Summary Prospectus by Investment Company (Form 497K)

December 17, 2025

Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus and other information about the Fund online at www.gafunds.com/fundinfo. You may also obtain this information at no cost by calling 1-866-307-5990 or by sending an e-mail request to [email protected]. The Fund's Statutory Prospectus and Statement of Additional Information, both dated December 17, 2025, are incorporated by reference into this Summary Prospectus.

Investment Objective

Guinness Atkinson US Dividend Builder ETF seeks a moderate level of current income.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of Guinness Atkinson US Dividend Builder ETF. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.

​(1) The Fund's advisory agreement provides that in exchange for a unitary fee, the Adviser will arrange for and pay for all routine and ordinary expenses of the Fund except for: the management fees, Rule 12b-1 plan payments (if any), interest expenses, taxes, fees related to services for reclamation or collection of foreign taxes withheld, acquired fund fees and expenses (if any), dividends on short positions, costs of shareholder meetings and extraordinary expenses (including litigation, if any). The Adviser has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, fees related to services for reclamation or collection of foreign taxes withheld, interest, taxes, dividends on short positions, brokerage commissions, and extraordinary expenses) in order to limit the Fund's total annual operating expenses to 0.35% through June 30, 2027.

Example

This Example is intended to help you compare the cost of investing in Guinness Atkinson US Dividend Builder ETF with the cost of investing in other investment companies. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. This Example does not include brokerage commissions that you may pay to buy and sell shares. Although your actual costs may be higher or lower, under these assumptions, your costs would be:

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Guinness Atkinson US Dividend Builder ETF shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. The Fund has no operating history and therefore has no portfolio turnover information.

Principal Investment Strategies

The Guinness Atkinson US Dividend Builder ETF will invest at least 80% of its net assets (plus any borrowings for investment purposes) in publicly-traded equity securities issued by dividend-paying companies that the Adviser believes have the ability to consistently increase their dividend payments over the medium term (three to five years). Equity Securities may include common stocks, preferred stocks, securities convertible into common stocks, rights and warrants. The Adviser uses fundamental analysis to assess a company's ability to maintain consistent, real (after inflation) dividend growth. One key measure of a company's ability to achieve consistent, real dividend growth is its consistency in generating returns on capital, which is a measure of income produced by a company when compared to capital invested in the company's operations. In the Adviser's view, "dividend builder" refers to a dividend-paying company which the Adviser believes will experience increasing dividends over time. The Adviser seeks to invest in companies that have returned a real cash flow (cash flow adjusted for inflation) on investment of at least 10% for each of the last 10 years and, in the opinion of the Adviser, are likely to grow their dividend over time; however, this is one of several criteria used by the Adviser and it is possible that not all investments may meet this criterion. The Fund will not change this strategy unless it gives shareholders at least 60 days' notice.

The Fund is actively managed, meaning that the Adviser will select the Fund's holdings based on its judgment and analysis of a company's activities. In determining whether to buy or sell a portfolio position, the Adviser uses proprietary and independent research and applies traditional fundamental analysis to assess a company's business and business prospects, market capitalization, the valuation of the company, its dividend history, its ratio of debt to equity and its potential for share price appreciation or return and for consistent, real (after inflation) dividend growth while maintaining company value.

Typically, the Fund will hold around 30-35 positions of approximately equal weight, but the portfolio may vary over time. Under normal market conditions, the Fund may have as few as 25 holdings, or may hold securities in 75 or more companies. The Fund may invest in companies of any capitalization size.

The Fund will invest in domestic companies, meaning that it will primarily hold companies economically tied to the United States. The Fund's allocations may vary depending on changing market conditions (including but not limited to, liquidity, volatility, and the number of companies meeting selection criteria). Additional information on Principal Investment Strategies can be found in the prospectus. For more information about how the Adviser determines that a company is economically tied a particular country, see "More About the Fund's Investment Strategies and Risks" in this Prospectus. Also see Additional Investment Strategies and Risks in the Statement of Additional Information.

For temporary defensive purposes, any portion of the Fund's total assets may be invested in cash and cash equivalents, including money market funds, to respond to adverse market, economic, political or other conditions. While the Fund is applying this temporary defensive strategy, it may be unable to achieve its investment objective.

The Fund is designed for investors who seek a moderate level of current income and investments in dividend paying companies that have the ability to increase their dividends consistently over time.

Additional information on Principal Investment Strategies can be found in the prospectus. Also see Additional Investment Strategies and Risks in the Statement of Additional Information.

Principal Risks

You can lose money by investing in shares of Guinness Atkinson US Dividend Builder ETF. There can be no assurance that the Fund will achieve its investment objective. Risks associated with an investment in the Fund can increase during times of market volatility. There can be no assurance that the Fund will achieve its investment objective.

The Fund is subject to the following risks, which could affect the Fund's net asset value per share ("NAV"), trading price, yield, total return or the Fund's ability to meet its investment objective. These risks are also described in the "Principal Risks" and "Risks of Investing in Our Fund" sections of this prospectus and in the Fund's Statement of Additional Information. You can lose money by investing in shares of this Fund.

• Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase.

• U.S. Securities Risk. The Fund invests in securities of issuers economically tied to the U.S. This means the Fund's investments are subject to legal, regulatory, political, currency, security and economic risks that are specific to the U.S., including changes in the U.S. economy, interest rates, taxes or tariffs, or changes in U.S. financial markets including their integration into the global interconnected markets.

• Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company's financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events.

• Market Risk. General market conditions can affect the value of the Fund's securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced periods of extreme stress (sometimes related to specific events) which resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Although the Fund invests in U.S. securities, global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short-term volatility of the Fund.

• Global Risks. The Fund invests primarily in companies in the U.S. or economically tied to the U.S. Companies economically tied to countries outside the U.S. and U.S. companies that have exposure to non-U.S. companies, may face global risks. The Fund may invest in or be exposed to companies that are exposed to more global risks. Economies and financial markets globally are increasingly interconnected, which means that events or conditions in one locale can affect markets or companies in other countries or regions. Companies in which the Fund invests may experience differing outcomes with respect to inflation or deflation, interest rates, safety and security, economic uncertainties (including taxes, tariffs and import/export controls), natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company's country or region, including supply chain events, sanctions or embargoes). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company's principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets.

o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants or viruses is uncertain and could adversely affect companies in the Fund's portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield.

o Capital Controls and Sanctions Risk. Beginning in 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia's invasion of Ukraine. The range of sanctions (direct and secondary) and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, and also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact companies in the Fund's portfolio, which could adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value.

Other Principal Risks

• Management Risk. The Fund's strategy may not achieve its investment objective; the portfolio managers' qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy.

• Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US $1 billion), medium cap (under US $5 billion) and large cap (US $10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies.

• Liquidity Risk. The Funds invest in securities, which may become illiquid, and there is liquidity risk associated with a Fund's own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund's books. Investments that become illiquid may be more difficult to value. Illiquidity in portfolio securities could cause a Fund's shares to trade at a premium or discount. The Funds have adopted a liquidity risk management program to manage liquidity risk of each Fund's underlying portfolio.

• Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company's ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund's service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective.

Risks of Investing in ETFs

• Shares May Trade At Prices Other Than NAV. "ETF Shares" are the Fund's individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund's NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount).

o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund's NAV per share, which is calculated only once per day, at the end of the day.

o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the "bid" price) and the price at which investors are willing to sell ETF Shares (the "ask" price) is called the "spread." The spread with respect to ETF shares varies over time based on the Fund's trading volume and market liquidity, and is generally lower (or "narrower") if the Fund has a lot of trading volume and market liquidity and higher (or "wider") if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the Fund's NAV when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund's NAV.

o Information about the Fund's spread. The Fund's website will contain information about each Fund's per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund's premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount.

• Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund's portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences.

• Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV.

• Absence of Active Trading Market Risk. Although Fund Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund Shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or "step away" from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund's market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of the ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted

if individual or market-wide "circuit breakers" are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of ETF shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share.

• Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Funds may engage in creation or redemption transactions. If the Fund's Authorized Participants decide not to create or redeem shares, ETF Shares may trade at a premium or discount to the Fund's net asset value. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund's share price could trade at a discount to NAV and could face trading halts or de-listing.

For more information on the risks of investing in this Fund, please see the Principal Risks and Additional Risks of Investing in Our Funds in the prospectus. You may also refer to the section Risk Factors and Special Considerations in the Statement of Additional Information.

Bar Chart and Performance Information

No performance information is presented for the Fund because it has not yet been in operation for a full calendar year.

Investment Adviser

Guinness AtkinsonTM Asset Management, Inc. serves as the Fund's investment adviser. For more information on the Investment Adviser, please see Management of the Funds in the prospectus and The Investment Adviser in the Statement of Additional Information.

Portfolio Managers

Edmund Harriss is the portfolio manager of the Fund and is primarily responsible for the day-to-day management of the Fund's portfolio.

For additional information, please see Portfolio Management in the prospectus and Portfolio Managers in the Statement of Additional Information.

Purchase and Sale of Fund Shares

Guinness Atkinson US Dividend Builder ETF is traded on the NYSE Arca exchange. Individual Fund shares may only be bought and sold in the secondary market (the exchange) through a broker or dealer at a market price. If you wish to purchase or sell Fund shares, you should contact your broker. You may incur a brokerage fee when purchasing or selling Fund shares. Because Fund shares trade on an exchange at a market price rather than at the net asset value, Fund shares may trade at a price greater than net asset value (premium) or less than net asset value (discount). You may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase Fund shares (bid) and the lowest price a seller is willing to accept for Fund shares (ask) when buying or selling shares in the secondary market (the "bid-ask spread").

Information about the Fund's net asset value, market price, premiums and discounts, and bid-asks spreads are available on the Fund's website at www.gafunds.com.

Only certain large investors that have contractually agreed to be, and have been designated as, Authorized Participants are able to purchase and redeem large blocks of ETF shares directly with the Fund. Purchase and redemption activity conducted by Authorized Participants directly with the Fund will be done in increments of 10,000 share Creation Units. A Transaction Fee of $50 per Creation Unit transaction is charged to Authorized Participants who create or redeem shares in Creation Units, regardless of the number of Creation Units purchased or redeemed by the Authorized Participant on a business day. The Fund will issue or redeem Creation Units in return for a basket of assets that the Fund specifies each day and are effected at the net asset value ("NAV") next determined after the receipt of an order in proper form. The value of the minimum initial or subsequent investment by an Authorized Participant varies with the value of the basket of assets specified by the Fund each day. Fund shares may only be purchased or redeemed in Creation Units by submitting an order to the Fund's transfer agent. More information about the purchase and sale of ETF Shares in Creation Units can be found in the Fund's Statement of Additional Information under "Purchase and Redemption of Shares in Creation Units".

Tax Information

The Fund intends to make distributions that will be taxable, and will be taxed as ordinary income or capital gains, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account. Withdrawals from such tax-deferred arrangements may be taxable at the time of withdrawal. For additional information, please see Distributions and Taxes in the prospectus and Tax Matters in the Statement of Additional Information.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase Fund shares through a broker-dealer or other financial intermediary (such as a bank), the Adviser and its related companies may pay the intermediary for services related to the sale of Fund shares, which include participation in activities designed to inform intermediaries about the Fund, as well as marketing, education and training initiatives concerning the Fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary or your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.