the case of Default in payment on a series, the trustee may withhold from securityholders of such series notice of any continuing Default if the trustee determines that withholding notice is in the interest of such securityholders. We are required to furnish the trustee annually a brief certificate as to our compliance with all conditions and covenants under the indentures.

The indentures do not have cross-default provisions. Thus, a default by us on any other debt, including any other series of debt securities, would not constitute an Event of Default.

Amendments and Waivers

The indentures and the debt securities or any coupons of the series may be amended, and any Default may be waived as follows:

Unless the securities resolution or supplemental indenture otherwise provides (in which event the applicable prospectus supplement will so state), the debt securities and the indentures may be amended with the consent of the holders of a majority in principal amount of the debt securities of all series affected voting as one class. Unless the securities resolution or supplemental indenture otherwise provides (in which event the applicable prospectus supplement will so state), a Default other than a Default in payment on a particular series may be waived with the consent of the holders of a majority in principal amount of the debt securities of the series. However, without the consent of each securityholder affected, no amendment or waiver may:

●	change the fixed maturity of or the time for payment of interest on any debt security;
●	reduce the principal, premium or interest payable with respect to any debt security;
●	change the place of payment of a debt security or the currency in which the principal or interest on a debt security is payable;
●	change the provisions for calculating any redemption or repurchase price with respect to any debt security;
●	adversely affect any holder's right to receive payment of principal and interest or to institute suit for the enforcement of any such payment;
●	reduce the amount of debt securities whose holders must consent to an amendment or waiver;
●	make any change that materially adversely affects the right to convert any debt security;
●	waive any Default in payment of principal of or interest on a debt security; or
●	adversely affect any holder's rights with respect to redemption or repurchase of a debt security.

Without the consent of any securityholder, the indentures or the debt securities may be amended to:

●	provide for assumption of our obligations to securityholders in the event of a merger or consolidation requiring such assumption;
●	cure any ambiguity, omission, defect or inconsistency;
●	conform the terms of the debt securities to the description thereof in the prospectus and prospectus supplement offering such debt securities;
●	create a series and establish its terms;
●	provide for the acceptance of appointment by a successor trustee or to facilitate the administration of the trusts by more than one trustee;
●	provide for uncertificated or unregistered securities;
●	make any change that does not adversely affect the rights of any securityholder;
●	add to our covenants; or
●	make any other change to the indentures so long as no debt securities are outstanding.

Conversion Rights

Any securities resolution or supplemental indenture establishing a series of debt securities may provide that the debt securities of such series will be convertible at the option of the holders thereof into or for our common stock or other equity or debt instruments. The securities resolution or supplemental indenture may establish, among other things, (1) the number or amount of shares of common stock or other equity or debt instruments for which $1,000 aggregate principal amount of the debt securities of the series is convertible, as may be adjusted pursuant to the terms of the relevant indenture and the securities resolution; and (2) provisions for adjustments to the conversion rate and limitations upon exercise of the conversion right. The indentures provide that we will not be required to make an adjustment in the conversion rate unless the adjustment would require a cumulative change of at least 1% in the conversion rate. However, we will carry forward any adjustments that are less than 1% of the conversion rate and take them into account in any subsequent adjustment of the conversion rate.

Legal Defeasance and Covenant Defeasance

Debt securities of a series may be defeased in accordance with their terms and, unless the securities resolution or supplemental indenture establishing the terms of the series otherwise provides, as set forth below. We at any time may terminate as to a series all of our obligations (except for certain obligations, including obligations with respect to the defeasance trust and obligations to register the transfer or exchange of a debt security, to replace destroyed, lost or stolen debt securities and coupons and to maintain paying agencies in respect of the debt securities) with respect to the debt securities of the series and any related coupons and the relevant indenture, which we refer to as legal defeasance. We at any time may terminate as to a series our obligations with respect to any restrictive covenants which may be applicable to a particular series, which we refer to as covenant defeasance.

We may exercise our legal defeasance option notwithstanding our prior exercise of our covenant defeasance option. If we exercise our legal defeasance option, a series may not be accelerated because of an Event of Default. If we exercise our covenant defeasance option, a series may not be accelerated by reference to any covenant which may be applicable to a series.

To exercise either defeasance option as to a series, we must (1) irrevocably deposit in trust with the trustee (or another trustee) money or U.S. Government Obligations (as defined below), deliver a certificate from a nationally recognized firm of independent accountants expressing their opinion that the payments of principal and interest when due on the deposited U.S. Government Obligations, without reinvestment, plus any deposited money without investment will provide cash at such times and in such amounts as will be sufficient to pay the principal and interest when due on all debt securities of such series to maturity or redemption, as the case may be; and (2) comply with certain other conditions. In particular, we must obtain an opinion of tax counsel that the defeasance will not result in recognition of any gain or loss to holders for federal income tax purposes.

"U.S. Government Obligations" means direct obligations of the United States or any agency or instrumentality of the United States, the payment of which is unconditionally guaranteed by the United States, which, in either case, have the full faith and credit of the United States pledged for payment and which are not callable at the issuer's option, or certificates representing an ownership interest in such obligations.

Regarding the Trustee

Unless otherwise indicated in a prospectus supplement, the trustee will also act as depository of funds, transfer agent, paying agent and conversion agent, as applicable, with respect to the debt securities. In certain circumstances, we or the securityholders may remove the trustee as the trustee under a given indenture. The indenture trustee may also provide additional unrelated services to us as a depository of funds, registrar, trustee and similar services.

Governing Law

The indentures and the debt securities will be governed by New York law, except to the extent that the Trust Indenture Act of 1939 is applicable.

DESCRIPTION OF SUBSCRIPTION RIGHTS

We may issue subscription rights to purchase our equity or debt securities. These subscription rights may be offered independently or together with any other security offered hereby and may or may not be transferable by the stockholder receiving the subscription rights in such offering. In connection with any offering of subscription rights, we may enter into a standby arrangement with one or more underwriters or other purchasers pursuant to which the underwriters or other purchasers may be required to purchase any securities remaining unsubscribed for after such offering.

The prospectus supplement relating to any subscription rights we offer, if any, will, to the extent applicable, include specific terms relating to the offering, including some or all of the following:

●	the price, if any, for the subscription rights;
●	the exercise price payable for our equity or debt securities upon the exercise of the subscription rights;
●	the number of subscription rights to be issued to each stockholder;
●	the number and terms of our equity or debt securities which may be purchased per each subscription right;
●	the extent to which the subscription rights are transferable;
●	any other terms of the subscription rights, including the terms, procedures and limitations relating to the exchange and exercise of the subscription rights;
●	the date on which the right to exercise the subscription rights shall commence, and the date on which the subscription rights shall expire;
●	the extent to which the subscription rights may include an over-subscription privilege with respect to unsubscribed securities or an over-allotment privilege to the extent the securities are fully subscribed; and
●	if applicable, the material terms of any standby underwriting or purchase arrangement which may be entered into by us in connection with the offering of subscription rights.

DESCRIPTION OF UNITS

We may issue units comprised of one or more of the other securities described in this prospectus in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each included security (but, to the extent convertible securities are included in the units, the holder of the units will be deemed the holder of the convertible securities and not the holder of the underlying securities). The unit agreement under which a unit is issued, if any, may provide that the securities included in the unit may not be held or transferred separately, at any time or at any time before a specified date. The applicable prospectus supplement may describe:

●	the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances those securities may be held or transferred separately;
●	any provisions for the issuance, payment, settlement, transfer or exchange of the units or of the securities comprising the units;
●	the terms of the unit agreement governing the units;
●	United States federal income tax considerations relevant to the units; and
●	whether the units will be issued in fully registered global form

This summary of certain general terms of units and any summary description of units in the applicable prospectus supplement do not purport to be complete and are qualified in their entirety by reference to all provisions of the applicable unit agreement and, if applicable, collateral arrangements and depositary arrangements relating to such units. The forms of the unit agreements and other documents relating to a particular issue of units will be filed with the SEC each time we issue units, and you should read those documents for provisions that may be important to you.

FORMS OF SECURITIES

Each debt security and, to the extent applicable, warrant, subscription right and unit, will be represented either by a certificate issued in definitive form to a particular investor or by one or more global securities representing the entire issuance of securities. Certificated securities in definitive form and global securities will be issued in registered form. Definitive securities name you or your nominee as the owner of the security, and in order to transfer or exchange these securities or to receive payments other than interest or other interim payments, you or your nominee must physically deliver the securities to the trustee, registrar, paying agent or other agent, as applicable. Global securities name a depositary or its nominee as the owner of the debt securities or warrants represented by these global securities. The depositary maintains a computerized system that will reflect each investor's beneficial ownership of the securities through an account maintained by the investor with its broker/dealer, bank, trust company or other representative, as we explain more fully below.

Global Securities

Registered Global Securities. We may issue the registered debt securities and, to the extent applicable, warrants, subscription rights and units in the form of one or more fully registered global securities that will be deposited with a depositary or its nominee identified in the applicable prospectus supplement and registered in the name of that depositary or nominee. In those cases, one or more registered global securities will be issued in a denomination or aggregate denominations equal to the portion of the aggregate principal or face amount of the securities to be represented by registered global securities. Unless and until it is exchanged in whole for securities in definitive registered form, a registered global security may not be transferred except as a whole by and among the depositary for the registered global security, the nominees of the depositary or any successors of the depositary or those nominees.

If not described below, any specific terms of the depositary arrangement with respect to any securities to be represented by a registered global security will be described in the prospectus supplement relating to those securities. We anticipate that the following provisions will apply to all depositary arrangements.

Ownership of beneficial interests in a registered global security will be limited to persons, called participants, that have accounts with the depositary or persons that may hold interests through participants. Upon the issuance of a registered global security, the depositary will credit, on its book-entry registration and transfer system, the participants' accounts with the respective principal or face amounts of the securities beneficially owned by the participants. Any dealers, underwriters or agents participating in the distribution of the securities will designate the accounts to be credited. Ownership of beneficial interests in a registered global security will be shown on, and the transfer of ownership interests will be effected only through, records maintained by the depositary, with respect to interests of participants, and on the records of participants, with respect to interests of persons holding through participants. The laws of some states may require that some purchasers of securities take physical delivery of these securities in definitive form. These laws may impair your ability to own, transfer or pledge beneficial interests in registered global securities.

So long as the depositary, or its nominee, is the registered owner of a registered global security, that depositary or its nominee, as the case may be, will be considered the sole owner or holder of the securities represented by the registered global security for all purposes under the applicable indenture or warrant agreement. Except as described below, owners of beneficial interests in a registered global security will not be entitled to have the securities represented by the registered global security registered in their names, will not receive or be entitled to receive physical delivery of the securities in definitive form and will not be considered the owners or holders of the securities under the applicable indenture or warrant agreement. Accordingly, each person owning a beneficial interest in a registered global security must rely on the procedures of the depositary for that registered global security and, if that person is not a participant, on the procedures of the participant through which the person owns its interest, to exercise any rights of a holder under the applicable indenture or warrant agreement. We understand that under existing industry practices, if we request any action of holders or if an owner of a beneficial interest in a registered global security desires to give or take any action that a holder is entitled to give or take under the applicable indenture or warrant agreement, the depositary for the registered global security would authorize the participants holding the relevant beneficial interests to give or take that action, and the participants would authorize beneficial owners owning through them to give or take that action or would otherwise act upon the instructions of beneficial owners holding through them. Principal, premium, if any, and interest payments on debt securities and any payments to holders with respect to warrants represented by a registered global security registered in the name of a depositary or its nominee will be made to the depositary or its nominee, as the case may be, as the registered owner of the registered global security. None of the Company, the trustees, the warrant agents or any other agent of the Company, agent of the trustees or agent of the warrant will have any responsibility or liability for any aspect of the records relating to payments made on account of beneficial ownership interests in the registered global security or for maintaining, supervising or reviewing any records relating to those beneficial ownership interests.

We expect that the depositary for any of the securities represented by a registered global security, upon receipt of any payment of principal, premium, interest or other distribution of underlying securities or other property to holders on that registered global security, will immediately credit participants' accounts in amounts proportionate to their respective beneficial interests in that registered global security as shown on the records of the depositary. We also expect that payments by participants to owners of beneficial interests in a registered global security held through participants will be governed by standing customer instructions and customary practices, as is now the case with the securities held for the accounts of customers in bearer form or registered in "street name," and will be the responsibility of those participants.

If the depositary for any of these securities represented by a registered global security is at any time unwilling or unable to continue as depositary or ceases to be a clearing agency registered under the Exchange Act and a successor depositary registered as a clearing agency under the Exchange Act is not appointed by us within 90 days, we will issue securities in definitive form in exchange for the registered global security that had been held by the depositary. Any securities issued in definitive form in exchange for a registered global security will be registered in the name or names that the depositary gives to the relevant trustee or warrant agent or other relevant agent of ours or theirs. It is expected that the depositary's instructions will be based upon directions received by the depositary from participants with respect to ownership of beneficial interests in the registered global security that had been held by the depositary.

PLAN OF DISTRIBUTION

Initial Offering and Sale of Securities

Unless otherwise set forth in a prospectus supplement accompanying this prospectus, we may sell the securities being offered hereby, from time to time, by one or more of the following methods:

●	to or through underwriting syndicates represented by managing underwriters;
●	through one or more underwriters without a syndicate for them to offer and sell to the public;
●	through dealers or agents; and
●	to investors directly in negotiated sales or in competitively bid transactions.

Offerings of securities covered by this prospectus also may be made into an existing trading market for those securities in transactions at other than a fixed price, either:

●	on or through the facilities of the Nasdaq Capital Market or any other securities exchange or quotation or trading service on which those securities may be listed, quoted, or traded at the time of sale; and/or
●	to or through a market maker other than on the securities exchanges or quotation or trading services set forth above.

Those at-the-market offerings, if any, will be conducted by underwriters acting as principal or agent of the Company, who may also be third-party sellers of securities as described above. The prospectus supplement with respect to the offered securities will set forth the terms of the offering of the offered securities, including:

●	the name or names of any underwriters, dealers or agents;
●	the purchase price of the offered securities and the proceeds to us from such sale;
●	any underwriting discounts and commissions or agency fees and other items constituting underwriters' or agents' compensation;
●	any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers;
●	any securities exchange on which such offered securities may be listed; and
●	any underwriter, agent or dealer involved in the offer and sale of any series of the securities.

The distribution of the securities may be effected from time to time in one or more transactions:

●	at fixed prices, which may be changed;
●	at market prices prevailing at the time of the sale;
●	at varying prices determined at the time of sale; or
●	at negotiated prices.

Each prospectus supplement will set forth the manner and terms of an offering of securities including:

●	whether that offering is being made to underwriters, through agents or directly to the public;
●	the rules and procedures for any auction or bidding process, if used;
●	the securities' purchase price or initial public offering price; and
●	the proceeds we anticipate from the sale of the securities, if any.

In addition, we may enter into derivative or hedging transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. The applicable prospectus supplement may indicate, in connection with such a transaction, that the third parties may sell securities covered by and pursuant to this prospectus and an applicable prospectus supplement. If so, the third party may use securities pledged by us or borrowed from us or others to settle such sales and may use securities received from us to close out any related short positions. We may also loan or pledge securities covered by this prospectus and an applicable prospectus supplement to third parties, who may sell the loaned securities or, in an event of default in the case of a pledge, sell the pledged securities pursuant to this prospectus and the applicable prospectus supplement.

Sales Through Underwriters

If underwriters are used in the sale of some or all of the securities covered by this prospectus, the underwriters will acquire the securities for their own account. The underwriters may resell the securities, either directly to the public or to securities dealers, at various times in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. The obligations of the underwriters to purchase the securities will be subject to certain conditions. Unless indicated otherwise in a prospectus supplement, the underwriters will be obligated to purchase all the securities of the series offered if any of the securities are purchased.

Any public offering price and any concessions allowed or reallowed to dealers may be changed intermittently.

Sales Through Agents

Unless otherwise indicated in the applicable prospectus supplement, when securities are sold through an agent, the designated agent will agree, for the period of its appointment as agent, to use specified efforts to sell the securities for our account and will receive commissions from us as will be set forth in the applicable prospectus supplement.

Securities bought in accordance with a redemption or repayment under their terms also may be offered and sold, if so indicated in the applicable prospectus supplement, in connection with a remarketing by one or more firms acting as principals for their own accounts or as agents for us. Any remarketing firm will be identified and the terms of its agreement, if any, with us and its compensation will be described in the prospectus supplement. Remarketing firms may be deemed to be underwriters in connection with the securities remarketed by them.

If so indicated in the applicable prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers by certain specified institutions to purchase securities at a price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a future date specified in the prospectus supplement. These contracts will be subject only to those conditions set forth in the applicable prospectus supplement, and the prospectus supplement will set forth the commissions payable for solicitation of these contracts.

Direct Sales

We may also sell offered securities directly to institutional investors or others. In this case, no underwriters or agents would be involved. The terms of such sales will be described in the applicable prospectus supplement.

General Information

Broker-dealers, agents or underwriters may receive compensation in the form of discounts, concessions or commissions from us and/or the purchasers of securities for whom such broker-dealers, agents or underwriters may act as agents or to whom they sell as principal, or both. This compensation to a particular broker-dealer might be in excess of customary commissions.

Underwriters, dealers and agents that participate in any distribution of the offered securities may be deemed "underwriters" within the meaning of the Securities Act so any discounts or commissions they receive in connection with the distribution may be deemed to be underwriting compensation. Those underwriters and agents may be entitled, under their agreements with us, to indemnification by us against certain civil liabilities, including liabilities under the Securities Act, or to contribution by us to payments that they may be required to make in respect of those civil liabilities. Certain of those underwriters or agents may be customers of, engage in transactions with, or perform services for, us or our affiliates in the ordinary course of business. We will identify any underwriters or agents, and describe their compensation, in a prospectus supplement. Any institutional investors or others that purchase offered securities directly, and then resell the securities, may be deemed to be underwriters, and any discounts or commissions received by them from us and any profit on the resale of the securities by them may be deemed to be underwriting discounts and commissions under the Securities Act.

We will file a supplement to this prospectus, if required, pursuant to Rule 424(b) under the Securities Act, if we enter into any material arrangement with a broker, dealer, agent or underwriter for the sale of securities through a block trade, special offering, exchange distribution or secondary distribution or a purchase by a broker or dealer. Such prospectus supplement will disclose:

●	the name of any participating broker, dealer, agent or underwriter;
●	the number and type of securities involved;
●	the price at which such securities were sold;
●	any securities exchanges on which such securities may be listed;
●	the commissions paid or discounts or concessions allowed to any such broker, dealer, agent or underwriter, where applicable; and
●	other facts material to the transaction.

In order to facilitate the offering of certain securities under this prospectus or an applicable prospectus supplement, certain persons participating in the offering of those securities may engage in transactions that stabilize, maintain or otherwise affect the price of those securities during and after the offering of those securities. Specifically, if the applicable prospectus supplement permits, the underwriters of those securities may over-allot or otherwise create a short position in those securities for their own account by selling more of those securities than have been sold to them by us and may elect to cover any such short position by purchasing those securities in the open market.

In addition, the underwriters may stabilize or maintain the price of those securities by bidding for or purchasing those securities in the open market and may impose penalty bids, under which selling concessions allowed to syndicate members or other broker-dealers participating in the offering are reclaimed if securities previously distributed in the offering are repurchased in connection with stabilization transactions or otherwise. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. The imposition of a penalty bid may also affect the price of securities to the extent that it discourages resales of the securities. No representation is made as to the magnitude or effect of any such stabilization or other transactions. Such transactions, if commenced, may be discontinued at any time.

In order to comply with the securities laws of certain states, if applicable, the securities must be sold in such jurisdictions only through registered or licensed brokers or dealers. In addition, in certain states the securities may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with.

Rule 15c6-1 under the Exchange Act generally requires that trades in the secondary market settle in one business day unless the parties to any such trade expressly agree otherwise. Your prospectus supplement may provide that the original issue date for your securities may be more than one scheduled business day after the trade date for your securities. Accordingly, in such a case, if you wish to trade securities on any date prior to the first business day before the original issue date for your securities, you will be required, by virtue of the fact that your securities initially are expected to settle in more than one scheduled business day after the trade date for your securities, to make alternative settlement arrangements to prevent a failed settlement.

This prospectus, any applicable prospectus supplement and any applicable pricing supplement in electronic format may be made available on the Internet sites of, or through other online services maintained by, us and/or one or more of the agents and/or dealers participating in an offering of securities, or by their affiliates. In those cases, prospective investors may be able to view offering terms online and, depending upon the particular agent or dealer, prospective investors may be allowed to place orders online.

Other than this prospectus, any applicable prospectus supplement and any applicable pricing supplement in electronic format, the information on our website or the website of any agent or dealer, and any information contained in any other website maintained by any agent or dealer:

●	is not part of this prospectus, any applicable prospectus supplement or any applicable pricing supplement or the registration statement of which they form a part;
●	has not been approved or endorsed by us or by any agent or dealer in its capacity as an agent or dealer, except, in each case, with respect to the respective website maintained by such entity; and
●	should not be relied upon by investors.

There can be no assurance that we will sell all or any of the securities offered by this prospectus.

This prospectus may also be used in connection with any issuance of common stock or preferred stock upon exercise of a warrant if such issuance is not exempt from the registration requirements of the Securities Act.

In addition, we may issue the securities as a dividend or distribution or in a subscription rights offering to our existing securityholders. In some cases, we or dealers acting with us or on our behalf may also purchase securities and reoffer them to the public by one or more of the methods described above. This prospectus may be used in connection with any offering of our securities through any of these methods or other methods described in the applicable prospectus supplement.

LEGAL MATTERS

Unless otherwise indicated in the applicable prospectus supplement, the validity of the shares of our capital stock offered hereby will be passed upon for us by Brownstein Hyatt Farber Schreck, LLP, Las Vegas, Nevada, and the validity of the other securities offered hereby will be passed upon for us by Lowenstein Sandler LLP, New York, New York. If the validity of the securities offered hereby in connection with offerings made pursuant to this prospectus are passed upon by counsel for the underwriters, dealers or agents, if any, such counsel will be named in the prospectus supplement relating to such offering.

EXPERTS

The consolidated balance sheets of Soluna Holdings, Inc. and its subsidiaries as of December 31, 2024 and 2023, and the related consolidated statements of operations, changes in equity, and cash flows for each of the years then ended have been audited by UHY LLP, independent registered public accounting firm, as stated in their report which is incorporated herein by reference. Such financial statements have been incorporated herein by reference in reliance on the report of such firm given upon their authority as experts in accounting and auditing.

ADDITIONAL INFORMATION

We have filed with the SEC a registration statement on Form S-3 under the Securities Act with respect to the securities offered by this prospectus. Pursuant to SEC rules, this prospectus, which is part of the registration statement, omits certain information, exhibits, schedules and undertakings set forth in the registration statement. For further information pertaining to us and our securities, reference is made to our SEC filings and to the registration statement and the exhibits and schedules to the registration statement of which this prospectus forms a part. Statements contained in this prospectus as to the contents or provisions of any documents referred to in this prospectus are not necessarily complete, and in each instance where a copy of the document has been filed as an exhibit to the registration statement, reference is made to the exhibit for a more complete description of the matters involved.

In addition, registration statements and certain other filings made with the SEC electronically are publicly available through the SEC's web site at http://www.sec.gov. The registration statement, including all exhibits and amendments to the registration statement, has been filed electronically with the SEC.

We are subject to the information and periodic reporting requirements of the Exchange Act and, in accordance with such requirements, will file periodic reports, proxy statements, and other information with the SEC. These periodic reports, proxy statements, and other information will be available for inspection and copying at the web site of the SEC referred to above. We also maintain a website at www.solunacomputing.com, at which you may access these materials free of charge as soon as reasonably practicable after they are electronically filed with, or furnished to, the SEC. The information contained in, or that can be accessed through, our website is not part of, and is not incorporated into, this prospectus. We have included our website address in this prospectus solely as an inactive textual reference.

You should rely only on the information in this prospectus and the additional information described above and under the heading "Incorporation of Certain Information by Reference" below. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely upon it. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information in this prospectus was accurate on the date of the front cover of this prospectus only. Our business, financial condition, results of operations and prospects may have changed since that date.

The representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference into this prospectus were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreement, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties or covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately representing the current state of our affairs.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to "incorporate by reference" information that we file with it into this prospectus, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus. The information incorporated by reference is considered to be a part of this prospectus, and information that we file later with the SEC will automatically update and supersede information contained in this prospectus and any accompanying prospectus supplement.

We incorporate by reference the documents listed below that we have previously filed with the SEC:

●	our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC on March 31, 2025;
●	our Current Reports on Form 8-K filed with the SEC on February 10, 2025, March 18, 2025, March 27, 2025, and March 28, 2025 (other than any portions thereof deemed furnished and not filed); and
●	the description of our common stock contained in our Registration Statement on Form 8-A, filed with the SEC on March 22, 2021, as updated by the Description of Securities set forth on Exhibit 4.14 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, as filed with the SEC on March 31, 2025, including any amendments thereto or reports filed for the purposes of updating this description.

All reports and other documents that we file with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of the initial filing of the registration statement and prior to effectiveness of the registration statement and after the date of this prospectus but prior to the termination of the offering of the securities hereunder will also be considered to be incorporated by reference into this prospectus from the date of the filing of these reports and documents, and will supersede the information herein; provided, however, that all reports, exhibits and other information that we "furnish" to the SEC will not be considered incorporated by reference into this prospectus. Any statement contained in a document incorporated by reference in this prospectus or any prospectus supplement shall be deemed to be modified or superseded to the extent that a statement contained herein, therein or in any other subsequently filed document that also is incorporated by reference herein or therein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus or any prospectus supplement.

We will provide you without charge, upon your oral or written request, with a copy of any or all reports, proxy statements and other documents we file with the SEC, as well as any or all of the documents incorporated by reference in this prospectus or the registration statement (other than exhibits to such documents unless such exhibits are specifically incorporated by reference into such documents). Requests for such copies should be directed to:

Soluna Holdings, Inc.
325 Washington Avenue Extension
Albany, NY 12205

(518) 218-2550

Attn: Christopher Gandolfo
[email protected]

5,929,944Shares of Common Stock

Pre-Funded Warrants to Purchase 12,149,200 Shares of Common Stock

Series C Warrants to Purchase 18,079,144 Shares of Common Stock

Placement Agent Warrants to Purchase 903,957 Shares of Common Stock

31,132,301 Shares of Common Stock underlying the Pre-Funded Warrants, Series C Warrants and Placement Agent Warrants

PROSPECTUS SUPPLEMENT

H.C. Wainwright & Co.

The date of this prospectus supplement is December 4, 2025.