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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