Before you invest, you may want to review the Grayscale Artificial Intelligence Infrastructure ETF (the “Fund”) statutory prospectus and statement of additional information, which contain more information about the Fund and its risks. The current statutory prospectus and statement of additional information dated June 3, 2025 are incorporated by reference into this Summary Prospectus. You can find the Fund’s statutory prospectus, statement of additional information, reports to shareholders, and other information about the Fund online at https://etfs.Grayscale.com/grai. You can also get this information at no cost by calling at 866-775-0131 or by sending an e-mail request to info@grayscale.com.

Grayscale Artificial Intelligence Infrastructure ETF Summary

Investment Objective

The Grayscale Artificial Intelligence Infrastructure ETF (the “Fund”) seeks investment results that track the performance (before fees and expenses) of the VettaFi AI Infrastructure Index (the “Index”).

Fees and Expenses of the Fund

The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). 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.

*  Estimated for the current fiscal year.

Expense Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. 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. The Example does not take into account brokerage commissions that you may pay on your purchases and sales of Shares. Although your actual costs may be higher or lower, based on 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 Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund has not yet commenced investment operations, no portfolio turnover information is available at this time.

Principal Investment Strategy

Under normal circumstances, the Fund will invest at least 80% of its net assets (including investment borrowings) in the constituents that comprise the Index and in other instruments that have economic characteristics and provide investment exposure similar to the component securities of the Index. Other instruments that have economic characteristics and provide investment exposure similar to the

Sources used to analyze the relative strength of these dimensions across the universe of relevant securities include regulatory filings, including but not limited to 10-K’s, 10-Q’s, 8-K’s, and annual reports, and company disclosures (websites, earnings calls, management discussion publications, and CEO commentary publications). For Revenue Purity, the process involves the assessment of the proportion of a company’s income derived directly from activities within the assigned Artificial Intelligence Infrastructure segments. Analysis for Revenue Purity involves dissection of financial statements to quantify revenues from AI operations. This quantitative focus ensures precise measurement of a company’s financial alignment with the AI theme. The Investments factor evaluates a company’s commitment of capital, R&D, and human resources to AI-related growth areas. The analysis scrutinizes R&D expenditure, M&A activity, and strategic capital allocations detailed in financial reports and management discussions. Market Leadership analysis seeks to gauge a company’s competitive standing, including market share, strategic partnerships, and executive team strength within AI segments. In addition, the Index seeks to assess competitive advantages (“moats”), customer adoption as evidenced by case studies and peer performance. Analysis for Technology Leadership evaluates a company’s innovation and technological capabilities, such as its technical moats and patent strength in AI. This process includes an intensive review of technical documentation like white papers, product demonstrations, and patent portfolios to gauge innovation and development pace. The aggregate of this review process determines companies that are leading players in at least one of the six infrastructure segments and eligible for the Index.

The Index is reconstituted and rebalanced quarterly at the close of trading on the third Friday of the month (“Reconstitution Dates” and “Rebalance Dates”) of each March, June, September, and December. Reconstitutions and rebalances are based on data as of the close of the last trade date of the month preceding the reconstitution and rebalance month (“Reference Dates”). Pricing used in share weights used for reconstitutions are based on data as of close of trading on the second Friday of the reconstitution and rebalance month (“Weight Date”).

Constituents that comprise of the Index are float-market cap weighted. Segments weights are capped at 20% while individual constituent weights are capped at 5% with a minimum weight of 0.50% assigned to constituents. Excess weights are distributed proportionately.

The Fund generally employs a “passive management” investment strategy in seeking to achieve its investment objective and fully replicate the Index. However, under various circumstances, the Fund may use a representative sampling strategy, whereby the Fund would invest in what it believes to be a representative sample of the component securities of the Index. The Fund may use a representative sampling strategy when a replication strategy might be detrimental to shareholders, such as when there are practical difficulties or substantial costs involved in compiling a portfolio of securities to follow the Index; or, in certain instances, when a component security of the Index becomes temporarily illiquid, unavailable or less liquid. The Fund may also use a representative sampling strategy to exclude less liquid component securities contained in the Index from the Fund’s portfolio in order to create a more tradable portfolio and improve arbitrage opportunities. To the extent the Fund uses a representative sampling strategy, it may not track the Index with the same degree of accuracy as would an investment vehicle replicating the entire Index.

The Fund may invest in small-, mid- and large-capitalization companies.

The Fund may lend securities representing up to one-third of the value of the Fund’s total assets (including the value of the collateral received).

The Fund is “non-diversified” under the Investment Company Act of 1940, as amended (“1940 Act”), and therefore is not required to meet certain diversification requirements under the 1940 Act.

Concentration Policy. The Fund may concentrate its investments (i.e., invest 25% or more of the value of its total assets) in a particular industry or group of industries to the extent that the Index concentrates in an industry or group of industries. As of April 30, 2025, the Index had approximately 67.6% allocated to the Information Technology sector. The Fund’s portfolio holdings, and the extent to which it concentrates its investments, are likely to change over time.

Principal Investment Risks

The principal risks of investing in the Fund are summarized below. The principal risks below are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objective. For more information about the risks of investing in the Fund, see the section in the Fund’s Prospectus titled “ADDITIONAL INFORMATION ABOUT THE FUND.”

•     Artificial Intelligence Infrastructure Company Risk. Companies that are developing artificial intelligence infrastructure and related technologies that seek to disrupt or displace established industry solutions generally face competition from much larger and more established firms. Such companies may not be able to capitalize on their disruptive technologies if they face political and/or

legal attacks from competitors, industry groups or local and national governments. Laws generally vary by country, creating some challenges to achieving scale. An artificial intelligence infrastructure company may not currently derive any revenue, and there is no assurance that such company will derive any revenue, from artificial intelligence infrastructure and related technologies and activities in the future. Additionally, artificial intelligence infrastructure companies may be adversely impacted by potential rapid product obsolescence, cybersecurity attacks, increased regulatory oversight and disruptions in the technology they depend on. Artificial intelligence infrastructure companies may use one or more digital assets as part of their business activities or hold digital assets as proprietary investments.

•   Currency Exchange Rate Risk. The Fund may invest a relatively large percentage of its assets in investments denominated in non-U.S. currencies or in securities that provide exposure to such currencies. Changes in currency exchange rates and the relative value of non-U.S. currencies will affect the value of the Fund’s investments and the value of your Shares. Because the Fund’s NAV is determined on the basis of U.S. dollars, the U.S. dollar value of your investment in the Fund may go down if the value of the local currency of the non-U.S. markets in which the Fund invests depreciates against the U.S. dollar. This is true even if the local currency value of securities in the Fund’s holdings goes up. Conversely, the dollar value of your investment in the Fund may go up if the value of the local currency appreciates against the U.S. dollar. The value of the U.S. dollar measured against other currencies is influenced by a variety of factors. These factors include: national debt levels and trade deficits, changes in balances of payments and trade, domestic and foreign interest and inflation rates, global or regional political, economic or financial events, monetary policies of governments, actual or potential government intervention, and global energy prices. Political instability, the possibility of government intervention and restrictive or opaque business and investment policies may also reduce the value of a country’s currency. Government monetary policies and the buying or selling of currency by a country’s government may also influence exchange rates. Currency exchange rates can be very volatile and can change quickly and unpredictably. As a result, the value of an investment in the Fund may change quickly and without warning and you may lose money.

•   Depositary Receipt Risk. Depositary Receipts involve risks similar to those associated with investments in foreign securities, such as changes in political or economic conditions of other countries and changes in the exchange rates of foreign currencies. Depositary Receipts listed on U.S. exchanges are issued by banks or trust companies and entitle the holder to all dividends and capital gains that are paid out on the underlying foreign shares (“Underlying Shares”). When the Fund invests in Depositary Receipts as a substitute for an investment directly in the Underlying Shares, the Fund is exposed to the risk that the Depositary Receipts may not provide a return that corresponds precisely with that of the Underlying Shares.

•   Emerging Markets Risk. The Fund may invest in companies organized in emerging market nations. Investments in securities and instruments traded in developing or emerging markets, or that provide exposure to such securities or markets, can involve additional risks relating to political, economic, or regulatory conditions not associated with investments in U.S. securities and instruments or investments in more developed international markets. Such conditions may impact the ability of the Fund to buy, sell or otherwise transfer securities, adversely affect the trading market and price for Shares and cause the Fund to decline in value.

•   Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. These market conditions may include real or perceived adverse economic conditions, changes in monetary policy, trade regulation or economic sanctions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability and uncertainty, natural or environmental disasters, widespread disease or other public health issues, war, military conflict, acts of terrorism, recessions, economic crisis or adverse investor sentiment generally, among others. Certain changes in the U.S. economy in particular, such as when the U.S. economy weakens or when its financial markets decline, may have a material adverse effect on global financial markets as a whole, and on the securities to which the Fund has exposure. Increasingly strained relations between the U.S. and foreign countries, including as a result of economic sanctions and tariffs, may also adversely affect U.S. issuers, as well as non-U.S. issuers. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers.

•   ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks:

•     Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable or unwilling to

process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

•   Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

•   Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will generally approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant. Because securities held by the Fund may trade on foreign exchanges that are closed when the Fund’s primary listing exchange is open, there are likely to be deviations between the current price of a security and the security’s last quoted price from the closed foreign market. This may result in premiums and discounts that are greater than those experienced by domestic ETFs.

•   Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be listed or traded on U.S. and non-U.S. stock exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares, and this could lead to differences between the market price of the Shares and the underlying value of those Shares.

•   Foreign Securities Risk. Investments in non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, investments in non-U.S. securities may be subject to risk of loss due to foreign currency fluctuations or to political or economic instability. There may be less information publicly available about a non-U.S. issuer than a U.S. issuer. Non-U.S. issuers may be subject to different accounting, auditing, financial reporting and investor protection standards than U.S. issuers. Investments in non-U.S. securities may be subject to withholding or other taxes and may be subject to additional trading, settlement, custodial, and operational risks. With respect to certain countries, there is the possibility of government intervention and expropriation or nationalization of assets. Because legal systems differ, there is also the possibility that it will be difficult to obtain or enforce legal judgments in certain countries. Since foreign exchanges may be open on days when the Fund does not price its Shares, the value of the securities in the Fund’s portfolio may change on days when shareholders will not be able to purchase or sell the Shares. Conversely, Shares may trade on days when foreign exchanges are closed. Each of these factors can make investments in the Fund more volatile and potentially less liquid than other types of investments.

•   Geographic Investment Risk. To the extent that the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region. For example, political and economic conditions and changes in regulatory, tax, or economic policy in a country could significantly affect the market in that country and in surrounding or related countries and have a negative impact on the Fund’s performance. Currency developments or restrictions, political and social instability, and changing economic conditions have resulted in significant market volatility.

•   Index Methodology Risk. The Index may not include all artificial intelligence infrastructure companies around the globe because the Index includes only those companies meeting the Index criteria, including liquidity and market capitalization requirements. In addition, companies that would otherwise be included in the Index might be excluded from the Index if they omit disclosure of, or do not use key terms associated with, their artificial intelligence infrastructure activities in regulatory filings or otherwise keep work related to such activities hidden from public (and the Index Provider’s) view.

•     Index Provider Risk. There is no assurance that the Index Provider, or any agents that act on its behalf, will compile the Index accurately, or that the Index will be determined, maintained, constructed, reconstituted, rebalanced, composed, calculated or disseminated accurately. The Adviser relies upon the Index Provider and its agents to compile, determine, maintain, construct, reconstitute, rebalance, compose, calculate (or arrange for an agent to calculate), and disseminate the Index accurately. Any losses or costs associated with errors made by the Index Provider or its agents generally will be borne by the Fund and its shareholders.

•     Market Capitalization Risk

°     Large-Capitalization Investing. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

°     Mid-Capitalization Investing. The securities of mid-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of large-capitalization companies, but they may also be subject to slower growth than small-capitalization companies during times of economic expansion. The securities of mid-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than large capitalization stocks or the stock market as a whole, but they may also be nimbler and more responsive to new challenges than large-capitalization companies. Some mid-capitalization companies have limited product lines, markets, financial resources, and management personnel and tend to concentrate on fewer geographical markets relative to large-capitalization companies.

°     Small-Capitalization Investing. The securities of small-capitalization companies may be more vulnerable to adverse issuer, market, political, or economic developments than securities of larger-capitalization companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. Some small capitalization companies have limited product lines, markets, and financial and managerial resources and tend to concentrate on fewer geographical markets relative to larger capitalization companies. There is typically less publicly available information concerning smaller-capitalization companies than for larger, more established companies. Small-capitalization companies also may be particularly sensitive to changes in interest rates, government regulation, borrowing costs and earnings.

•   New Fund Risk. The Fund is a recently organized investment company with no operating history. As a result, prospective investors have no track record or history on which to base their investment decision. There can be no assurance that the Fund will grow to or maintain a viable size. Accordingly, investors in the Fund bear the risk that the Fund may not be successful, which could result in the Fund being liquidated at any time without shareholder approval and/or at a time that may not be favorable to shareholders. Such a liquidation could have negative tax consequences for shareholders.

•   Non-Diversification Risk. The Fund is considered to be non-diversified under the 1940 Act, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a smaller number of issuers than a fund that invests more widely. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance. However, the Fund intends to satisfy the diversification requirements for qualifying as a regulated investment company (a “RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”).

•   Passive Investment Risk. The Fund is not actively managed, and its sub-adviser would not sell shares of an equity security due to current or projected underperformance of a security, industry, or sector, unless that security is removed from the Index or the selling of shares of that security is otherwise required upon a reconstitution or rebalancing of the Index in accordance with the Index methodology.

•   Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors.

•     Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.

•     Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund is not able to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Additionally, the Fund will bear any loss on the investment of cash collateral it receives. These events could also trigger adverse tax consequences for the Fund. As securities on loan may not be voted by the Fund, there is a risk that the Fund may not be able to recall the securities in sufficient time to vote on material proxy matters.

•   Tax Risk. To qualify for the favorable tax treatment generally available to a RIC, the Fund must satisfy, among other requirements described in the SAI, certain diversification requirements. Given the concentration of the Index in a relatively small number of securities, it may not always be possible for the Fund to fully implement a replication strategy or a representative sampling strategy while satisfying these diversification requirements. The Fund’s efforts to replicate or represent the Index may cause it inadvertently to fail to satisfy the diversification requirements. If the Fund were to fail to satisfy the diversification requirements, it could be eligible for relief provisions if the failure is due to reasonable cause and not willful neglect and if a penalty tax is paid with respect to each failure to satisfy the applicable requirements. Additionally, relief is provided for certain de minimis failures of the diversification requirements where the Fund corrects the failure within a specified period. If the Fund were to fail to qualify as a RIC for a tax year, and the relief provisions are not available, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. In such case, distributions from earnings and profits its shareholders receive would be taxed as ordinary dividends, although corporate shareholders could be eligible for the dividends received deduction (subject to certain limitations) and individuals may be able to benefit from the lower tax rates available to qualified dividend income. In addition, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest, and make substantial distributions before requalifying as a RIC.

•   Tracking Error Risk. As with all index funds, the performance of the Fund and the Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index.

Performance

As of the date of this Prospectus, the Fund has not commenced operations and therefore does not have a performance history. Once available, the Fund’s performance information will be accessible on the Fund’s website at https://etfs.Grayscale.com/GRAI and will provide some indication of the risks of investing in the Fund.

Portfolio Management

To the extent that a reference in this prospectus refers to the Adviser, such reference should also be read to refer to the Sub-Adviser, where the context requires.

Purchase and Sale of Shares

Shares are listed on the Exchange, and individual Shares may only be bought and sold in the secondary market through brokers at market prices, rather than NAV. Because Shares trade at market prices rather than NAV, Shares may trade at a price greater than NAV (premium) or less than NAV (discount).

The Fund issues and redeems Shares at NAV only in large blocks known as “Creation Units,” which only APs (typically, broker-dealers) may purchase or redeem. The Fund generally issues and redeems Creation Units in exchange for securities, assets or other positions and/or cash (which may include cash in lieu of certain securities, assets or other positions).

Investors may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase Shares (bid) and the lowest price a seller is willing to accept for Shares (ask) when buying or selling Shares in the secondary market (the “bid-ask spread”). Recent information about the Fund, including its NAV, market price, premiums and discounts, and bid-ask spreads is available on the Fund’s website at https://etfs.Grayscale.com/GRAI.

Tax Information

Fund distributions are generally taxable as ordinary income, qualified dividend income, or capital gains (or a combination), unless your investment is in an individual retirement account (“IRA”) or other tax-advantaged account. Distributions on investments made through tax-deferred arrangements may be taxed later upon withdrawal of assets from those accounts.

Financial Intermediary Compensation

If you purchase Shares through a broker-dealer or other financial intermediary (such as a bank) (an “Intermediary”), the Adviser or its affiliates may pay Intermediaries for certain activities related to the Fund, including participation in activities that are designed to make Intermediaries more knowledgeable about exchange traded products, including the Fund, or for other activities, such as marketing, educational training or other initiatives related to the sale or promotion of Shares. These payments may create a conflict of interest by influencing the Intermediary and your salesperson to recommend the Fund over another investment. Any such arrangements do not result in increased Fund expenses. Ask your salesperson or visit the Intermediary’s website for more information.