S-1/A: Grayscale Sui Trust Amends S-1/A for Staking ETF Conversion

Grayscale Sui Trust files Amendment No. 3 to its S-1 registration statement, signaling its intent to rename as Grayscale Sui Staking ETF and list on NYSE Arca, with a focus on SUI holdings and potential staking activities.

Summary

• Grayscale Sui Trust (SUI) is filing Amendment No. 3 to its S-1 registration statement to become Grayscale Sui Staking ETF and list its shares on NYSE Arca under the symbol GSUI.
• The Trust's investment objective is to reflect the value of SUI held, including SUI earned from staking, less expenses and liabilities, aiming to provide cost-effective exposure to SUI.
• As of December 31, 2025, approximately 3,737 million SUI out of 10 billion initially issued SUI have entered circulation, with an aggregate market value of $5.2 billion, making SUI the twenty-third largest digital asset by market capitalization.
• The Trust will issue and redeem Shares in Baskets of 10,000 Shares, allowing for both in-kind and cash creation/redemption orders.
• The Sponsor's fee is an annual rate of 0.35% of the Trust's NAV Fee Basis Amount, payable in SUI, with a temporary waiver until the earlier of a 3-month period post-NYSE Arca listing or the Trust reaching $1 billion in assets under management.
• The Trust is currently prohibited from engaging in staking activities until the 'Staking Condition' is satisfied, which involves regulatory and tax guidance.
• A potential investment from the Sui Foundation is under discussion, involving the acquisition of 20,000,000 SUI tokens in a private offering, which would constitute a majority of the Trust's shares and be subject to a one-year lock-up period.
• The Trust's net assets were $10,103 thousand as of September 30, 2025, a 20% decrease from $12,635 thousand as of December 31, 2024, primarily due to SUI price depreciation.
• The SUI price (Index Price) ranged from $0.53 to $5.23 between August 1, 2024, and December 31, 2025, with a straight average of $2.79.

Sentiment

Score: 6

Explanation: StockSavvy.ai views this filing as moderately positive, driven by the strategic move to convert to an ETF and the potential for staking, which could attract more investors. However, significant market volatility, regulatory uncertainties, and the conditional nature of staking temper the overall sentiment.

Positives

• The Trust intends to list its Shares on NYSE Arca under the symbol GSUI, which is expected to provide investors with an efficient means to implement investment strategies and enhance liquidity.
• The Sponsor has committed to a competitive annual fee of 0.35% of the NAV Fee Basis Amount, which is temporarily waived until the earlier of a 3-month period post-NYSE Arca listing or the Trust reaching $1 billion in AUM.
• The Trust's structure allows for both in-kind and cash creation/redemption mechanisms, which are designed to facilitate arbitrage opportunities and keep the Share value closely linked to the SUI Index Price.
• The potential for the Trust to engage in staking activities, once the 'Staking Condition' is met, could generate additional SUI for the Trust, enhancing its investment objective.
• The Custodian, Coinbase Custody Trust Company, LLC, employs multiple layers of security protocols, including cold storage and geographical distribution of private key shards, to protect the Trust's SUI assets.

Negatives

• The Trust's net assets decreased by 20% from $12,635 thousand on December 31, 2024, to $10,103 thousand on September 30, 2025, primarily due to SUI price depreciation.
• The Trust has not yet met its investment objective, and Shares quoted on OTCQB have traded at both substantial premiums and discounts to the NAV per Share.
• The Trust is currently prohibited from engaging in staking activities, which could place the Shares at a comparative disadvantage relative to direct SUI investments or other vehicles that can stake.
• The value of SUI has experienced extreme volatility, with the Index Price ranging from $0.53 to $5.23 between August 1, 2024, and December 31, 2025.
• The digital asset market, including SUI, is largely unregulated and lacks transparency, making it susceptible to fraud, market manipulation, business failures, and security breaches.
• The limited ability to facilitate in-kind creations and redemptions of Shares could impair liquidity and cause Shares to trade at significant premiums or discounts.
• The potential investment by the Sui Foundation could result in a single shareholder controlling a majority of the Trust's shares, limiting the voting influence of other shareholders and potentially impacting market dynamics.

Risks

• Extreme volatility of SUI trading prices could materially adversely affect the value of the Shares, potentially leading to a loss of all or substantially all of their value.
• The medium-to-long term value of Shares is uncertain due to the recency of digital asset development, dependence on the internet, and potential for malicious activity or flaws in cryptographic protocols.
• Digital assets, including SUI, represent a new and rapidly evolving industry, and their value depends on continued acceptance, which is not guaranteed.
• Concentrated ownership of SUI, with the largest 100 wallets holding approximately 16% of SUI in circulation, could lead to adverse effects on market price from large sales or distributions.
• Recent disruptions and instability in the digital asset markets, including failures of prominent participants like FTX, Celsius Network, and Voyager Digital, could have a material adverse effect on SUI value and liquidity.
• The largely unregulated nature and lack of transparency of Digital Asset Trading Platforms may lead to fraud, market manipulation, business failures, or security issues, adversely affecting SUI value.
• Validators on the Sui Network may suffer losses due to staking penalties (slashing) or find staking unattractive, which could adversely affect the network and SUI value.
• A temporary or permanent fork or clone of the Sui Network could adversely affect the value of the Shares, especially if the Sponsor's chosen network is not the most valuable fork.
• The lack of active trading markets for the Shares may result in losses for investors at the time of disposition.
• Illiquid markets for SUI may exacerbate losses or increase the variability between the Trust's NAV and its market price.
• Regulatory changes or actions by U.S. Congress or federal/state agencies, including a determination that SUI is a security, could adversely affect SUI value and potentially lead to the Trust's termination.
• The Trust's reliance on third-party service providers (Custodian, Prime Broker, Authorized Participants, Liquidity Providers) introduces risks of business disruptions, financial instability, or security failures.
• Security threats to the Trust's SUI holdings (Vault Balance or Settlement Balance) could result in halting operations, loss of assets, or damage to reputation.
• SUI transactions are irrevocable, and stolen or incorrectly transferred SUI may be irretrievable, leading to potential losses.
• The lack of full insurance and limited legal recourse against service providers expose the Trust and shareholders to the risk of SUI loss.
• The Trust may be required to terminate and liquidate at a disadvantageous time for shareholders.
• Shareholders have limited voting rights and restricted ability to bring derivative actions, with a 10% ownership threshold required for such actions.
• The Sponsor's determination of NAV and NAV per Share, and any errors or changes in calculation, could adversely affect Share value.
• Extraordinary, non-recurring expenses not covered by the Sponsor's fee could be borne by the Trust, requiring SUI sales and reducing Share value.
• Shareholders may incur tax liabilities from SUI transfers or sales without corresponding distributions from the Trust.
• Intellectual property rights claims related to SUI or Trust operations could lead to extraordinary expenses or Trust termination.
• Pandemics, epidemics, and other disasters could negatively impact demand for digital assets and disrupt Trust operations.
• Competition from other digital assets, central bank digital currencies (CBDCs), and competing exchange-traded SUI products could negatively impact SUI price and Share value.
• Congestion or delays on the Sui Network may delay SUI purchases or sales by the Trust, affecting liquidity and confidence.
• Prices of SUI may be affected by stablecoins, their issuers' activities, and regulatory treatment, potentially leading to market volatility.
• The regulatory landscape surrounding staking is uncertain, potentially exposing the Trust to unforeseen regulatory risks or enforcement actions.
• If the Staking Condition is satisfied, beneficial owners of Shares could incur tax liabilities from staking rewards without receiving corresponding distributions from the Trust.

Future Outlook

The Trust intends to rename as Grayscale Sui Staking ETF and list its Shares on NYSE Arca, aiming to provide investors with exposure to SUI, including potential staking rewards. The Sponsor expects the arbitrage mechanism to keep the Share value closely linked to the Index Price upon NYSE Arca listing. The ability to engage in staking is contingent on satisfying the 'Staking Condition,' which involves obtaining favorable tax and regulatory guidance. If staking is implemented, the Sponsor anticipates staking up to 100% of the Trust's SUI, with provisions for liquidity management during redemption periods.

Management Comments

• The Sponsor believes that the security procedures in place for the Trust, including offline storage for a substantial portion of SUI, are reasonably designed to safeguard the Trust's SUI.
• The Sponsor expects that it may be advisable to discontinue the affairs of the Trust if a federal court upholds an allegation that SUI is a security under federal securities laws, among other reasons.
• The Sponsor has not observed a material difference between the Index Price and average prices from the constituent Digital Asset Trading Platforms individually or as a group.
• The Sponsor does not expect the Management Reorganization to have any material impact on the operations of the Trust.

Industry Context

StockSavvy.ai notes that this S-1/A filing reflects the ongoing trend of digital asset trusts seeking conversion to spot ETFs, particularly for altcoins beyond Bitcoin and Ethereum. The emphasis on staking functionality positions Grayscale Sui Staking ETF to compete in a rapidly evolving market where yield generation is a key differentiator. The filing also highlights the continued regulatory scrutiny in the digital asset space, with explicit mentions of SEC and CFTC actions, and the impact of stablecoin volatility on broader digital asset markets. The competitive landscape includes numerous other digital assets and financial vehicles, underscoring the need for clear regulatory frameworks and robust market infrastructure.

Comparison to Industry Standards

• SUI, as the twenty-third largest digital asset by market capitalization ($5.2 billion as of December 31, 2025), faces significant competition from more established digital assets like Bitcoin and Ether, which have substantially larger market caps and broader trading platform support.
• The Sui Network directly competes with other smart contract platforms such as Ethereum, Polkadot, Avalanche, and Cardano, which have varying levels of adoption and development.
• The proposed 0.35% sponsor fee is competitive within the digital asset ETF space, particularly when compared to some existing Bitcoin and Ethereum ETFs.
• The Trust's reliance on Coinbase Custody Trust Company, LLC for cold storage and security aligns with industry best practices for institutional digital asset custody, similar to other major digital asset funds.
• The explicit mention of in-kind and cash creation/redemption mechanisms is consistent with the structure of recently approved spot Bitcoin and Ethereum ETFs, aiming to maintain price correlation through arbitrage.

Management Changes

Corporate Governance

Legal Proceedings

• Osprey Funds, LLC filed a lawsuit against the Sponsor in Connecticut Superior Court alleging violations of the Connecticut Unfair Trade Practices Act (CUTPA), which was dismissed on February 7, 2025, and the appeal was withdrawn on May 12, 2025.
• Genesis Global Capital, LLC (an affiliate of the Sponsor's parent company, DCG) filed a complaint in U.S. Bankruptcy Court against DCG and certain affiliates, including GSO (a former co-sponsor), alleging preferential transfers of BTC and ETC valued at approximately $12.6 million as of September 30, 2025. GSO intends to vigorously defend against this lawsuit.

Related Party Transactions

• Digital Currency Group, Inc. (DCG), the indirect parent company of the Sponsor, holds a minority interest (less than 1.0%) in Kraken, one of the Digital Asset Trading Platforms included in the Index.
• Grayscale Securities, LLC, an affiliate of the Sponsor, is an Authorized Participant for the Trust.
• Jane Street Capital, LLC and Virtu Americas LLC are Authorized Participants and are affiliates of JSCT, LLC and Virtu Financial Singapore Pte. Ltd., respectively, which are Liquidity Providers.
• The Sponsor and its affiliates manage several other digital asset investment vehicles, potentially creating conflicts of interest in resource allocation.

Stakeholder Impact

• Shareholders: Potential for increased liquidity and broader market access through NYSE Arca listing. Potential for additional returns from staking rewards if implemented. Exposure to significant market volatility and regulatory risks. Limited voting rights and restricted ability to bring derivative actions.
• Authorized Participants: Will continue to facilitate creation and redemption of Baskets, benefiting from arbitrage opportunities. May face challenges if liquidity is limited or if they serve competing products.
• Sponsor (Grayscale Investments Sponsors, LLC): Benefits from the Sponsor's Fee (0.35% annual) and potential Sponsors Staking Fee. Bears responsibility for ordinary course expenses and management of the Trust. Faces risks from market volatility and regulatory changes.
• Custodial Entities (Coinbase, Inc. and Coinbase Custody Trust Company, LLC): Provide critical custody and prime broker services, earning fees from the Sponsor. Exposed to security risks and potential liability limitations.
• Sui Foundation: Potential to become a majority shareholder through a private offering, gaining significant influence over the Trust's governance, subject to a one-year lock-up.

Next Steps

• The Trust intends to list its Shares on NYSE Arca under the symbol GSUI.
• The Sponsor will continue efforts to satisfy the 'Staking Condition' to enable the Trust to engage in staking activities.
• The Sponsor expects to implement a staking policy with respect to the Trust, describing the frequency and conditions of distributions from staking rewards.
• Ongoing regulatory compliance and monitoring of the digital asset market will be maintained.

Key Dates

Recommendation

The Grayscale Sui Trust's planned conversion to an ETF and listing on NYSE Arca, coupled with the potential for staking rewards, presents a compelling growth narrative and improved accessibility for investors. The competitive 0.35% sponsor fee and temporary waiver are attractive. However, the significant volatility of SUI, the current inability to engage in staking due to unmet conditions, and the broader regulatory uncertainties in the digital asset market introduce substantial risks. The potential for a single entity (Sui Foundation) to hold a majority of shares also warrants caution regarding governance. Given these balanced factors, a 'hold' recommendation is appropriate, advising investors to monitor the progress of the ETF listing, the satisfaction of staking conditions, and the evolving regulatory landscape before making further investment decisions.

Keywords

Grayscale, Sui, SUI, ETF, Staking, Digital Asset, Cryptocurrency, SEC Filing, S-1/A, NYSE Arca, Investment Trust, Blockchain, Proof-of-Stake, Coinbase, Financial Services