Filed Pursuant to Rule 424(b)(3) Registration No. 333-291974
PROSPECTUS
G RAYSCALE S UI S TAKING ETF Grayscale Sui Staking ETF (formerly known as Grayscale Sui Trust (SUI)) (the “Trust”) is a Delaware statutory trust that issues common units of fractional undivided beneficial interest (“Shares”), which represent ownership in the Trust. The Trust’s purpose is to hold “SUI”, which are digital assets based on an open source cryptographic protocol existing on the Sui Network, comprising units that constitute the assets underlying the Trust’s Shares. The Trust’s investment objective is for the value of the Shares (based on SUI per Share) to reflect the value of SUI held by the Trust, including SUI earned as Staking Consideration, as determined by reference to the Index Price (as defined herein), less the Trust’s expenses and other liabilities. While an investment in the Shares is not a direct investment in SUI, the Shares are designed to provide investors with a cost- effective and convenient way to gain investment exposure to SUI. Grayscale Investments Sponsors, LLC is the sponsor of the Trust (the “Sponsor”). CSC Delaware Trust Company is the trustee of the Trust (the “Trustee”), The Bank of New York Mellon is the transfer agent of the Trust (in such capacity, the “Transfer Agent”) and the administrator of the Trust (in such capacity, the “Administrator”), Coinbase, Inc. is the prime broker of the Trust (the “Prime Broker”), and Coinbase Custody Trust Company, LLC is the custodian of the Trust (the “Custodian”). The Shares are listed on NYSE Arca, Inc. (“NYSE Arca”) under the symbol “GSUI.” The Trust issues Shares on a continuous basis, but only in Baskets (as described below) and has registered an indeterminate number of Shares. It is expected that the Shares will be sold to the public at varying prices to be determined by reference to, among other considerations, the price of SUI and the trading price of the Shares on the NYSE Arca at the time of each sale. The Shares may be purchased from the Trust only in one or more blocks of 10,000 Shares (a block of 10,000 Shares is called a “Basket”). The Trust issues Baskets of Shares to certain authorized participants (“Authorized Participants”) on an ongoing basis as described in “Plan of Distribution.” In addition, the Trust redeems Shares in Baskets on an ongoing basis from Authorized Participants. The Trust is permitted to conduct creations and redemptions of Shares via in-kind transactions with Authorized Participants or their designees (any such designee, an “AP Designee”) in exchange for SUI and also accept Cash Orders (as defined herein). See “Description of Creation and Redemption of Shares.” Some of the activities of the Authorized Participants may result in their being deemed participants in a distribution in a manner which would render them statutory underwriters and subject them to the prospectus-delivery and liability provisions under the Securities Act of 1933, as amended (the “Securities Act”). See “Plan of Distribution.” Investing in the Shares involves significant risks. You should carefully consider the risk factors described in “Risk Factors” starting on page 18 before you invest in the Shares. The Trust is an “emerging growth company” as defined in the Jumpstart Our Business Startups Act and will therefore be subject to reduced reporting requirements. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense. The Shares are neither interests in nor obligations of the Sponsor or the Trustee. The U.S. dollar value of a Basket of Shares at 4:00 p.m., New York time, on the trade date of a creation or redemption order is equal to the “Basket Amount”, which is the amount of SUI required to create or redeem a Basket of Shares, multiplied by the “Index Price,” which is the U.S. dollar value of a SUI derived from the Digital Asset Trading Platforms (as defined herein) that are reflected in the CoinDesk Sui Benchmark Rate (the “Index”), calculated at 4:00 p.m., New York time, on each business day. The Index Price is calculated using non-GAAP methodology and is not used in the Trust’s financial statements. The Trust is not a registered investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”) and is therefore not subject to regulation under the Investment Company Act. Furthermore, the Sponsor believes that the Trust is not a commodity pool for purposes of the Commodity Exchange Act of 1936, as amended (the “CEA”), as administered by the Commodity Futures Trading Commission (the “CFTC”) and that neither the Sponsor nor the Trustee is subject to regulation by the CFTC as a commodity pool operator or a commodity trading advisor. See “Risk Factors—Risk Factors Related to the Trust and the Shares— Shareholders do not have the protections associated with ownership of shares in an investment company registered under the Investment Company Act or the protections afforded by the CEA.” The date of this prospectus is April 16, 2026.
TABLE OF CONTENTS
Page
Forward-Looking Statements
ii 1 9
Prospectus Summary
The Offering Risk Factors Use of Proceeds
18 61 62 98
Business
Key Personnel of the Sponsor
Certain Relationships and Related Party Transactions
100 102 108 114 120 122 124 125 126 127
Description of the Shares
Description of Creation and Redemption of Shares Material U.S. Federal Income Tax Consequences
ERISA and Related Considerations
Plan of Distribution
Legal Matters
Experts
Where You Can Find More Information; Incorporation by Reference
Glossary of Defined Terms
Neither the Trust nor the Sponsor has authorized anyone to provide you with any information other than that contained in this prospectus or any free writing prospectus prepared by or on behalf of the Trust. Neither the Trust nor the Sponsor takes any responsibility for, and can provide no assurance as to the reliability of, any information that others may give you. Neither the Trust nor the Sponsor is making an offer to sell any security or soliciting any offer to buy any security in any jurisdiction where the offer or sale is not permitted. You should not assume that the information appearing in this prospectus or any free writing prospectus is accurate as of any date other than the respective dates on the front of such documents. The Trust’s business, assets, financial condition, results of operations and prospects may have changed since those dates. This prospectus does not constitute an offer to sell, or an invitation on behalf of the Trust or the Sponsor, to subscribe to or purchase any securities, and may not be used for or in connection with an offer or solicitation by anyone, in any jurisdiction in which such an offer or solicitation is not authorized or to any person to whom it is unlawful to make such an offer or solicitation. Authorized Participants may be required to deliver a prospectus when making transactions in the Shares. The information contained in the section captioned “Business—Overview of the Sui Industry and Market” is based on information obtained from sources that the Sponsor believes are reliable. This prospectus summarizes certain documents and other information in a manner the Sponsor believes to be accurate. In making an investment decision, you must rely on your own examination of the Trust, the Sui industry, the operation of the SUI market and the terms of the offering and the Shares, including the merits and risks involved. Although the Sponsor believes this information to be reliable, the accuracy and completeness of this information is not guaranteed and has not been independently verified. See “Glossary of Defined Terms” for the definition of certain capitalized terms used in this prospectus.
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FORWARD-LOOKING STATEMENTS This prospectus contains “forward-looking statements” with respect to the financial conditions, results of operations, plans, objectives, future performance and business of Grayscale Sui Staking ETF (the “Trust”). Statements preceded by, followed by or that include words such as “may,” “might,” “will,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential” or “continue,” the negative of these terms and other similar expressions are intended to identify some of the forward-looking statements. Investors are therefore cautioned against relying on forward-looking statements. All statements (other than statements of historical fact) included in this prospectus that address activities, events or developments that will or may occur in the future, including such matters as changes in market prices and conditions, the Trust’s operations, the plans of Grayscale Investments Sponsors, LLC (the “Sponsor”) and references to the Trust’s future success and other similar matters are forward-looking statements. These statements are only predictions. Actual events or results may differ materially from such statements. These statements are based upon certain assumptions and analyses the Sponsor made based on its perception of historical trends, current conditions and expected future developments, as well as other factors appropriate in the circumstances. You should specifically consider the numerous risks described in “Risk Factors” in this prospectus. Whether or not actual results and developments will conform to the Sponsor’s expectations and predictions, however, is subject to a number of risks and uncertainties, including: • recent developments in the digital asset economy which have led to extreme volatility and disruption in digital asset markets, a loss of confidence in participants of the digital asset ecosystem, significant negative publicity surrounding digital assets broadly and market-wide declines in liquidity; • the extreme volatility of trading prices that many digital assets, including SUI, have experienced in recent periods and may continue to experience, which could cause the value of the Shares to be volatile and/or have a material adverse effect on the value of the Shares; • the recency of the development of digital assets and the uncertain medium-to-long term value of the Shares due to a number of factors relating to the capabilities and development of blockchain technologies and to the fundamental investment characteristics of digital assets; • the value of the Shares depending on the acceptance of digital assets, such as SUI, which represent a new and rapidly evolving industry; • the value of the Shares relating directly to the value of SUI then held by the Trust, the value of which may be highly volatile and subject to fluctuations due to a number of factors; • a temporary or permanent “fork” or a “clone”, which could adversely affect the value of the Shares; • the largely unregulated nature and lack of transparency surrounding the operations of Digital Asset Trading Platforms, which may adversely affect the value of digital assets and, consequently, the value of the Shares; • the limited history of the Index; • the possibility that illiquid markets may exacerbate losses or increase the variability between the Trust’s NAV and its market price; • the possibility that there may be less liquidity or wider spreads in the market for the Shares as compared to the shares of other spot SUI exchange-traded products, if and when the listing of such products has been approved; • competition from the emergence or growth of other digital assets could have a negative impact on the price of SUI and adversely affect the value of the Shares; • the liquidity of the Shares may be affected if Authorized Participants cease to perform their obligations under the Participant Agreements or the Liquidity Engager is unable to engage Liquidity Providers; • the possibility that the Shares may trade at a price that is at, above or below the Trust’s NAV per Share as a result of the non- concurrent trading hours between NYSE Arca and the Digital Asset Trading Platform Market;
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• regulatory changes or actions by the U.S. Congress or any U.S. federal or state agencies that may affect the value of the Shares or restrict the use of one or more digital assets, validating activity or the operation of their networks or the Digital Asset Trading Platform Market in a manner that adversely affects the value of the Shares; • a determination that SUI or any other digital asset is or involves a transaction in a “security” may adversely affect the value of SUI and the value of the Shares and result in potentially extraordinary, nonrecurring expenses to, or termination of, the Trust; • changes in the policies of the U.S. Securities and Exchange Commission (the “SEC”) that could adversely impact the value of the Shares; • regulatory changes or other events in foreign jurisdictions that may affect the value of the Shares or restrict the use of one or more digital assets, validating activity or the operation of their networks or the Digital Asset Trading Platform Market in a manner that adversely affects the value of the Shares; • the possibility that an Authorized Participant, the Trust or the Sponsor could be subject to regulation as a money service business or money transmitter, which could result in extraordinary expenses to such Authorized Participant, the Trust or the Sponsor and also result in decreased liquidity for the Shares; • regulatory changes or interpretations that could obligate the Trust or the Sponsor to register and comply with new regulations, resulting in potentially extraordinary, nonrecurring expenses to the Trust; • potential conflicts of interest that may arise among the Sponsor or its affiliates and the Trust; • the potential discontinuance of the Sponsor’s continued services, which could be detrimental to the Trust; • the limited ability to facilitate in-kind creations and redemptions of Shares, which could have adverse consequences for the Trust; • the lack of ability to participate in any different form of Staking (as defined herein) to the extent the Staking Condition (as defined herein) is not satisfied, which could have adverse consequences for the Trust; • the risk of loss of SUI from Staking, which could adversely affect the value of the Shares; • the inaccessibility of staked SUI tokens for a variable period of time, which could result in certain liquidity risks to the Trust; • the Trust’s dependence on third parties to effectively execute the Trust’s Staking Arrangements (as defined herein); • the uncertain regulatory landscape surrounding Staking; • potential tax liabilities for beneficial owners of Shares without receiving corresponding distributions from the Trust in connection with Staking; • the Trust’s reliance on third-party service providers to perform certain functions essential to the affairs of the Trust and the challenges replacement of such service providers could pose to the safekeeping of the Trust’s SUI and to the operations of the Trust; and • the Custodian’s possible resignation or removal by the Sponsor or otherwise, without replacement, which could trigger early termination of the Trust. Consequently, all forward-looking statements made in this prospectus are qualified by these cautionary statements, and there can be no assurance that the actual results or developments the Sponsor anticipates will be realized or, even if substantially realized, that they will result in the expected consequences to, or have the expected effects on, the Trust’s operations or the value of the Shares. Should one or more of these risks discussed in “Risk Factors” in this prospectus, or other uncertainties materialize, or should underlying assumptions prove incorrect, actual outcomes may vary materially from those described in forward-looking statements. Forward-looking statements are made based on the Sponsor’s beliefs, estimates and opinions on the date the statements are made and neither the Trust nor the Sponsor is under a duty or undertakes an obligation to update forward-looking statements if these beliefs, estimates and opinions or other circumstances should change, other than as required by applicable laws.
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PROSPECTUS SUMMARY This summary highlights information contained elsewhere in this prospectus. This summary may not contain all of the information that you should consider before deciding to invest in the Shares. You should read this entire prospectus carefully, including the “Risk Factors” section and the consolidated financial statements and the notes to those statements, before making an investment decision about the Shares . Grayscale Sui Staking ETF Trust Overview Grayscale Sui Staking ETF (formerly known as Grayscale Sui Trust (SUI)) (the “Trust”) is a Delaware Statutory Trust that was formed on April 30, 2024, by the filing of the Certificate of Trust with the Delaware Secretary of State in accordance with the provisions of the Delaware Statutory Trust Act (“DSTA”). On February 17, 2026, the Trust changed its name from Grayscale Sui Trust (SUI) to Grayscale Sui Staking ETF by filing a Certificate of Amendment to the Certificate of Trust with the Delaware Secretary of State in accordance with the provisions of the DSTA. The Trust’s purpose is to hold “SUI”, which are digital assets that are created and transmitted through the operations of the peer- to-peer Sui Network, a decentralized network of computers that operates on cryptographic protocols. Out of the 10 billion initially issued SUI, approximately 3,737 million SUI have entered circulation as of December 31, 2025. As of December 31, 2025, the 24- hour trading volume of SUI was approximately $202.6 million. As of December 31, 2025, the aggregate market value of SUI was $5.2 billion. As of December 31, 2025, SUI was the twenty-third largest digital asset by market capitalization, as tracked by CoinMarketCap.com. On September 17, 2025, the Securities and Exchange Commission (the “SEC”) approved a proposed rule change for new Rule 8.201-E (Generic) pursuant to Rule 19b-4 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) to amend NYSE Arca, Inc.’s (“NYSE Arca”) listing rules to permit the listing and trading of shares of certain commodity-based exchange- traded products that satisfy certain generic requirements (the “Generic Listing Standards”). On February 17, 2026, NYSE Arca certified its approval for listing and trading of the Shares of the Trust under the Generic Listing Standards and registration of the Shares under the Exchange Act, which began trading on NYSE Arca on February 18, 2026 (the “Uplisting Date”), following the effectiveness of the Trust’s registration statement on Form S-1, as amended (File No. 333-291974), and since then, the Trust issues shares pursuant to the registration statement on a continuous basis. The Shares are listed on NYSE Arca under the ticker symbol “GSUI.” As a passive investment vehicle, the Trust’s investment objective is for the value of the Shares (based on SUI per Share) to reflect the value of SUI held by the Trust, including SUI earned as Staking Consideration, determined by reference to the Index Price, less the Trust’s expenses and other liabilities. The Trust does not seek to generate returns beyond tracking the price of SUI, except for any SUI earned as Staking Consideration. There can be no assurance that the Trust will be able to achieve its investment objective. The Trust will not utilize leverage, derivatives or any similar arrangements in seeking to meet its investment objective. Until December 31, 2024, Grayscale Investments, LLC was the sponsor of the Trust. As a result of the Reorganization (as defined herein), on January 1, 2025, Grayscale Investments Sponsors, LLC (“GSIS”) and Grayscale Operating, LLC (“GSO”), consolidated subsidiaries of Digital Currency Group, Inc. (“DCG”), became Co-Sponsors of the Trust. On January 3, 2025 GSO voluntarily withdrew as a Sponsor of the Trust, and effective May 3, 2025 GSIS is the sole remaining Sponsor. Prior to May 3, 2025, all references herein to the “Sponsor” shall be deemed to include both GSIS and GSO as Sponsors unless the context otherwise requires, and on or after May 3, 2025, all references herein to the “Sponsor” shall refer only to GSIS. CSC Delaware Trust Company is the trustee (the “Trustee”) of the Trust, The Bank of New York Mellon is the transfer agent (in such capacity, the “Transfer Agent”) and the administrator (in such capacity, the “Administrator”) of the Trust, Continental Stock Transfer & Trust Company is the co-transfer agent of the Trust (the “Co-Transfer Agent”), Coinbase, Inc. is the prime broker (the “Prime Broker”) of the Trust, and Coinbase Custody Trust Company, LLC is the custodian (the “Custodian”) of the Trust. The Trust issues Shares only in one or more blocks of 10,000 Shares (a block of 10,000 Shares is called a “Basket”) to certain authorized participants (“Authorized Participants”) from time to time. The Trust creates Baskets of Shares only upon receipt of SUI and redeems Shares only by distributing SUI or proceeds from the disposition of SUI. Authorized Participants may submit orders to create or redeem Shares under one of two procedures, which are referred to as “In-Kind Orders” and “Cash Orders” in this prospectus. In connection with In-Kind Orders, Authorized Participants, or their AP Designees, deposit SUI directly with the Trust or receive SUI directly from the Trust. Cash Orders are made through the participation of a Liquidity Provider (as defined herein) and facilitated by the Transfer Agent, as described in “Description of Creation and Redemption of Shares.” Authorized Participants must pay a Variable Fee (as defined herein) in connection with certain Cash Orders, which is not applicable to In-Kind Orders, and thus will result in different execution prices for Cash Orders versus In-Kind Orders.
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The Shares are neither interests in nor obligations of the Sponsor or the Trustee. As provided under the Trust Agreement, the Trust’s assets will not be loaned or pledged, or serve as collateral for any loan, margin, rehypothecation, or other similar activity to which the Sponsor, the Trust or any of their respective affiliates are a party. Some of the notable features of the Trust and its Shares include the holding of SUI in the Trust’s own accounts, the experience of the Sponsor’s management team in the Sui Industry and the use of the Custodian to protect the Trust’s private keys. See “Business—Activities of the Trust.” The Sponsor maintains an internet website at etfs.grayscale.com/gsui, through which the Trust’s annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, are made available free of charge after they have been filed with or furnished to the SEC. Additional information regarding the Trust may also be found on the SEC’s EDGAR database at www.sec.gov. The contents of the websites referred to above and any websites referred to herein are not incorporated into this filing or any other reports or documents we file with or furnish to the SEC. Further, our references to the URLs for these websites are intended to be inactive textual references only. Trust Objective and Determination of Principal Market NAV and NAV The Trust’s investment objective is for the value of the Shares (based on SUI per Share) to reflect the value of SUI held by the Trust, including SUI earned as Staking Consideration, determined by reference to the Index Price, less the Trust’s expenses and other liabilities. There can be no assurance that the Trust will be able to achieve its investment objective. While an investment in the Shares is not a direct investment in SUI, the Shares are designed to provide investors with a cost- effective and convenient way to gain investment exposure to SUI. A substantial direct investment in SUI may require expensive and sometimes complicated arrangements in connection with the acquisition, security and safekeeping of the SUI and may involve the payment of substantial fees to acquire such SUI from third-party facilitators through cash payments of U.S. dollars. Because the value of the Shares is designed to be correlated with the value of SUI held by the Trust, it is important to understand the investment attributes of, and the market for, SUI. The Trust’s SUI are carried, for financial statement purposes, at fair value, as required by U.S. generally accepted accounting principles (“GAAP”). The Trust determines the fair value of SUI based on the price provided by the Digital Asset Market (defined below) that the Trust considers its principal market as of 4:00 p.m., New York time, on the valuation date. The net asset value of the Trust determined on a GAAP basis is referred to in this prospectus as “Principal Market NAV.” “Digital Asset Market” means a “Brokered Market,” “Dealer Market,” “Principal-to-Principal Market” or “Exchange Market,” as each such term is defined in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Master Glossary. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Principal Market and Fair Value Determination” in the Trust's Annual Report on Form 10-K for more information on the Trust’s principal market selection. The Trust uses the Index Price to calculate its “NAV,” a non-GAAP metric, which is the aggregate value, expressed in U.S. dollars, of the Trust’s assets (other than U.S. dollars or other fiat currency), less the U.S. dollar value of the Trust’s expenses and other liabilities calculated in the manner set forth under “Business —Valuation of SUI and Determination of NAV.” “NAV per Share” is calculated by dividing NAV by the number of Shares then outstanding. NAV and NAV per Share are not measures calculated in accordance with U.S. GAAP. NAV is not intended to be a substitute for the Trust’s Principal Market NAV calculated in accordance with U.S. GAAP, and NAV per Share is not intended to be a substitute for the Trust’s Principal Market NAV per Share calculated in accordance with U.S. GAAP. Staking The Trust Agreement provides that the Trust may engage in Staking, but only if (and, then, only to the extent that) the Staking Condition has been satisfied. On February 17, 2026, the Staking Condition was satisfied with respect to the form of Staking described in this prospectus, and on February 18, 2026, the Trust commenced Staking pursuant to the Staking Arrangements described below. The Sponsor may in the future modify the form of Staking in which the Trust engages, but only if (and, then, only to the extent that) the Staking Condition has been satisfied with respect to any such modified form of Staking, and subject to compliance with any additional requirements that may arise in connection with satisfaction of the Staking Condition with respect thereto.
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Staking Arrangements and Provider-Facilitated Staking Model The Sponsor has caused, and from time to time may cause, the Trust to enter into written arrangements (the “Staking Arrangements”) with the Custodian and one or more third party staking providers (each, a “Staking Provider”), which may be affiliates of the Custodian or other trusted institutional validators, to stake the Trust’s SUI to a Staking Provider operating validator software and associated hardware (“Provider-Facilitated Staking”). The Sponsor anticipates that the Trust’s SUI is and will be staked exclusively by means of Provider-Facilitated Staking. The Staking Arrangements are set forth in the Staking Addendum to the Custodial Services Agreement between the Trust and the Custodian, a copy of which is attached as an exhibit to the registration statement of which this prospectus forms a part. Under the Staking Arrangements, the Trust is permitted to accept only Staking Consideration received in the form of SUI, and is not permitted to accept any Other Staking Consideration in the form of other digital assets. Neither the Trust, nor the Sponsor on behalf of the Trust, has the ability under the Staking Arrangements to take advantage of any variations in the market to improve the investments of shareholders, including with respect to variations based on the value of SUI or the amount of Staking Consideration received as staking rewards. As a whole, the Staking Arrangements permit the Trust to retain ownership of its SUI at all times for U.S. federal income tax purposes while simultaneously protecting and conserving the Trust Estate by mitigating the risk that another party or group could control a majority of the Sui Network and engage in transactions that could reduce the Trust Estate’s value. A Staking Provider must meet certain requirements in order to be selected to participate in the Provider-Facilitated Staking model contemplated by the Staking Arrangements. For example, each Staking Provider is required to be unrelated to both the Trust and the Sponsor. Moreover, a Staking Provider is also required to regularly enter into staking arrangements with unrelated persons involving activities similar to the Staking Arrangements. Under the Staking Arrangements, the Staking Provider bears all of its own expenses (including those on account of its validation activities). The Staking Provider is the node operator and is obligated to operate the validator through which the Trust’s SUI is staked to ensure that validation occurs. The Trust’s SUI is currently staked from the Trust’s wallets administered by the Custodian, and the Staking Provider performs any related validation activities. The Trust retains control of its staked SUI because the Sui Network does not permit the Staking Provider to transfer staked SUI to any wallet other than as designated by the Sponsor. Because the Trust's staked SUI cannot, pursuant to the Sui Network protocol, be transferred other than as directed by the Sponsor, the Trust's SUI is not deemed commingled with the SUI of any other SUI holder in connection with Staking, such as the Staking Provider or others who stake to the Staking Provider, even if the Staking Provider is in receipt of other SUI holders' validation rights. In particular, the Staking Provider is not able to transfer unstaked SUI or Staking Consideration to another address on the Sui Network. The Trust does not itself undertake any validation activities, and the Sponsor is not required to perform any services. Moreover, the Sponsor is not required to make any decisions or take any actions, other than (i) selecting the Staking Provider(s) and entering into the corresponding Staking Arrangement(s), and (ii) determining, from time to time, what portion of the Trust’s SUI to stake and un-stake, and informing the Staking Provider(s) of those determinations. As of the date of this filing, the Sponsor generally seeks to stake as much of the Trust's SUI as is practicable (i.e., up to 100%) at all times, except (i) as necessary to pay the Sponsor’s Fee and the Sponsor’s Staking Fee, (ii) as necessary to pay any additional Trust expenses, (iii) as necessary to satisfy existing and reasonably foreseen potential redemption requests as determined by the Sponsor, (iv) as necessary to reduce the SUI obtained by the Trust as Staking Consideration to cash for distribution at regular intervals, (v) as necessary to reduce the SUI obtained by the Trust as Staking Consideration to cash in connection with the Trust's liquidation, (vi) as necessary to take protective actions in respect of vulnerabilities in the source code or cryptography underlying the Sui Network and/or its proof-of-stake protocol, its staking smart contracts or its validator client software, (vii) if the Custodian discontinues its arrangements with the Trust and such discontinuance affects the Trust's SUI, for so long as is reasonably necessary to re-establish those arrangements or to establish similar arrangements with other parties, (viii) if the Custodian discontinues its arrangements with the Staking Provider and such discontinuance affects the Trust's SUI, for so long as is reasonably necessary to re-establish those arrangements or to establish similar arrangements with other parties, (ix) in the event of a change in applicable law or regulation, (x) as necessary to maintain a Liquidity Sleeve (as defined herein), (xi) as necessary pursuant to a “contingent liquidity arrangement” within the meaning of Section 6.02(12) of IRS Revenue Procedure 2025-31 or (xii) in accordance with any other exception that is expressly contemplated by an opinion, ruling or tax guidance that satisfies the Staking Condition. All SUI received by the Trust in connection with the creation of new Shares, or as Staking Consideration, would also be staked upon receipt by the Trust, unless one or more of the exceptions described in clauses (i)-(xii) above applies. Under the Trust Agreement, the Trust's Staking Arrangements also must satisfy certain other requirements derived from IRS Revenue Procedure 2025-31. Moreover, any staked SUI which must be un- staked in order to fulfill a distribution in connection with a redemption (to the extent such distribution cannot be fulfilled utilizing the portion of the Trust’s SUI that has not been staked, or through another mechanism to manage liquidity in connection with Redemption Orders contemplated by an opinion of a Tax Advisor, a Tax Ruling or Tax Guidance that satisfies the Staking Condition) will be un- staked only after the redemption request is approved by the Trust, the Sponsor executes an un-stake or withdrawal transaction through
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the Custodian, and such transaction is processed by the Sui Network. The Staking Provider is not able to transfer unstaked SUI or Staking Consideration to another address on the Sui Network. The Sponsor has satisfied the Staking Condition with respect to certain liquidity procedures, which it believes will ensure that it will satisfy existing and reasonably foreseen redemption requests. Specifically, the Sponsor intends to maintain a portion of unstaked SUI in the Trust (the “Liquidity Sleeve”). Because the SUI in the Liquidity Sleeve is freely transferable, there is no timing mismatch between settlement of Shares in primary market redemptions and the SUI transfer time. The percentage of the Trust’s SUI comprising the Liquidity Sleeve will be dynamic and subject to adjustment based on anticipated primary and secondary market activity of the Shares and the SUI unstaking process. The Sponsor generally seeks to stake as much of the Trust’s SUI as is practicable (i.e., up to 100%) at all times, with the remainder of the Trust’s SUI remaining unstaked in order to address the various exceptions and other considerations described herein. The percentage of the Trust’s SUI that is staked each day is reported the following day at 4:00 p.m., New York time, on etfs.grayscale.com/gsui. In the future and subject to the satisfaction of the Staking Condition thereto, the Sponsor, on behalf of the Trust, may be able to enter into other financing arrangements or implement other mechanisms to manage SUI liquidity constraints. For example, in the future, the Sponsor may arrange for the Trust to enter into redemption orders involving the delivery of SUI to a Liquidity Provider on a delayed basis (i.e., when the appropriate number of the Trust’s SUI are or become freely transferable), after the Liquidity Provider has delivered cash to the Trust to settle the redemption order. Under a delayed delivery order, the Variable Fee payable by an Authorized Participant would be adjusted, based on the estimated length of time to SUI delivery, to compensate the Liquidity Provider for agreeing to accept settlement on a delayed basis. No further adjustment to the Variable Fee would be made, and the Trust would not be required to further compensate the Liquidity Provider (or be entitled to compensation from the Liquidity Provider) if the actual date of SUI delivery differed from the estimated delivery date. It is also possible that, in connection with future redemption orders, the Sponsor may make arrangements for the Trust to obtain liquid SUI from the Custodian or another institutional liquidity provider in exchange for the Trust’s present or future delivery of a similar number of SUI tokens, although the details of any such future arrangement are not presently known. These and other liquidity risk policies and procedures are intended to be consistent with NYSE Arca’s generic listing standards. However, there can be no assurance that such arrangements would be available as intended or provide sufficient liquidity to satisfy redemption requests. Under the Staking Arrangements, any Staking Consideration earned accrues in accordance with the Sui Network’s rewards distribution mechanism to the Trust’s wallets administered by the Custodian. Periodically, the Trust may either (i) distribute SUI received as Staking Consideration to the Trust’s beneficiaries (likely using a liquidating agent), (ii) sell that SUI for cash and distribute the proceeds to the Trust’s beneficiaries, (iii) retain the SUI in the Trust, (iv) pay a portion of the Staking Consideration to the Sponsor (the “Sponsor's Staking Fee”) as consideration for its facilitation of the Staking Arrangements or (v) a combination of the foregoing, in the Sponsor’s sole discretion. The Sponsor has implemented a staking policy with respect to the Trust, which describes the frequency of, and conditions under which the Trust will make such distributions, if any, to the Trust’s beneficiaries. The Sponsor has made such staking policy available to shareholders on the Sponsor’s website. Subject to any slashing risk, the Trust (through the Custodian) will maintain control and remain the record and beneficial owner of the staked tokens at all times, and the tokens will remain associated with the Trust’s wallet. As of February 18, 2026, and pursuant to the Staking Arrangements, the Custodian and the Staking Provider became entitled to receive a portion of the gross Staking Consideration generated under the Staking Arrangements, reflecting the Custodian’s fee and the Staking Provider’s share of such Staking Consideration, with the remainder received by the Trust. The allocation of gross Staking Consideration between the Custodian and the Staking Provider reflects an arm’s length allocation that is independent of the expenses of both the Staking Provider and Custodian, and may be stated as a percentage of the gross Staking Consideration. In addition, pursuant to the Trust Agreement and as consideration for the Sponsor’s facilitation of Staking, the Sponsor is permitted to receive a fee equal to a portion of the Staking Consideration, payable in SUI, which accrues daily in U.S. dollars in an amount calculated as a per annum percentage of any Staking Consideration received by the Trust, as may be directed by the Sponsor in its sole discretion. The Sponsor’s Staking Fee is payable to the Sponsor daily in arrears. Effective February 18, 2026, the Sponsor’s Staking Fee, the Custodian’s fee and the Staking Provider’s share of the Staking Consideration comprise an aggregate of 23% of the gross Staking Consideration generated under the Staking Arrangements. The Trust receives and retains the remainder of such gross Staking Consideration. Security and Controls The Trust’s Custodian has multiple layers of security protocols intended to protect the Trust’s assets from unauthorized access or transfer, which remain in place when the Trust’s SUI is staked. The Trust’s SUI is staked from the Trust’s wallets and is not transferred to any other wallet to be staked. The Sui protocol limits the activities of the Staking Provider to executing only those activities specified by the protocol, such as staking, un-staking and performing validation activities and does not enable the Staking Provider to unilaterally transfer staked assets to any wallet not specified by the Sponsor. Accordingly, the Staking Provider does not have any powers to move the Trust’s staked SUI other than at the direction of the Sponsor. In particular, the Staking Provider is not authorized to leverage or rehypothecate the Trust’s SUI tokens.
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The Staking Provider is also not able to change the designated wallet addresses on the Sui Network to which staked SUI is to be withdrawn or to which Staking Consideration shall be sent. In addition, the Staking Arrangements do not alter the Trust’s custody environment or security procedures. The controls currently in place between the Sponsor and the Custodian also govern the activities related to staking and un-staking SUI, which are outlined in the Staking Arrangements. See “Description of the Shares—Staking—Security and Controls” and “Risk Factors—Risk Factors Related to Staking” for more SUI is a digital asset that is created and transmitted through the operations of the peer-to-peer Sui Network, a decentralized network of computers that operates on cryptographic protocols. No single entity owns or operates the Sui Network, the infrastructure of which is collectively maintained by a decentralized user base. The Sui Network allows people to exchange tokens of value, called SUI, which are recorded on a public transaction ledger known as a blockchain. SUI can be used to pay for goods and services, including computational power on the Sui Network, or it can be converted to fiat currencies, such as the U.S. dollar, at rates determined on Digital Asset Trading Platforms (as defined herein) or in individual end-user-to-end-user transactions under a barter system. Furthermore, the Sui Network was designed to allow users to write and implement smart contracts—that is, general-purpose code that executes redundantly across the network and can instruct the transmission of information and value based on a sophisticated set of logical conditions. Using smart contracts, users can create markets, store registries of debts or promises, represent the ownership of property, move funds in accordance with conditional instructions and create digital assets other than SUI on the Sui Network. Smart contract operations are executed on the Sui Network in exchange for payment of SUI. Like the Ethereum Network, the Sui Network is one of a number of projects intended to expand blockchain use beyond just a peer-to-peer money system. The price of SUI on public Digital Asset Trading Platforms has a limited history, and during this history, SUI prices on the Digital Asset Markets more generally, and on Digital Asset Trading Platforms individually, have been volatile and subject to influence by many factors, including operational interruptions. While the Index is designed to limit exposure to the interruption of individual Digital Asset Trading Platforms, the Index Price, and the price of SUI generally, remains subject to volatility experienced by Digital Asset Trading Platforms, and such volatility could adversely affect the value of the Shares. For example, from January 1, 2025 through December 31, 2025, the Index Price ranged from $1.33 to $5.23, with the straight average being $3.02. See “Business—Overview of the Sui Industry and Market—Historical NAV and SUI Prices.” Several U.S. regulators, including the Financial Crimes Enforcement Network of the U.S. Department of the Treasury (“FinCEN”), the SEC, the Commodity Futures Trading Commission (“CFTC”), the U.S. Internal Revenue Service (“IRS”), and state regulators, including the New York Department of Financial Services (“NYDFS”), have made official pronouncements or issued guidance or rules regarding the treatment of digital assets. Similarly, the treatment of SUI and other digital assets is often uncertain or contradictory in other countries. The regulatory uncertainty surrounding the treatment of SUI creates risks for the Trust and its Shares. See “Risk Factors—Risk Factors Related to the Regulation of Digital Assets, the Trust and the Shares.” information. Sui History
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Summary Risk Factors Before you invest in the Shares, you should carefully consider all the information in this prospectus, including matters set forth under the heading “Risk Factors.” Some of the more significant challenges and risks relating to an investment in the Shares include those associated with the following: • Extreme volatility of trading prices that many digital assets, including SUI, have experienced in recent periods and may continue to experience, could have a material adverse effect on the value of the Shares and the Shares could lose all or substantially all of their value; • The medium-to-long term value of the Shares is subject to a number of factors relating to the capabilities and development of blockchain technologies and to the fundamental investment characteristics of digital assets; • The value of the Shares is dependent on the acceptance of digital assets, such as SUI, which represent a new and rapidly evolving industry; • Digital assets may have concentrated ownership and large sales or distributions by holders of such digital assets could have an adverse effect on the market price of such digital assets; • Recent developments in the digital asset economy have led to extreme volatility and disruption in digital asset markets, a loss of confidence in participants of the digital asset ecosystem, significant negative publicity surrounding digital assets broadly and market-wide declines in liquidity; • The largely unregulated nature and lack of transparency surrounding the operations of Digital Asset Trading Platforms may adversely affect the value of digital assets and, consequently, the value of the Shares; • The value of the Shares relates directly to the value of SUI held by the Trust, the value of which may be highly volatile and subject to fluctuations; • The Shares may trade at a price that is at, above or below the Trust’s NAV per Share as a result of the non-concurrent trading hours between NYSE Arca and the Digital Asset Trading Platform Market; • Shareholders may suffer a loss on their investment if the Shares trade above or below the Trust’s NAV per Share; • Validators may suffer losses due to Staking, or Staking may prove unattractive to validators, which could adversely affect the Sui Network; • A temporary or permanent “fork” or a “clone” could adversely affect the value of the Shares; • Possible illiquid markets may exacerbate losses or increase the variability between the Trust’s NAV and its market price; • The possibility that there may be less liquidity or wider spreads in the market for the Shares as compared to the shares of other spot SUI exchange-traded products, if and when the listing of such products has been approved; • The limited history of the Index; • Competition from the emergence or growth of other digital assets could have a negative impact on the price of SUI and adversely affect the value of the Shares; • The liquidity of the Shares may be affected if Authorized Participants cease to perform their obligations under the Participant Agreements or the Liquidity Engager is unable to engage Liquidity Providers; • Any suspension or other unavailability of the Trust’s redemption program may cause the Shares to trade at a discount to the NAV per Share; • A determination that SUI or any other digital asset is or involves a transaction in a “security” may adversely affect the value of SUI and the value of the Shares, and result in potentially extraordinary, nonrecurring expenses to, or termination of, the Trust;
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• Regulatory changes or actions by the U.S. Congress or any U.S. federal or state agencies may affect the value of the Shares or restrict the use of SUI, validating activity or the operation of the Sui Network or the Digital Asset Markets in a manner that adversely affects the value of the Shares; • Changes in the policies of the U.S. Securities and Exchange Commission (the “SEC”) could adversely impact the value of the Shares; • Regulatory changes or other events in foreign jurisdictions may affect the value of the Shares or restrict the use of one or more digital assets, validating activity or the operation of their networks or the Digital Asset Trading Platform Market in a manner that adversely affects the value of the Shares; • An Authorized Participant, the Trust or the Sponsor could be subject to regulation as a money service business or money transmitter, which could result in extraordinary expenses to the Authorized Participant, the Trust or the Sponsor and also result in decreased liquidity for the Shares; • Regulatory changes or interpretations could obligate the Trust or the Sponsor to register and comply with new regulations, resulting in potentially extraordinary, nonrecurring expenses to the Trust; • Conflicts of interest may arise among the Sponsor or its affiliates and the Trust; • The Sponsor’s services may be discontinued, which could be detrimental to the Trust; • The limited ability to facilitate in-kind creations and redemptions of Shares could have adverse consequences for the Trust; • If the Custodian resigns or is removed by the Sponsor, or otherwise, without replacement, it could trigger early termination of the Trust; • The lack of ability to participate in any different form of Staking to the extent the Staking Condition is not satisfied could have adverse consequences for the Trust; • Staking introduces a risk of loss of SUI, which could adversely affect the value of the Shares; • Staked SUI tokens will be inaccessible for a variable period of time, determined by a range of factors, which could result in certain liquidity risk to the Trust; • The Trust will be dependent on third parties to effectively execute the Trust’s Staking Arrangements; • The regulatory landscape surrounding Staking is uncertain; • Beneficial owners of Shares could incur tax liabilities without receiving corresponding distributions from the Trust; • The Trust relies on third-party service providers to perform certain functions essential to the affairs of the Trust and the replacement of such service providers could pose a challenge to the safekeeping of the Trust’s SUI and to the operations of the Trust; and • There is no guarantee that an active trading market for the Shares will continue to develop. Emerging Growth Company Status The Trust is an “emerging growth company” as defined in the Jumpstart Our Business Startups Act (the “JOBS Act”). For as long as the Trust is an emerging growth company, unlike other public companies that are not emerging growth companies under the JOBS Act, it will not be required to: • provide an auditor’s attestation report on management’s assessment of the effectiveness of our system of internal control over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act;
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