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 that are reflected in, from the commencement of the Trust’s operations until December 18, 2025, the CoinDesk SUI Reference Rate Price (the “Index”) 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. As of December 19, 2025 the Index is the CoinDesk Sui Benchmark Rate (formerly known as the CoinDesk SUI CCIXber Reference Rate). See “Business — Overview of the Sui Industry and Market—The Index and the Index Price.” The Basket Amount on any trade date is determined by dividing (x) the amount of SUI owned by the Trust at 4:00 p.m., New York time, on such trade date, after deducting the amount of SUI representing the U.S. dollar value of accrued but unpaid fees and expenses of the Trust (converted using the Index Price at such time, and carried to the eighth decimal place), by (y) the number of Shares outstanding at such time (with the quotient so obtained calculated to one one-hundred-millionth of one SUI (i.e., carried to the eighth decimal place)), and multiplying such quotient by 10,000. The Trust creates Baskets of Shares only upon receipt of SUI and will redeem 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. 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) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), will be made available free of charge after they have been filed with or furnished to the Securities and Exchange Commission (the “SEC”) in each case following the effective date of the registration statement of which this prospectus forms a part. 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 (to the extent that the Staking Condition is satisfied and Staking is implemented), 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. To date, the Trust has not met its investment objective and the Shares quoted on OTCQB have not reflected the value of the SUI held by the Trust, less the Trust’s expenses and other liabilities, but instead have traded at both premiums and discounts to such value, which at times has been substantial. 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
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