Supplemental Prospectus (Form 424B5)

Filed Pursuant to Rule 424(b)(5)
Registration Statement No. 333-296919

PROSPECTUS SUPPLEMENT

(To Prospectus dated September 10, 2026)

Common Stock

Having an Aggregate Offering Price of Up to

$1,000,000,000

This prospectus supplement and the accompanying base prospectus relate to the offer and sale from time to time of shares of our common stock, par value $0.01 per share, in an amount having an aggregate offering price of up to $1,000,000,000 through BofA Securities, Inc. acting as sales agent or principal, or, if applicable, as Forward Seller (as defined below) acting as agent or principal of the Forward Purchaser (as defined below). These sales, if any, will be made pursuant to the terms of an equity distribution agreement among us, the manager and the Forward Purchaser, which was filed with the Securities and Exchange Commission ("SEC") on August 4, 2026 as an exhibit to the Predecessor's (as defined below) Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, as amended by Amendment No. 1 to the Equity Distribution Agreement, dated as of September 15, 2026, which was filed with the SEC on September 15, 2026 as an exhibit to a Current Report on Form 8-K (the "Equity Distribution Agreement").

Under the terms of the Equity Distribution Agreement, we also may sell our common stock to the manager as principal for its own account at a price agreed upon at the time of the sale. If we sell our common stock to the manager as principal, we will enter into a separate terms agreement with the manager and we will describe that agreement in a separate prospectus supplement or pricing supplement.

The Equity Distribution Agreement contemplates that, in addition to the issuance and sale by us of shares of our common stock to or through the manager as our sales agent, we may enter into separate forward sale agreements (each, together with any related pricing supplement, a "forward sale agreement" and, collectively, the "forward sale agreements"), with Bank of America, N.A. ( the "Forward Purchaser"). If we enter into a forward sale agreement with the Forward Purchaser, we expect that the Forward Purchaser, acting in accordance with the mutually accepted instructions related to such forward sale agreement, will attempt to borrow and sell, through the manager, acting as agent for the Forward Purchaser, shares of our common stock to hedge the Forward Purchaser's exposure under such forward sale agreement. We refer to the manager, when acting as agent or principal for the Forward Purchaser, as the "Forward Seller." We will not initially receive any proceeds from any sale of shares of our common stock borrowed by the Forward Purchaser and sold through the Forward Seller.

We currently expect to fully physically settle each forward sale agreement, if any, with the Forward Purchaser on one or more dates specified by us on or prior to the maturity date of such forward sale agreement. However, subject to certain exceptions, we may also elect, in our sole discretion, to cash settle or net share settle all or any portion of our obligations under any forward sale agreement, in which case we may not receive any proceeds (in the case of cash settlement) or will not receive any proceeds (in the case of net share settlement), and we may owe cash (in the case of cash settlement) or shares of our common stock (in the case of net share settlement) to the Forward Purchaser. See "Plan of Distribution."

Our common stock is listed on the New York Stock Exchange (the "NYSE"), under the symbol "OKE." The last reported sale price of our common stock on September 14, 2026 was $96.97 per share.

Sales of our common stock under this prospectus supplement, if any, will be made from time to time by means of ordinary brokers' transactions through the facilities of the NYSE at market prices, in block transactions, or as otherwise agreed among us and the manager, as our sales agent or as Forward Seller, by means of any other existing trading market for our common stock or to or through a market maker other than on an exchange. We or the manager may suspend the offering of common stock at any time and from time to time by notifying the other party. The offering of the shares is subject to receipt and acceptance and subject to the manager's right to reject any order in whole or in part.

Investing in our common stock involves a high degree of risk. Before buying any common stock, you should read the discussion of material risks of investing in our common stock in "Risk Factors" beginning on page S-4 of this prospectus supplement, on page 6 of the accompanying base prospectus and the other risks identified in the documents incorporated by reference herein before making a decision to purchase our common stock in this offering.

The compensation to the manager for sales of common stock under this prospectus supplement shall be up to, but shall not exceed, 2.0% of the gross sale price of common stock sold by the manager. The compensation to the manager acting as the Forward Seller will be a mutually agreed commission in the form of a reduction to the initial forward price under the related forward sale agreement that shall be up to, but shall not exceed, 2.0% of the gross sales price of the borrowed shares of our common stock sold through the manager, acting as Forward Seller, during the applicable forward hedge selling period for such shares (which gross sales price will be adjusted for daily accruals based on a floating interest rate, less a spread, and specified amounts related to expected dividends on shares of our common stock if an "ex-dividend" date occurs during such forward hedge selling period). Please read "Plan of Distribution" in this prospectus supplement. The net proceeds we receive from any sales under this prospectus supplement will be used as described under "Use of Proceeds" in this prospectus supplement.

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

BofA Securities

Prospectus Supplement dated September 15, 2026.

IMPORTANT NOTICE ABOUT INFORMATION IN THIS

PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING BASE PROSPECTUS

This document is in two parts. The first part is this prospectus supplement, which describes the terms of the offer and sale from time to time of our common stock pursuant to the Equity Distribution Agreement. The second part is the accompanying base prospectus, which gives more general information, some of which may not apply to the offer and sale from time to time of our common stock pursuant to the Equity Distribution Agreement. Generally, when we refer only to the "prospectus," we are referring to both parts combined. If information varies between this prospectus supplement and the accompanying base prospectus, you should rely on the information in this prospectus supplement.

Any statement made in this prospectus supplement, the accompanying base prospectus or in a document incorporated or deemed to be incorporated by reference into this prospectus supplement or the accompanying base prospectus will be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement, the accompanying base prospectus or in any other subsequently filed document that is also incorporated by reference into this prospectus supplement modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement or the accompanying base prospectus. Please read "Where You Can Find More Information" and "Incorporation by Reference" in this prospectus supplement and the accompanying base prospectus.

We have not, and the manager, the Forward Seller and the Forward Purchaser have not, authorized any dealer or other person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus supplement and the accompanying base prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. This prospectus supplement and the accompanying base prospectus do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor does this prospectus supplement or the accompanying base prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction. You should not assume that the information contained in this prospectus supplement or the accompanying base prospectus or in any free writing prospectus is accurate on any date other than the respective date of such document.

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TABLE OF CONTENTS

PROSPECTUS SUPPLEMENT

PROSPECTUS

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RISK FACTORS

An investment in our common stock involves risk. You should carefully read the risk factors set forth in our most recent Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q and those that are included in this prospectus supplement, in the accompanying base prospectus or that may be included in any applicable prospectus supplement, together with all of the other information included in, or incorporated by reference into, this prospectus supplement and the accompanying base prospectus, when evaluating an investment in our common stock.

Risks Related to any Forward Sale Agreements

Settlement provisions contained in any forward sale agreement subject us to certain risks.

The Forward Purchaser will have the right to accelerate its forward sale agreement (with respect to all or any portion of the transaction under such forward sale agreement that the Forward Purchaser determines is affected by an event described below) and require us to physically settle or, if we so elect and the Forward Purchaser permits our election, cash settle or net share settle on a date specified by the Forward Purchaser if:

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The Forward Purchaser's decision to exercise its right to accelerate the settlement of any forward sale agreement will be made irrespective of our interests, including our need for capital. In such cases, we could be required to issue and deliver shares of our common stock under the physical settlement provisions of the applicable forward sale agreement irrespective of our capital needs, which would result in dilution to our diluted earnings per share.

We expect that any forward sale agreement will be physically settled by delivery of shares of our common stock, unless we elect to cash settle or net share settle the forward sale agreement, subject to the satisfaction of certain conditions. Upon physical settlement or, if we so elect, net share settlement of any forward sale agreement, delivery of shares of our common stock in connection with such physical settlement or, to the extent we are obligated to deliver shares of our common stock, net share settlement will result in dilution to our earnings per share and dividends per share.

If we elect cash settlement or net share settlement with respect to all or a portion of the shares of our common stock underlying a forward sale agreement, we expect the Forward Purchaser (or an affiliate thereof) to purchase a number of shares of our common stock in secondary market transactions over an unwind period to:

In addition, the purchase of shares of our common stock in connection with the Forward Purchaser or its affiliate unwinding its hedge positions could cause the price of shares of our common stock to increase over such time (or prevent a decrease over such time), thereby increasing the amount of cash we would owe to the Forward Purchaser (or decreasing the amount of cash that the Forward Purchaser would owe us) upon a cash settlement of the relevant forward sale agreement or increasing the number of shares of our common stock we would deliver to the Forward Purchaser (or decreasing the number of shares of our common stock that the Forward Purchaser would deliver to us) upon net share settlement of the relevant forward sale agreement.

The forward sale price we expect to receive upon physical settlement of any forward sale agreement will be subject to adjustment on a daily basis based on a floating interest rate factor equal to a specified daily rate less a spread to be mutually agreed by us and the Forward Purchaser, and will be decreased on certain dates based on amounts related to expected dividends on shares of our common stock during the term of such forward sale agreement. If the specified daily rate is less than the spread under such forward sale agreement on any day, the interest factor will result in a daily reduction of the forward sale price. If the volume weighted average price at which the Forward Purchaser (or its affiliate) is able to purchase shares during the applicable unwind period under a forward sale agreement is above the relevant forward sale price, in the case of cash settlement, we would pay the Forward Purchaser under such forward sale agreement an amount in cash equal to the difference or, in the case of net share settlement, we would deliver to the Forward Purchaser a number of shares of our common stock having a value equal to the difference. Thus, we could be responsible for a potentially substantial cash payment in the case of cash settlement. If the volume weighted average price at which the Forward Purchaser (or its affiliate) is able to purchase shares during the applicable unwind period under a forward sale agreement is below the relevant forward sale price, in the case of cash settlement, we would be paid the difference in cash by the Forward Purchaser under such forward sale agreement or, in the case of net share settlement, we would receive from the Forward Purchaser a number of shares of our common stock having a value equal to the difference. See "Plan of Distribution" for information on the forward sale agreements.

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In case of our bankruptcy or insolvency, the forward sale agreements would automatically terminate, and we would not receive the expected proceeds from the sale of shares of our common stock.

If we or a regulatory authority with jurisdiction over us institutes, or we consent to, a proceeding seeking a judgment in bankruptcy or insolvency or any other relief under any bankruptcy or insolvency law or other similar law affecting creditors' rights, or we or a regulatory authority with jurisdiction over us presents a petition for our winding-up or liquidation, or we consent to such a petition, the forward sale agreements will automatically terminate. If a forward sale agreement so terminates, we would not be obligated to deliver to the Forward Purchaser any shares of our common stock not previously delivered, and the Forward Purchaser would be discharged from its obligation to pay the relevant forward sale price per share in respect of any shares of our common stock not previously settled. Therefore, to the extent that there are any shares of our common stock with respect to which such forward sale agreement has not been settled at the time of the commencement of any such bankruptcy or insolvency proceedings, we would not receive the relevant forward sale price per share in respect of those shares of our common stock.

This offering and future issuances of our common stock could be dilutive to our earnings per share.

The issuance and sale by us of any shares of our common stock in this offering or upon settlement of any forward sale agreements we may enter into with the Forward Purchaser, the receipt of the net proceeds therefrom and the use of those net proceeds could have a dilutive effect on our earnings per share. Additional issuances of our common stock, including in connection with development activity and acquisitions, if any, could also be dilutive to our earnings per share. The issuance or sale by us of our common stock, including the sale by us of shares in this offering or pursuant to any forward sale agreements, in connection with acquisitions, if any, or in the secondary market (including upon the issuance of shares of common stock under our stock option and other equity incentive plans or pursuant to options or other awards granted under those plans), or the perception that such additional issuances or sales could occur, could also adversely affect the trading price of our common stock and our ability to raise capital through future offerings of equity or equity-related securities. In addition, if we are unable to apply any net proceeds we may receive from this offering or from settlement under any forward sale agreements we may enter into to make investments that generate sufficient revenues to offset the dilutive impact of the issuance by us of shares of our common stock in this offering or pursuant to those forward sale agreements, there will be further dilution of our earnings per share.

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USE OF PROCEEDS

We intend to use the net proceeds of any sales of shares of our common stock to or through the sales agent and the net cash proceeds from the settlement of any forward sales agreements, after deducting manager's (or, if applicable, the Forward Purchaser's) commissions and our offering expenses, for general corporate purposes, which may include repaying or refinancing a portion of our outstanding indebtedness and funding working capital, capital expenditures or acquisitions.

We will not initially receive any proceeds from any sale of borrowed shares of our common stock by the Forward Purchaser in connection with a forward sale agreement as a hedge of such forward sale agreement. In the event of full physical settlement of a forward sale agreement, which we expect to occur on or prior to the maturity date of the forward sale agreement, we expect to receive aggregate cash proceeds equal to the product of the forward sale price under the forward sale agreement and the number of shares of our common stock underlying the forward sale agreement, subject to the price adjustment and other provisions of the forward sale agreement. If, however, we elect to cash settle or net share settle any forward sale agreement, we would expect to receive an amount of proceeds that is significantly lower than the product set forth in the preceding sentence (in the case of any cash settlement) or will not receive any proceeds (in the case of any net share settlement), and we may owe cash (in the case of any cash settlement) or shares of our common stock (in the case of any net share settlement) to the Forward Purchaser. See "Plan of Distribution."

If we enter into a forward sale agreement with the Forward Purchaser, we expect that the Forward Purchaser or its affiliate will attempt to borrow from third parties and sell, through the manager, acting as Forward Seller, shares of our common stock to hedge the Forward Purchaser's exposure under such forward sale agreement. All of the net proceeds from the sale of any such borrowed shares will be paid to the Forward Purchaser (or one or more of its affiliates). The Forward Purchaser will be either the manager or an affiliate of the manager. As a result, the manager or its affiliate will receive the net proceeds from any sale of borrowed shares of our common stock made in connection with any forward sale agreements.

An affiliate of the manager is a lender under our revolving credit facility. To the extent we use proceeds from this offering to repay indebtedness under our revolving credit facility, such affiliate may receive proceeds from this offering. Additionally, an affiliate of the manager is a dealer under our commercial paper program. To the extent we use proceeds from this offering to repay notes issued under our commercial paper program and such affiliate holds such notes, such affiliate may receive proceeds from this offering. Please read "Plan of Distribution."

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MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS

The following discussion is a summary of the material U.S. federal income tax consequences to Non-U.S. Holders (as defined below) of the purchase, ownership and disposition of our common stock issued pursuant to this offering, but does not purport to be a complete analysis of all potential tax effects. The effects of other U.S. federal tax laws, such as estate and gift tax laws, and any applicable state, local or non-U.S. tax laws are not discussed. This discussion is based on the U.S. Internal Revenue Code of 1986, as amended (the "Code"), Treasury Regulations promulgated thereunder, judicial decisions, and published rulings and administrative pronouncements of the U.S. Internal Revenue Service (the "IRS"), in each case in effect as of the date hereof. These authorities may change or be subject to differing interpretations. Any such change or differing interpretation may be applied retroactively in a manner that could adversely affect a Non-U.S. Holder of our common stock. We have not sought and will not seek any rulings from the IRS regarding the matters discussed below. There can be no assurance the IRS or a court will not take a contrary position to that discussed below regarding the tax consequences of the purchase, ownership and disposition of our common stock.

This discussion is limited to Non-U.S. Holders that hold our common stock as a "capital asset" within the meaning of Section 1221 of the Code (generally, property held for investment). This discussion does not address all U.S. federal income tax consequences relevant to a Non-U.S. Holder's particular circumstances, including the impact of the Medicare contribution tax on net investment income. In addition, it does not address consequences relevant to Non-U.S. Holders subject to special rules, including, without limitation:

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If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds our common stock, the tax treatment of a partner in the partnership will depend on the status of the partner, the activities of the partnership and certain determinations made at the partner level. Accordingly, partnerships holding our common stock and the partners in such partnerships should consult their tax advisors regarding the U.S. federal income tax consequences to them.

THIS DISCUSSION IS FOR INFORMATIONAL PURPOSES ONLY AND IS NOT TAX ADVICE. INVESTORS SHOULD CONSULT THEIR TAX ADVISORS WITH RESPECT TO THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS TO THEIR PARTICULAR SITUATIONS AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK ARISING UNDER THE U.S. FEDERAL ESTATE OR GIFT TAX LAWS OR UNDER THE LAWS OF ANY STATE, LOCAL OR NON-U.S. TAXING JURISDICTION OR UNDER ANY APPLICABLE TAX TREATY.

Definition of a Non-U.S. Holder

For purposes of this discussion, a "Non-U.S. Holder" is any beneficial owner of our common stock that is neither a "U.S. person" nor an entity or arrangement treated as a partnership for U.S. federal income tax purposes. A U.S. person is any person that, for U.S. federal income tax purposes, is or is treated as any of the following:

Distributions

Distributions of cash or property on our common stock will constitute dividends for U.S. federal income tax purposes to the extent paid from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles. Amounts not treated as dividends for U.S. federal income tax purposes will constitute a return of capital and first be applied against and reduce a Non-U.S. Holder's adjusted tax basis in its common stock, but not below zero. Any excess will be treated as capital gain and will be treated as described below under "-Sale or Other Taxable Disposition."

Except as described in the discussion below on effectively connected income and subject to the discussions of backup withholding and FATCA, dividends paid to a Non-U.S. Holder of our common stock will be subject to U.S. federal withholding tax at a rate of 30% of the gross amount of the dividends (or such lower rate specified by an applicable income tax treaty, provided the Non-U.S. Holder furnishes a valid IRS Form W-8BEN or W-8BEN-E (or other applicable documentation) certifying qualification for the lower treaty rate). A Non-U.S. Holder that does not timely furnish the required documentation, but that qualifies for a reduced treaty rate, may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS. Non-U.S. Holders should consult their tax advisors regarding their entitlement to benefits under any applicable income tax treaty.

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If dividends paid to a Non-U.S. Holder are effectively connected with the Non-U.S. Holder's conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, the Non-U.S. Holder maintains a permanent establishment in the United States to which such dividends are attributable), the Non-U.S. Holder will be exempt from the U.S. federal withholding tax described above. To claim the exemption, the Non-U.S. Holder must furnish to the applicable withholding agent a valid IRS Form W-8ECI, certifying that the dividends are effectively connected with the Non-U.S. Holder's conduct of a trade or business within the United States.

Any such effectively connected dividends will be subject to U.S. federal income tax on a net income basis at the regular graduated rates applicable to U.S. persons. A Non-U.S. Holder that is a corporation also may be subject to a branch profits tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on such effectively connected dividends, as adjusted for certain items. Non-U.S. Holders should consult their tax advisors regarding any applicable tax treaties that may provide for different rules.

Sale or Other Taxable Disposition

A Non-U.S. Holder will not be subject to U.S. federal income tax on any gain realized upon the sale or other taxable disposition of our common stock unless:

Gain described in the first bullet point above generally will be subject to U.S. federal income tax on a net income basis at the regular graduated rates applicable to U.S. persons. A Non-U.S. Holder that is a corporation also may be subject to a branch profits tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on such effectively connected gain, as adjusted for certain items.

A Non-U.S. Holder described in the second bullet point above will be subject to U.S. federal income tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on gain realized upon the sale or other taxable disposition of our common stock, which may be offset by U.S. source capital losses of the Non-U.S. Holder (even though the individual is not considered a resident of the United States), provided the Non-U.S. Holder has timely filed U.S. federal income tax returns with respect to such losses.

With respect to the third bullet point above, we believe that we currently are, and expect to remain for the foreseeable future, a USRPHC for U.S. federal income tax purposes. However, a Non-U.S. Holder of our common stock generally will not be subject to U.S. net federal income tax as a result of our being a USRPHC if our common stock is "regularly traded," as defined by applicable Treasury Regulations, on an established securities market, and such Non-U.S. Holder owned, actually or constructively, 5% or less of our common stock throughout the shorter of the five-year period ending on the date of the sale or other taxable disposition or the Non-U.S. Holder's holding period (such period, the "applicable period"). If our common stock is not considered to be so traded or the Non-U.S. Holder owned 5% or more of our common stock at any time during the applicable period, a Non-U.S. Holder generally would be subject to net U.S. federal income tax on the gain realized on a disposition of our common stock as a result of our being a USRPHC and generally would be required to file a U.S. federal income tax return. Additionally, if our common stock is not considered to be regularly traded, a 15% withholding tax would apply to the gross proceeds from a disposition.

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Non-U.S. Holders should consult their tax advisors regarding potentially applicable income tax treaties that may provide for different rules.

Information Reporting and Backup Withholding

Payments of dividends on our common stock will not be subject to backup withholding, provided the applicable withholding agent does not have actual knowledge or reason to know the holder is a United States person and the holder either certifies its non-U.S. status, such as by furnishing a valid IRS Form W-8BEN, W-8BEN-E or W-8ECI, or otherwise establishes an exemption. However, information returns are required to be filed with the IRS in connection with any distributions on our common stock paid to the Non-U.S. Holder, regardless of whether such distributions constitute dividends or whether any tax was actually withheld. In addition, proceeds of the sale or other taxable disposition of our common stock within the United States or conducted through certain U.S.-related brokers generally will not be subject to backup withholding or information reporting, if the applicable withholding agent receives the certification described above and does not have actual knowledge or reason to know that such holder is a United States person, or the holder otherwise establishes an exemption. Proceeds of a disposition of our common stock conducted through a non-U.S. office of a non-U.S. broker generally will not be subject to backup withholding or information reporting.

Copies of information returns that are filed with the IRS may also be made available under the provisions of an applicable treaty or agreement to the tax authorities of the country in which the Non-U.S. Holder resides or is established.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against a Non-U.S. Holder's U.S. federal income tax liability, provided the required information is timely furnished to the IRS.

Additional Withholding Tax on Payments Made to Foreign Accounts

Withholding taxes may be imposed under Sections 1471 to 1474 of the Code (such Sections commonly referred to as the Foreign Account Tax Compliance Act, or "FATCA") on certain types of payments made to non-U.S. financial institutions and certain other non-U.S. entities. Specifically, a 30% withholding tax may be imposed on dividends on, or (subject to the proposed Treasury Regulations discussed below) gross proceeds from the sale or other disposition of, our common stock paid to a "foreign financial institution" or a "non-financial foreign entity" (each as defined in the Code), unless (1) the foreign financial institution undertakes certain diligence and reporting obligations, (2) the non-financial foreign entity either certifies it does not have any "substantial United States owners" (as defined in the Code) or furnishes identifying information regarding each substantial United States owner, or (3) the foreign financial institution or non-financial foreign entity otherwise qualifies for an exemption from these rules. If the payee is a foreign financial institution and is subject to the diligence and reporting requirements in (1) above, it must enter into an agreement with the U.S. Department of the Treasury requiring, among other things, that it undertake to identify accounts held by certain "specified United States persons" or "United States owned foreign entities" (each as defined in the Code), annually report certain information about such accounts, and withhold 30% on certain payments to non-compliant foreign financial institutions and certain other account holders. Foreign financial institutions located in jurisdictions that have an intergovernmental agreement with the United States governing FATCA may be subject to different rules.

Under the applicable Treasury Regulations and administrative guidance, withholding under FATCA generally applies currently to payments of dividends on our common stock. While withholding under FATCA would have applied also to payments of gross proceeds from the sale or other disposition of stock on or after January 1, 2019, proposed Treasury Regulations eliminate FATCA withholding on payments of gross proceeds entirely. Taxpayers generally may rely on these proposed Treasury Regulations until final Treasury Regulations are issued.

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Prospective investors should consult their tax advisors regarding the potential application of withholding under FATCA to their investment in our common stock.

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PLAN OF DISTRIBUTION

On August 4, 2026, the Predecessor entered into an Equity Distribution Agreement with BofA Securities, Inc., as manager, and Bank of America, N.A., as Forward Purchaser (as defined below), under which we are permitted to offer and sell from time to time shares of our common stock having an aggregate offering price of up to $1,000,000,000 through the manager, acting as sales agent, or, if applicable, as Forward Seller in connection with any forward sale agreements. On August 4, 2026, the Predecessor filed the Equity Distribution Agreement with the SEC as an exhibit to its Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, which is incorporated by reference into this prospectus supplement. On September 15, 2026, we entered into an amendment to the Equity Distribution Agreement, under which we assumed the Predecessor's obligations thereunder, and filed such amendment with the SEC as an exhibit to our Current Report on Form 8-K. The sales, if any, of common stock made under the Equity Distribution Agreement will be made through the manager, as our sales agent or as Forward Seller, by means of ordinary brokers' transactions on the NYSE at market prices, in block transactions, or as otherwise agreed upon by the manager and us, by means of any other existing trading market for our common stock or to or through a market maker other than on an exchange. The manager will not engage in any transactions that stabilize the price of our common stock.

The Equity Distribution Agreement contemplates that, in addition to the issuance and sale by us of shares of our common stock to or through the manager as our sales agent, we may enter into separate forward sale agreements (each, together with any related pricing supplement, a "forward sale agreement" and, collectively, the "forward sale agreements"), with Bank of America, N.A. (the "Forward Purchaser"). If we enter into a forward sale agreement with the Forward Purchaser, we expect that the Forward Purchaser, acting in accordance with the mutually accepted instructions related to such forward sale agreement, will attempt to borrow and sell, through the manager, acting as agent for the Forward Purchaser, shares of our common stock to hedge the Forward Purchaser's exposure under such forward sale agreement. We refer to the manager, when acting as agent or principal for the Forward Purchaser, as the "Forward Seller." We will not initially receive any proceeds from any sale of shares of our common stock borrowed by the Forward Purchaser and sold through the Forward Seller.

We will report at least quarterly the number of shares of common stock sold through the manager (including as Forward Seller) under the Equity Distribution Agreement, the net proceeds to us (after deduction of the compensation to the manager, or, if applicable, the Forward Purchaser, and any regulatory transaction fees, if any, but before other expenses) and the compensation paid by us to the manager in connection with the sales of shares of our common stock.

The offering of common stock pursuant to the Equity Distribution Agreement will terminate upon the earlier of (1) the sale of all common stock subject to the Equity Distribution Agreement or (2) the termination of the Equity Distribution Agreement by us or by the manager.

In connection with the sale of the shares of common stock on our behalf, the manager may be deemed to be an "underwriter" within the meaning of the Securities Act of 1933, as amended (the "Securities Act"), and the compensation paid to the manager may be deemed to be underwriting commissions or discounts. We have agreed to provide indemnification and contribution to the manager (whether acting as our sales agent, principal or Forward Seller) and Forward Purchaser against certain liabilities, including civil liabilities under the Securities Act.

The manager and its affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, principal investment, hedging, financing and brokerage activities. The manager and its affiliates have provided in the past and may provide from time to time in the future certain commercial banking, financial advisory, investment banking and other services for us for which they will receive customary fees. An affiliate of the manager is a dealer under our commercial paper program and, to the extent that it or its affiliates hold such

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commercial paper, will receive its respective share of any repayment by us of amounts outstanding thereunder. An affiliate of the manager is also a lender under our revolving credit agreement. Affiliates of the manager hold our common stock.

Sales Through the Manager as our Sales Agent or to the Manager as Principal

In connection with any offers of shares of our common stock through the manager, acting as our sales agent, we will designate the maximum number of shares of common stock to be sold on a daily basis or otherwise through the manager as we and the manager agree and the minimum sale price per share of common stock. Subject to the terms and conditions of the Equity Distribution Agreement, the manager will use its reasonable efforts to sell on our behalf all of the designated shares of common stock. We may instruct the manager not to sell any shares of common stock if the sales cannot be effected at or above the price designated by us in any such instruction.

We or the manager may suspend the offering of common stock at any time and from time to time by notifying the other party. The offering of the shares is subject to receipt and acceptance and subject to the manager's right to reject any order in whole or in part.

The manager will provide to us written confirmation following the close of trading on the NYSE each day in which shares of common stock are sold by it as our agent under the Equity Distribution Agreement. Each confirmation provided by the manager will include the number of shares of common stock sold on that day, the aggregate gross sales proceeds, the net proceeds to us (after deduction of the compensation to the manager and any regulatory transaction fees, if any, but before other expenses) and the compensation payable by us to the manager with respect to the manager's sales.

We will pay the manager a commission of up to, but not exceeding, 2.0% of the gross sale price of the shares of common stock sold by the manager pursuant to the Equity Distribution Agreement. We have agreed to reimburse the manager for certain of its expenses.

Under the terms of the Equity Distribution Agreement, we also may sell common stock to the manager as principal for its own account at a price agreed upon at the time of sale. If we sell common stock to the manager as principal, we will enter into a separate agreement with the manager and we will describe such agreement in a separate prospectus supplement or pricing supplement.

Settlement for sales of common stock by the manager will generally occur on the second business day following the date on which any sales were made (or such earlier day as is industry practice for regular-way trading), or on some other date that is agreed upon by us and the manager in connection with a particular transaction, in return for payment of the net proceeds to us. There is no arrangement for funds to be received in an escrow, trust or similar arrangement.

If we or the manager have reason to believe that our common stock is no longer an "actively-traded security" as defined under Rule 101(c)(l) of Regulation M under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), that party will promptly notify the other party and sales of common stock pursuant to the Equity Distribution Agreement or any terms agreement will be suspended until Rule 101(c)(1) or another exemptive provision has been satisfied in the judgment of each party.

Sales Through Forward Seller

If we enter into a forward sale agreement with the Forward Purchaser, we expect that the Forward Purchaser or its affiliate will attempt to borrow from third parties and sell, through the manager, acting as sales agent for the Forward Purchaser, shares of our common stock to hedge the Forward Purchaser's exposure under such forward sale agreement.

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In connection with any forward sale agreement, we will deliver instructions to the manager directing it, as Forward Seller, to offer and sell the applicable borrowed shares of our common stock on behalf of the Forward Purchaser. Such instructions shall specify the maximum number of shares to be sold and the minimum price per share at which such shares may be sold. Subject to, among others, the terms and conditions in the Equity Distribution Agreement and the acceptance of such instructions from us by the manager, the manager has agreed to use its commercially reasonable efforts, consistent with its normal trading and sales practices and applicable laws and regulations, to sell, as Forward Seller for the Forward Purchaser, all of the shares so designated for sale by us in accordance with such instructions, on the terms and subject to the conditions set forth in the Equity Distribution Agreement. We or the manager may at any time immediately suspend the offering of shares of our common stock through the manager, as Forward Seller, upon notice to the other party.

The manager will provide written confirmation to us following the close of trading on the NYSE on each day on which shares of our common stock are sold through it, as Forward Seller, under the Equity Distribution Agreement. Each confirmation will include the number of shares of our common stock sold on that day, the gross offering proceeds received from such sale, the net proceeds and the compensation payable by us to the manager in connection with such sales of our common stock.

In connection with each forward sale agreement, we will pay the manager, acting as Forward Seller in connection with such forward sale agreement, a commission, in the form of a reduction to the initial forward price under the related forward sale agreement, at a rate that shall be up to, but shall not exceed, 2.0% of the gross sales price of the borrowed shares of our common stock sold through the manager, acting as Forward Seller, during the applicable forward selling period for such shares (subject to certain possible adjustments to such gross sales price for daily accruals and any dividends having an "ex-dividend" date during such forward selling period). We may also agree with the manager, acting as Forward Seller, to sell shares of our common stock other than through ordinary brokers' transactions using sales efforts and methods that may constitute "distributions" within the meaning of Rule 100 of Regulation M under the Exchange Act, and for which we may agree to pay the manager a commission, in the form of a reduction to the initial forward price under the related forward sale agreement, that may exceed 2.0% of the gross sales price of our common stock sold through the manager. We sometimes refer to this commission as the "forward seller commission."

We expect that settlement between the Forward Purchaser and the manager, as Forward Seller, for sales of borrowed shares of our common stock, as well as settlement between the manager and buyers of such shares in the market, will occur on the second business day (or on such other date as may be agreed upon by the relevant parties) following the respective dates on which any such sales are made in return for the payment of the net proceeds therefor. There is no arrangement for funds to be received in an escrow, trust or similar arrangement. The obligations of the Forward Purchaser and the manager, acting as Forward Seller, under the Equity Distribution Agreement are subject to a number of conditions, which the Forward Purchaser and manager, respectively, may waive in their sole and absolute discretion.

Pursuant to each forward sale agreement, if any, we will have the right to issue and deliver to the Forward Purchaser party thereto a specified number of shares of our common stock on the terms and subject to the conditions set forth therein, or, alternatively, to elect cash settlement or net share settlement, as described below, for all or any portion of such shares. The initial forward price per share under each forward sale agreement will equal the product of (1) an amount equal to one minus the applicable forward selling commission and (2) the volume weighted average price per share at which the borrowed shares of our common stock were sold pursuant to the Equity Distribution Agreement by the manager, acting as Forward Seller, during the applicable forward selling period for such shares to hedge the Forward Purchaser's exposure under such forward sale agreement (subject to certain possible adjustments for daily accruals and any dividends having an "ex-dividend" date during such forward selling period). Thereafter, the forward price will be subject to the price adjustment provisions of the applicable forward sale agreement, as described in the next paragraph. We will not initially receive any proceeds from any sale of shares of our common stock borrowed by the Forward Purchaser or its affiliate and sold through the Forward Seller, and all of such net proceeds will be paid to the Forward Purchaser (or one or more of its affiliates).

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We currently expect to fully physically settle each forward sale agreement, if any, with the Forward Purchaser on one or more dates specified by us on or prior to the maturity date of such forward sale agreement, although, as discussed below, we will generally have the right, subject to certain exceptions and conditions, to elect cash settlement or net share settlement instead of physical settlement for any of the shares we have agreed to sell under such forward sale agreement. If we elect or are deemed to have elected to physically settle any forward sale agreement by delivering shares of our common stock, we will receive an amount of cash from the Forward Purchaser equal to the product of (1) the forward price per share at such time under such forward sale agreement and (2) the number of shares of our common stock as to which we have elected or are deemed to have elected physical settlement, subject to the price adjustment and other provisions under such forward sale agreement. Each forward sale agreement will provide that the forward price will be subject to adjustment on a daily basis based on a specified floating interest rate factor less a spread. In addition, the forward price will be subject to decrease on certain dates specified in the relevant forward sale agreement by the amount per share of dividends we expect to declare on our common stock during the term of such forward sale agreement. If the specified floating interest rate factor is less than the applicable spread on any day, the interest rate factor will result in a daily reduction of the forward price.

We expect that, before any issuance of shares of our common stock upon physical settlement or net share settlement of any forward sale agreement, the shares issuable upon settlement of such forward sale agreement will be reflected in our diluted earnings per share calculations using the treasury stock method. Under this method, the number of shares of our common stock used in calculating diluted earnings per share and dividends per share will be deemed to be increased by the excess, if any, of the number of shares that would be issued upon physical settlement of such forward sale agreement over the number of shares that could be purchased by us in the market (based on the average market price during the relevant forward selling period specified in such forward sale agreement) using the proceeds receivable upon settlement (based on the adjusted forward price at the end of the relevant reporting period). Consequently, prior to physical or net share settlement of the forward sale agreement and subject to the occurrence of certain events, we anticipate there will be no dilutive effect on our earnings per share as a result of such forward sale agreement except during periods when the average market price of our common stock is above the per share adjusted forward price of such forward sale agreement, subject to increase or decrease based on the specified floating interest rate factor less a spread, and subject to decrease by amounts related to expected dividends on our common stock during the term of that particular forward sale agreement. However, if we decide to physically or net share settle any forward sale agreement, delivery of shares of our common stock by us will result in dilution to our earnings per share.

Except under the circumstances described below and subject to certain conditions in each forward sale agreement, we will generally have the right, in lieu of physical settlement of any forward sale agreement, to elect cash or net share settlement in respect of any or all of the shares of common stock subject to such forward sale agreement. If we elect to cash or net share settle all or any part of any forward sale agreement, we would expect the Forward Purchaser or one of its affiliates to purchase shares of our common stock in secondary market transactions over an unwind period to:

If the price of our common stock at which these purchases by the Forward Purchaser (or its affiliate) are made is below the relevant forward price, the Forward Purchaser will pay us such difference in cash (if we elect to cash settle) or deliver to us shares of our common stock having a market value equal to such difference (if we elect to net share settle). If the price of our common stock at which these purchases are made by the Forward Purchaser (or its affiliate) exceeds the applicable forward price, we will pay the Forward Purchaser an amount in

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cash equal to such difference (if we elect to cash settle) or we will deliver to the Forward Purchaser a number of shares of our common stock having a market value equal to such difference (if we elect to net share settle). Any such difference could be significant and could result in our receipt of a significant amount of cash or number of shares of our common stock from the Forward Purchaser or require us to pay a significant amount of cash or deliver a significant number of shares of our common stock to the Forward Purchaser.

In addition, the purchase of our common stock by the Forward Purchaser or its affiliate to unwind the Forward Purchaser's hedge position could cause the price of our common stock to increase above the price that would have prevailed in the absence of those purchases (or prevent a decrease in such price), thereby increasing the amount of cash (in the case of cash settlement) or the number of shares (in the case of net share settlement) that we may owe the Forward Purchaser upon settlement of the applicable forward sale agreement or decrease the amount of cash (in the case of cash settlement) or the number of shares (in the case of net share settlement) that the Forward Purchaser may owe us upon settlement of the applicable forward sale agreement.

The Forward Purchaser will have the right to accelerate its forward sale agreement (with respect to all or any portion of the transaction under such forward sale agreement that the Forward Purchaser determines is affected by an event described below) and require us to physically settle or, if we so elect and the Forward Purchaser permits our election, cash settle or net share settle on a date specified by the Forward Purchaser if:

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The Forward Purchaser's decision to exercise its right to accelerate all or a portion of the settlement of any forward sale agreement and to require us to physically settle the relevant shares will be made irrespective of our interests, including our need for capital. In such cases, we could be required to issue and deliver shares of our common stock under the terms of the physical settlement provisions of the applicable forward sale agreement irrespective of our capital needs, which would result in dilution to our earnings per share and dividends per share.

In addition, upon certain events of bankruptcy or insolvency relating to us, the forward sale agreements will terminate without further liability of the parties thereto. Following any such termination, we would not issue any shares of our common stock pursuant to such forward sale agreements, and we would not receive any proceeds pursuant to the forward sale agreements. For further information, see "Risk Factors."

The descriptions of certain provisions of the forward sale agreements appearing above and the descriptions of certain provisions of the forward sale agreements that we expect to enter into in connection with this offering appearing elsewhere in this prospectus supplement are not complete and are subject to, and qualified in their entirety by reference to, the terms and provisions of such forward sale agreements. A form of the forward sale agreement is included as an exhibit to the Equity Distribution Agreement.

Relationships/FINRA Conduct Rules

From time to time, the manager and its affiliates have provided, directly or indirectly, investment and commercial banking or financial advisory services to us and our affiliates, for which they have received customary fees and commissions, and they expect to provide these services to us and our affiliates in the future, for which they expect to receive customary fees and commissions.

An affiliate of the manager is a lender under our revolving credit facility and, to the extent we use proceeds from this offering to repay indebtedness under our revolving credit, will receive its share of any repayment of amounts outstanding under such facility with the proceeds of this offering. Additionally, an affiliate of the manager is a dealer under our commercial paper program. To the extent we use proceeds from this offering to repay notes issued under our commercial paper program and such affiliate holds such notes, such affiliate may receive proceeds from this offering.

In the ordinary course of their various business activities, the manager and its affiliates, officers, directors and employees may purchase, sell or hold a broad array of investments and actively traded securities, derivatives, loans, commodities, currencies, credit default swaps and other financial instruments for their own account and for the accounts of their customers, and such investment and trading activities may involve or relate to our assets, securities and/or instruments (directly, as collateral securing other obligations or otherwise) and/or persons and entities with relationships with us. The manager and its affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such assets, securities or instruments and may at any time hold, or recommend to clients that they should acquire, long and/or short positions in such assets, securities and instruments.

If we enter into a forward sale agreement with the Forward Purchaser, we expect that the Forward Purchaser or its affiliate will attempt to borrow from third parties and sell, through the manager, acting as Forward Seller, shares of our common stock to hedge the Forward Purchaser's exposure under such forward sale agreement. All of the net proceeds from the sale of any such borrowed shares will be paid to the Forward Purchaser (or one or more of its affiliates). The Forward Purchaser will be either the manager or an affiliate of the manager. As a result, the manager or its affiliate will receive the net proceeds from any sale of borrowed shares of our common stock made in connection with any forward sale agreements.

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LEGAL MATTERS

The validity of the common stock being offered hereunder is being passed upon for us by GableGotwals, Tulsa, Oklahoma. Certain other legal matters will be passed upon for us by Latham & Watkins LLP, Austin, Texas. The manager and the Forward Purchaser will be represented by Clifford Chance US LLP, Houston, Texas.

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EXPERTS

The financial statements and management's assessment of the effectiveness of internal control over financial reporting (which is included in Management's Report on Internal Control over Financial Reporting) incorporated in this prospectus supplement by reference to the Predecessor's Annual Report on Form 10-K for the year ended December 31, 2025 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

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WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and other reports and other information with the SEC under the Exchange Act. The SEC maintains a website (www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. Our SEC filings are available on the SEC's website. You also can obtain information about us at the offices of the NYSE, located at 11 Wall Street, New York, New York 10005.

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INCORPORATION BY REFERENCE

The SEC allows us to "incorporate by reference" information into this prospectus supplement. This means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be part of this prospectus supplement, and information that we file later with the SEC will automatically update and supersede the previously filed information. We incorporate by reference the documents listed below and any future filings made by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, other than any portions of the respective filings that were furnished, pursuant to Item 2.02 or Item 7.01 of Current Reports on Form 8-K (including exhibits related thereto) or other applicable SEC rules, rather than filed, prior to the consummation of the offering under this prospectus supplement:

If information in incorporated documents conflicts with information in this prospectus supplement, you should rely on the most recent information. If information in an incorporated document conflicts with information in another incorporated document, you should rely on the most recent incorporated document.

Documents incorporated by reference are available from us without charge, excluding any exhibits to those documents unless the exhibit is specifically incorporated by reference as an exhibit in this document. You can obtain documents incorporated by reference in this document by requesting them in writing or by telephone at the following address and phone number:

ONEOK, Inc.

100 West Fifth Street

Tulsa, Oklahoma 74103

Attention: Corporate Secretary

Telephone: (918) 588-7000

We have not authorized anyone to provide you with information other than the information contained or incorporated by reference in this prospectus supplement or the accompanying base prospectus. We are not making an offer to sell, or soliciting an offer to buy, securities in any jurisdiction where the offer and sale is not

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permitted. You should assume that the information appearing or incorporated by reference in this prospectus supplement, the accompanying base prospectus or any applicable pricing supplement is accurate only as of the date of the documents containing the information, regardless of the time of its delivery or of any sale of our securities. Our business, financial condition, results of operations and prospects may have changed since those dates.

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ONEOK, INC.

Debt Securities, Common Stock, Stock Purchase Contracts,

Stock Purchase Contract Units, Preferred Stock, Depositary Shares, and Warrants

ONEOK, L.L.C.

Debt Securities

Guarantee of Debt Securities of ONEOK, L.L.C. by ONEOK, Inc.

ONEOK, Inc. ("ONEOK," "we," "our" or "us") may offer and sell, from time to time in one or more issuances, (1) one or more series of debt securities, which may be senior or subordinated notes or debentures, or other senior or subordinated evidences of indebtedness and which may include terms permitting or requiring holders to convert or exchange their debt securities for common stock, preferred stock or other securities, in each case, of ONEOK, (2) shares of our common stock, (3) stock purchase contracts, (4) stock purchase contract units that consist of (a) a stock purchase contract and (b) senior or subordinated debt securities, or preferred stock, U.S. Treasury securities or other debt obligations of third parties, that may be used to secure the holders' obligations under a purchase contract, (5) shares of our preferred stock, which may include terms permitting or requiring holders to convert or exchange their preferred stock for common stock or other securities, (6) depositary shares, or (7) warrants.

ONEOK, L.L.C. ("OpCo"), an indirect, wholly owned subsidiary of ONEOK, may offer and sell, from time to time in one or more issuances, one or more series of debt securities, which may be senior or subordinated notes or debentures, or other senior or subordinated evidences of indebtedness, which may be fully and unconditionally guaranteed by ONEOK and which may include terms permitting or requiring holders to convert or exchange their debt securities for common stock, preferred stock or other securities, in each case, of ONEOK.

We will provide you with the specific terms of the particular securities being offered in supplements to this prospectus. Any prospectus supplement may also add, update, or change information contained in this prospectus. You should read this prospectus and each related prospectus supplement carefully before you make an investment decision. This prospectus may not be used to sell securities unless accompanied by a prospectus supplement.

Our common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "OKE."

Investing in these securities involves certain risks. Please read "Risk Factors" on page 8 of this prospectus.

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. Any representation to the contrary is a criminal offense.

The date of this Prospectus is September 10, 2026.

TABLE OF CONTENTS

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ABOUT THIS PROSPECTUS

The information contained in this prospectus is not complete and may be changed. We have not authorized anyone else to provide you with information other than the information provided in or incorporated by reference in this prospectus, any prospectus supplement, or documents to which we otherwise refer you. We are not making an offer of any securities in any jurisdiction where the offer is not permitted. You should not assume that the information in this prospectus, any prospectus supplement or any document incorporated by reference is accurate as of any date other than the date of the document in which such information is contained or such other date referred to in such document, regardless of the time of any sale or issuance of a security.

This prospectus is part of a registration statement filed with the Securities and Exchange Commission, or the SEC, by OpCo's Predecessor (as defined in the Explanatory Note), utilizing a "shelf" registration process, and which ONEOK adopted pursuant to Rule 414 under the Securities Act. Under this shelf registration process, we may sell different types of securities described in this prospectus in one or more offerings. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering and the securities offered by us in that offering. The prospectus supplement may also add, update or change information in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the headings "Where You Can Find More Information" and "Incorporation by Reference."

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by reference to the actual documents. Copies of some of the documents referred to herein have been filed or will be filed or incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below in the section entitled "Where You Can Find More Information."

Unless we otherwise indicate or unless the context requires, all references in this prospectus to:

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WHERE YOU CAN FIND MORE INFORMATION

OpCo's predecessor filed a registration statement on Form S-3 with the SEC under the Securities Act of 1933, as amended, or the Securities Act, that registers the securities offered by this prospectus, and which ONEOK has adopted pursuant to Rule 414 under the Securities Act. The registration statement, including the attached exhibits, contains additional relevant information about us. The rules and regulations of the SEC allow us to omit some information included in the registration statement from this prospectus.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website that contains information we file electronically, which you can access over the Internet at www.sec.gov. Our common stock is listed on the New York Stock Exchange (NYSE: OKE). General information about us, 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, is available free of charge through our website at www.oneok.com as soon as reasonably practicable after we electronically file them with, or furnish them to, the SEC. Information on, or accessible through, our website is not incorporated into this prospectus or our other securities filings and is not a part of these filings.

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INCORPORATION BY REFERENCE

The SEC allows us to "incorporate by reference" the information we have filed with the SEC. This means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be part of this prospectus, and information that we file later with the SEC will automatically update and supersede the previously filed information. Our website is www.oneok.com. Information contained on our website is not part of this prospectus, and the inclusion of our website address in this prospectus is an inactive textual reference.

The documents listed below and any future filings made by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, other than any portions of the respective filings that were furnished, pursuant to Item 2.02 or Item 7.01 of Current Reports on Form 8-K (including exhibits related thereto) or other applicable SEC rules, rather than filed, prior to the termination of the offerings under this prospectus are incorporated by reference in this prospectus:

You may request a copy of these filings (other than an exhibit to the filings unless we have specifically incorporated that exhibit by reference into the filing), at no cost, by writing or telephoning us at the following address:

ONEOK, Inc.

100 West Fifth Street

Tulsa, Oklahoma 74103

Attention: Corporate Secretary

Telephone: (918) 588-7000

We have not authorized anyone to provide you with information other than the information contained or incorporated by reference in this prospectus or in any prospectus supplement. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell, or soliciting an offer to buy, securities in any jurisdiction where the offer and sale is not permitted. You should assume that the information appearing or incorporated by reference in this prospectus, the applicable prospectus supplement or any applicable pricing supplement is accurate only as of the date of the documents containing the information, regardless of the time of its delivery or of any sale of our securities. Our business, financial condition, results of operations and prospects may have changed since those dates.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Some of the statements contained in, or incorporated by reference into, this prospectus are forward-looking statements as defined under federal securities laws. The forward-looking statements relate to our anticipated financial performance, liquidity, management's plans, expectations and objectives for our future capital projects and other future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions, potential or pending strategic transactions, the timing thereof and our ability to achieve the intended and projected operational, financial and strategic benefits from any such transactions, and other matters. We make these forward-looking statements in reliance on the safe harbor protections provided under federal securities legislation and other applicable laws. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements and other statements contained in, or incorporated by reference into, this prospectus regarding our environmental, social and other sustainability targets, plans and goals are not an indication that these statements are required to be disclosed in our filings with the SEC, or that we will continue to make similar statements in the same extent or manner in future filings. In addition, historical, current and forward-looking environmental, social and sustainability-related statements may be based on standards and processes for measuring progress that are still developing and that continue to evolve, and assumptions that are subject to change in the future.

Forward-looking statements include the items identified in the preceding paragraphs, the information concerning possible or assumed future results of our operations and other statements contained in, or incorporated by reference into, this prospectus identified by words such as "anticipates," "believes," "continues," "could," "estimates," "expects," "forecasts," "goal," "guidance," "intends," "may," "might," "outlook," "plans," "potential," "projects," "scheduled," "should," "target," "will," "would," and other words and terms of similar meaning.

One should not place undue reliance on forward-looking statements. Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, markets, products, services and prices. In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

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These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements. Other factors could also adversely affect our future results. These and other risks are described in greater detail in Part I, Item 1A, "Risk Factors," in our Annual Report on Form 10-K for the year ended December 31, 2025, and Part II, Item 1A, "Risk Factors," in our Quarterly Report on Form 10-Q for the period ended March 31, 2026, and in our other filings that we make with the SEC, which are available via the SEC's website at www.sec.gov and our website at www.oneok.com. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Any such forward-looking statement speaks only as of the date on which such statement is made, and other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

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ABOUT ONEOK

We are incorporated under the laws of the state of Oklahoma, and our common stock is listed on the New York Stock Exchange under the trading symbol "OKE." Following the Reorganization described in the Explanatory Note, we operate as a holding company, and our operations are conducted through OpCo and its subsidiaries. We deliver energy products and services vital to an advancing world. We are a leading midstream service provider of gathering, processing, fractionation, transportation, storage and marine export services. As one of the largest integrated energy infrastructure companies in North America, we are delivering energy that makes a difference in the lives of people in the U.S. and around the world. Through our approximately 60,000-mile pipeline network, we transport the natural gas, NGLs, Refined Products and crude oil that help meet domestic and international energy demand, contribute to energy security and provide safe, reliable and responsible energy solutions needed today and into the future.

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RISK FACTORS

Before you invest in our securities, you should carefully consider those risk factors included in our most recent Annual Report on Form 10-K, our Quarterly Reports on Form 10-Q and our other filings with the SEC that are incorporated herein by reference and any prospectus supplement or free writing prospectus used in connection with an offering of our securities, as well as the information relating to us identified above under "Cautionary Statement Regarding Forward-Looking Statements."

If any of the risks discussed in the foregoing documents were actually to occur, our business, financial condition, results of operations, or cash flow could be materially adversely affected. In that case, our ability to pay dividends to our shareholders or pay interest on, or the principal of, any debt securities, may be reduced, the trading price of our securities could decline and you could lose all or part of your investment.

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USE OF PROCEEDS

Unless we inform you otherwise in an applicable prospectus supplement, ONEOK or OpCo, as applicable, will use the net proceeds from the sale of the offered securities for general corporate purposes. These purposes may include repayment and refinancing of debt, acquisitions, working capital, capital expenditures and repurchases and redemptions of securities. Pending any specific application, we may initially invest funds in marketable securities or apply them to the reduction of short-term indebtedness.

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DESCRIPTION OF DEBT SECURITIES

ONEOK and OpCo may each offer and sell debt securities from time to time. OpCo may issue debt securities under the indentures filed as exhibits to the registration statement of which this prospectus is a part. OpCo may issue debt securities under one or more supplemental indentures which have been or will be filed as exhibits to the registration statement of which this prospectus is a part. Debt securities issued by either ONEOK or OpCo will be unsecured obligations of the applicable issuer and may be either senior or subordinated debt.

Each indenture is qualified under the Trust Indenture Act of 1939, as amended. You should read the applicable indenture for additional information before you buy any debt securities. The forms of each of the indentures have been filed as exhibits to the registration statement of which this prospectus forms a part.

Each time debt securities are offered, the applicable prospectus supplement will describe the specific terms of the series of debt securities being offered, including, as applicable:

We may sell debt securities at a discount (which may be substantial) below their stated principal amount. The applicable prospectus supplement will describe any material United States federal income tax consequences and other special considerations applicable to any offering of debt securities.

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DESCRIPTION OF GUARANTEE OF DEBT SECURITIES

To the extent provided in a prospectus supplement and either a supplemental indenture or other authorized action, in each case relating to a particular series of debt securities issued by OpCo, ONEOK, and any successor thereto, may fully, irrevocably, unconditionally and absolutely guarantee the due and punctual payment of the principal of, and premium, if any, and interest on such debt securities, and all other amounts due and payable under the applicable indenture and such debt securities by OpCo to the trustee or the holders of such debt securities. The specific terms of any such guarantee, including any provisions permitting a release thereof, will be described in the applicable prospectus supplement and supplemental indenture or other authorized action. ONEOK will not otherwise be subject to the covenants, obligations and duties provided for in the applicable indenture solely in its capacity as guarantor.

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DESCRIPTION OF CAPITAL STOCK

General

We are authorized to issue a total of 1,300,000,000 shares of all classes of capital stock. Of those authorized shares, 1,200,000,000 are shares of common stock, 630,409,203 shares of which were outstanding as of September 8, 2026, and 100,000,000 are shares of preferred stock. Of the authorized preferred stock, there are 20,000,000 shares designated as Convertible Preferred Stock, Series A (none of which was outstanding on September 10, 2026), 30,000,000 shares designated as Convertible Preferred Stock, Series B (none of which was outstanding on September 8, 2026), and 1,000,000 shares designated as Series C Participating Preferred Stock (none of which was outstanding on September 8, 2026).

The additional shares of our authorized stock available for issuance might be issued at times and under circumstances so as to have a dilutive effect on earnings per share and on the equity ownership of the holders of our common stock. The ability of our board of directors to issue additional shares of stock could enhance the board's ability to negotiate on behalf of the shareholders in a takeover situation but could also be used by the board to make a change-in-control more difficult, thereby denying shareholders the potential to sell their shares at a premium and entrenching current management.

The following description is a summary of the material provisions of our capital stock and various provisions of our certificate of incorporation and bylaws. This summary is not intended to be complete and is qualified by reference to the provisions of applicable law and our certificate of incorporation and bylaws included as exhibits to the registration statement of which this prospectus is a part.

Common Stock

As of September 8, 2026, there were 13,987 holders of record. The issued and outstanding shares of common stock are validly issued, fully paid and non-assessable. Subject to any preferential rights of any prior ranking class or series of capital stock, including the preferred stock, holders of our common stock are entitled to receive dividends on that stock, payable either in cash, property or shares out of assets legally available for distribution when, as and if authorized and declared by our board of directors and to share ratably in our assets legally available for distribution to our shareholders in the event of liquidation, dissolution or winding-up. Subject to various exceptions, we will not be able to pay any dividend or make any distribution of assets on shares of our common stock until we pay dividends on any shares of preferred stock then outstanding with dividend or distribution rights senior to our common stock.

Holders of our common stock are entitled to one vote per share on all matters voted on by our shareholders, including the election of directors. Our certificate of incorporation does not provide for cumulative voting for the election of directors, which means that holders of more than one-half of the outstanding shares of our voting securities will be able to elect all of the directors then standing for election and holders of the remaining shares will not be able to elect any director.

Our board of directors may make rules and regulations concerning the transfer of shares of our common stock from time to time, in accordance with our bylaws.

Holders of our common stock will have no conversion, sinking fund or redemption rights.

Some provisions of the Oklahoma General Corporation Act, our certificate of incorporation and our bylaws may discriminate against holders of a substantial amount of the shares of our common stock. See "-Oklahoma Law" and "-Certificate of Incorporation and Bylaws." Similarly, some provisions of our certificate of incorporation and our bylaws may have the effect of delaying, deferring or preventing a change-in-control with respect to an extraordinary corporate transaction, such as a merger, reorganization, tender offer, sale or transfer of substantially all of our assets.

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Preferred Stock

Our board of directors is authorized to issue shares of preferred stock, in one or more series or classes, and to fix for each series or class the preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends, qualifications, or terms or redemption, as are permitted by Oklahoma law and as are stated in the resolution or resolutions adopted by the board providing for the issuance of shares of that series or class.

Our board has authorized series designated as Convertible Preferred Stock, Series A, Convertible Preferred Stock, Series B and Series C Participating Preferred Stock.

When we offer to sell a particular series of preferred stock, we will describe the specific terms of the securities in a supplement to this prospectus. The prospectus supplement will also indicate whether the terms and provisions described in this prospectus apply to the particular series of preferred stock. The preferred stock will be issued under a certificate of designations relating to each series of preferred stock. The issuance of our preferred stock is also subject to our certificate of incorporation.

Preemptive Rights

No holder of any shares of any class of our stock has any preemptive or preferential right to acquire or subscribe for any unissued shares of any class of stock or any unauthorized securities, convertible into or carrying any right, option or warrant to subscribe for or acquire shares of any class of stock.

Oklahoma Law

Oklahoma Takeover Statute

We are subject to Section 1090.3 of the Oklahoma General Corporation Act. In general, Section 1090.3 prevents an "interested shareholder" from engaging in a "business combination" with an Oklahoma corporation for three years following the date that person became an interested shareholder, unless:

Section 1090.3 defines a "business combination" to include:

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For purposes of the description above and Section 1090.3, the term "corporation" also includes a corporation's majority-owned subsidiaries. In addition, Section 1090.3, defines an "interested shareholder" as an entity or person beneficially owning 15% or more of a corporation's outstanding voting stock and any entity or person affiliated with or controlling or controlled by that entity or person.

Oklahoma Control Share Provisions

Our certificate of incorporation provides that we are not subject to the control share provisions of the Oklahoma General Corporation Act. With exceptions, these provisions prevent holders of more than 20% of the voting power of the stock of an Oklahoma corporation from voting their shares. If we were to become subject to the control share provisions of the Oklahoma General Corporation Act in the future, this provision may delay the time it takes anyone to gain control of us.

Certificate of Incorporation and Bylaws

Exculpation

Our certificate of incorporation provides that our directors and officers will not be personally liable for monetary damages for any action taken, or any failure to take any action, unless:

Indemnification

We will generally indemnify any person who was, is, or is threatened to be made, a party to a proceeding by reason of the fact that he or she:

Any indemnification of our directors, officers or others pursuant to the foregoing provisions for liabilities arising under the Securities Act is, in the opinion of the SEC, against public policy as expressed in the Securities Act and is therefore unenforceable.

Shareholder Action; Special Meeting of Shareholders

Our certificate of incorporation eliminates the ability of our shareholders to act by written consent. Our bylaws provide that special meetings of our shareholders may be called only by a majority of the members of our board of directors.

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Advance Notice Requirements for Shareholder Proposals

At any annual meeting of our shareholders, the only business that shall be brought before the meeting is that which is brought:

For business to be properly brought before an annual meeting by a shareholder pursuant to the immediately preceding clause, the shareholder must have given timely notice in writing to our secretary. To be timely as to an annual meeting of shareholders, a shareholder's notice must be received at our principal executive offices not less than 120 calendar days or more than 150 calendar days before the date our proxy statement is released to shareholders in connection with the previous year's annual meeting; provided however, that if the date of the meeting is changed by more than 30 days from the date of the previous year's meeting, notice must be received no later than the close of business on the 10th day following the earlier of the day on which notice of the date of the meeting was mailed to shareholders or public disclosure of that date was made. The shareholder notice shall set forth as to each matter the shareholder proposes to bring before the meeting:

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These provisions may impede shareholders' ability to bring matters before an annual meeting of shareholders.

Higher Vote for Some Business Combinations and Other Actions

Subject to various exceptions, including acquiring 85% of the outstanding shares less shares owned by related persons in a single transaction, a business combination (including, but not limited to, a merger or consolidation, the sale, lease, exchange, mortgage, pledge, transfer or other disposition of our assets in excess of $5,000,000, various issuances and reclassifications of securities and the adoption of a plan or proposal for liquidation or dissolution) with or upon a proposal by a related person, who is a person that is the direct or indirect beneficial owner of more than 10% of the outstanding voting shares of our stock (subject to various exceptions), and any affiliates of that person, shall require, in addition to any approvals required by law, the approval of the business combination by either:

In addition, our certificate of incorporation provides that our bylaws may only be adopted, amended or repealed by a majority of the board of directors or by 80% of our shareholders, voting as a class. Our certificate of incorporation also requires the affirmative vote of 80% of our shareholders to amend, repeal or adopt provisions in our certificate of incorporation relating to, among other things,

Transactions with Interested Parties

Our certificate of incorporation provides that, in the absence of fraud, no contract or other transaction will be affected or invalidated by the fact that any of our directors are in any way interested in or connected with any other party to the contract or transaction or are themselves parties to the contract or transaction, provided that the interest is fully disclosed or otherwise known to our board of directors at the meeting of the board at which the contract or transaction is authorized or confirmed, and provided further that a quorum of disinterested directors is present at the meeting of our board of directors authorizing or confirming the contract or transaction and the contract or transaction is approved by a majority of the quorum, and no interested director votes on the contract or transaction. Any contract, transaction or act entered into or taken by us or our board or any committee thereof that is ratified by a majority of a quorum of the shareholders having voting power at any annual meeting, or any special meeting called for that purpose, will be valid and binding as though ratified by all of our shareholders. Any director may vote upon any contract or other transaction between us and any subsidiary corporation without regard to the fact that he or she is also a director of that subsidiary corporation. No contract or agreement

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between us and any other corporation or party that owns a majority of our capital stock or any subsidiary of that other corporation shall be made or entered into without the affirmative vote of a majority of the whole board of directors at a regular meeting of the board.

Transfer Agent and Registrar

The current transfer agent and registrar for our common stock is Equiniti Trust Company, LLC ("Equiniti" or "EQ").

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DESCRIPTION OF STOCK PURCHASE CONTRACTS

AND STOCK PURCHASE CONTRACT UNITS

We may issue stock purchase contracts for the purchase of our securities or securities of an entity unaffiliated or affiliated with us, a basket of such securities or any combination of the above as specified in the applicable prospectus supplement. Each stock purchase contract will entitle the holder thereof to purchase, and obligate us to sell, on specified dates, such securities, at a specified purchase price, all as set forth in the applicable prospectus supplement. The applicable prospectus supplement will also specify the methods by which the holders may purchase such securities, any acceleration, cancellation or termination provisions or other provisions relating to the settlement of a stock purchase contract and, if applicable, the identity of any of our subsidiaries guaranteeing our obligations with respect to such stock purchase contracts. Stock purchase contracts may require holders to satisfy their obligations thereunder when the stock purchase contracts are issued. Our obligation to settle such prepaid stock purchase contracts on the relevant settlement date may constitute indebtedness. Accordingly, the prepaid stock purchase contracts will be issued under one of the Indentures. The stock purchase contracts may be issued separately or as part of a stock purchase contract unit that consists of (a) a stock purchase contract and (b) senior or subordinated debt securities, or preferred stock, U.S. Treasury securities or other debt obligations of third parties, that may be used to secure the holders' obligations under a stock purchase contract. The stock purchase contracts may require us to make periodic payments to the holders of the stock purchase contract units, and such payments may be unsecured or prefunded on some basis. The stock purchase contracts may require holders to secure their obligations in a specified manner and, in certain circumstances, we may deliver newly issued prepaid stock purchase contracts upon release to a holder of any collateral securing such holder's obligations under the original stock purchase contract.

The applicable prospectus supplement will describe the general terms of any stock purchase contracts or stock purchase contract units and, if applicable, prepaid stock purchase contracts. The description in the prospectus supplement will not purport to be complete and will be qualified in its entirety by reference to (a) the stock purchase contracts, (b) the collateral arrangements and depository arrangements, if applicable, relating to such stock purchase contracts or stock purchase contract units and (c) if applicable, the prepaid stock purchase contracts and the documents pursuant to which such prepaid stock purchase contracts will be issued. Some of the material United States federal income tax considerations applicable to the stock purchase contracts and the stock purchase contract units will also be discussed in the applicable prospectus supplement.

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DESCRIPTION OF DEPOSITARY SHARES

General

We may, at our option, elect to offer fractional shares of preferred stock, rather than full shares of preferred stock. If we exercise this option, we will issue to the public receipts for depositary shares, and each of these depositary shares will represent a fraction (to be set forth in the applicable prospectus supplement) of a share of a particular series of preferred stock.

The shares of any series of preferred stock underlying the depositary shares will be deposited under a deposit agreement between us and a bank or trust company selected by us. The depositary will have its principal office in the United States and a combined capital of at least $50,000,000. Subject to the terms of the deposit agreement, each owner of a depositary share will be entitled, in proportion, to the applicable fraction of a share of preferred stock underlying that depositary share, to all the rights and preferences of the preferred stock underlying that depositary share. Those rights (to be set forth in the applicable prospectus supplement) include dividend, voting, redemption and liquidation rights.

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. Depositary receipts will be distributed to those persons purchasing the fractional shares of preferred stock underlying the depositary shares, in accordance with the terms of the offering. Copies of the forms of deposit agreement and depositary receipt will be filed as exhibits to the registration statement. The following summary of the deposit agreement, the depositary shares and the depositary receipts is not complete. You should refer to the forms of the deposit agreement and depositary receipts that will be filed with the SEC in connection with the offering of the specific depositary shares.

Pending the preparation of definitive engraved depositary receipts, the depositary may, upon our written order, issue temporary depositary receipts substantially identical to the definitive depositary receipts but not in definitive form. These temporary depositary receipts entitle their holders to all the rights of definitive depositary receipts which are to be prepared without unreasonable delay. Temporary depositary receipts will then be exchangeable for definitive depositary receipts at our expense.

Dividends and Other Distributions

The depositary will distribute all cash dividends or other cash distributions received with respect to the preferred stock to the record holders of depositary shares relating to the preferred stock in proportion to the number of depositary shares owned by those holders.

If there is a distribution other than in cash, the depositary will distribute property received by it to the record holders of depositary shares that are entitled to receive the distribution, unless the depositary determines that it is not feasible to make the distribution. If this occurs, the depositary may, with our approval, sell the property and distribute the net proceeds from the sale to the applicable holders.

Redemption of Depositary Shares

If a series of preferred stock represented by depositary shares is subject to redemption, the depositary shares will be redeemed from the proceeds received by the depositary resulting from the redemption, in whole or in part, of that series of preferred stock held by the depositary. The redemption price per depositary share will be equal to the applicable redemption fraction of the redemption price per share payable with respect to that series of the preferred stock. Whenever we redeem shares of preferred stock that are held by the depositary, the depositary will redeem, as of the same redemption date, the number of depositary shares representing the shares of preferred stock so redeemed. If fewer than all the depositary shares are to be redeemed, the depositary shares to be redeemed will be selected by lot or pro rata as may be determined by the depositary.

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Voting the Preferred Stock

Upon receipt of notice of any meeting at which the holders of the preferred stock are entitled to vote, the depositary will mail the information contained in such notice to the record holders of the depositary shares underlying the preferred stock. Each record holder of the depositary shares on the record date, which will be the same date as the record date for the preferred stock, will be entitled to instruct the depositary as to the exercise of the voting rights pertaining to the amount of the preferred stock represented by the holder's depositary shares. The depositary will then try, as far as practicable, to vote the number of shares of preferred stock underlying those depositary shares in accordance with such instructions. We will agree to take all actions which may be deemed necessary by the depositary to enable the depositary to do so. The depositary will not vote the shares of preferred stock to the extent it does not receive specific instructions from the holders of depositary shares underlying the preferred stock.

Amendment and Termination of the Depositary Agreement

The form of depositary receipt evidencing the depositary shares and any provision of the deposit agreement may at any time be amended by agreement between us and the depositary. However, any amendment which materially and adversely alters the rights of the holders of depositary shares will not be effective unless the amendment has been approved by the holders of at least a majority of the depositary shares then outstanding. The deposit agreement may be terminated by us or by the depositary only if (a) all outstanding depositary shares have been redeemed or (b) there has been a final distribution of the underlying preferred stock in connection with our liquidation, dissolution or winding up and the preferred stock has been distributed to the holders of depositary receipts.

Charges of Depositary

We will pay all transfer and other taxes and governmental charges arising solely from the existence of the depositary arrangements. We will also pay charges of the depositary in connection with the initial deposit of the preferred stock and any redemption of the preferred stock. Holders of depositary receipts will pay other transfer and other taxes and governmental charges and those other charges, including a fee for the withdrawal of shares of preferred stock upon surrender of depositary receipts, as are expressly provided in the deposit agreement to be for their accounts.

Miscellaneous

The depositary will forward to holders of depositary receipts all reports and communications from us that we deliver to the depositary and that we are required to furnish to the holders of the preferred stock.

Neither we nor the depositary will be liable if either of us is prevented or delayed by law or any circumstance beyond our control in performing our respective obligations under the deposit agreement. Our obligations and those of the depositary will be limited to performance in good faith of our respective duties under the deposit agreement. Neither we nor the depositary will be obligated to prosecute or defend any legal proceeding in respect of any depositary shares or preferred stock unless satisfactory indemnity is furnished. We and the depositary may rely upon written advice of counsel or accountants, or upon information provided by persons presenting preferred stock for deposit, holders of depositary receipts or other persons believed to be competent and on documents believed to be genuine.

Resignation and Removal of Depositary

The depositary may resign at any time by delivering notice to us of its election to resign. We may remove the depositary at any time. Any resignation or removal will take effect upon the appointment of a successor depositary and its acceptance of the appointment. The successor depositary must be appointed within 60 days after delivery of the notice of resignation or removal and must be a bank or trust company having its principal office in the United States and having a combined capital and surplus of at least $50,000,000.

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DESCRIPTION OF WARRANTS

We may issue warrants for the purchase of debt securities, preferred stock, common stock, or units of two or more of these types of securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank or trust company, as warrant agent. The warrant agent will act solely as our agent in connection with the warrants and will not assume any obligation or relationship of agency or trust for or with any registered holders of warrants or beneficial owners of warrants.

We will distribute a prospectus supplement with regard to each issue of warrants. Each prospectus supplement will describe:

Warrants for the purchase of preferred stock and common stock will be offered and exercisable for U.S. dollars only. Warrants will be issued in registered form only. The exercise price for warrants will be subject to adjustment as described in the applicable prospectus supplement.

Prior to the exercise of any warrants to purchase debt securities, preferred stock or common stock, holders of the warrants will not have any of the rights of holders of the debt securities, preferred stock or common stock purchasable upon exercise, including:

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PLAN OF DISTRIBUTION

We will set forth in the applicable prospectus supplement a description of the plan of distribution of our securities that may be offered pursuant to this prospectus.

LEGAL MATTERS

The validity of the securities being offered hereby will be passed upon for us by GableGotwals, Tulsa, Oklahoma, except that Latham & Watkins LLP, Austin, Texas, will pass upon such matters to the extent governed by New York law.

EXPERTS

The financial statements and management's assessment of the effectiveness of internal control over financial reporting (which is included in Management's Report on Internal Control over Financial Reporting) incorporated in this Prospectus by reference to the Predecessor's Annual Report on Form 10-K for the year ended December 31, 2025 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

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Common Stock

Having an Aggregate Offering Price of Up to

$1,000,000,000

PROSPECTUS SUPPLEMENT

BofA Securities

September 15, 2026