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

Grayscale Sui Trust (SUI) filed an S-1/A, detailing its planned conversion to a staking ETF and listing on NYSE Arca, while disclosing financial performance and significant risks.

Summary

• Grayscale Sui Trust (SUI) plans to rename itself 'Grayscale Sui Staking ETF' and list its Shares on NYSE Arca, Inc. 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.
• As of December 31, 2025, approximately 3,737 million SUI have entered circulation, with an aggregate market value of $5.2 billion, making it the twenty-third largest digital asset by market capitalization.
• The Trust currently does not engage in staking, as the 'Staking Condition' (regulatory and tax clarity) has not yet been met, but intends to stake up to 100% of its SUI holdings once permissible.
• Shares are issued and redeemed in 'Baskets' of 10,000 Shares, through both in-kind and cash orders, with an arbitrage mechanism expected to link Share value to the Index Price.
• The Sponsor, Grayscale Investments Sponsors, LLC, is responsible for daily administration and pays most ordinary course expenses, but extraordinary expenses are borne by the Trust.
• The Trust's SUI is held by Coinbase Custody Trust Company, LLC, as custodian, in cold storage with multi-layered security protocols.
• For the nine months ended September 30, 2025, the Trust reported a net realized and unrealized loss on investment in SUI of $2,779 thousand, driven by SUI price depreciation from $4.17 to $3.26 per SUI.
• The Trust's net assets decreased by 20% to $10,103 thousand for the nine months ended September 30, 2025.
• Historically, Shares have traded at both premiums and discounts to NAV per Share, with a maximum premium of 38% and a maximum discount of 30% between November 24, 2025, and December 31, 2025.

Sentiment

Score: 4

Explanation: StockSavvy.ai views this filing with cautious optimism. While the planned NYSE Arca listing and potential for staking offer future upside, significant past underperformance, SUI price volatility, and ongoing regulatory uncertainties surrounding digital assets and staking present considerable risks.

Positives

• The Trust intends to list its Shares on NYSE Arca, which could enhance liquidity and provide investors with an efficient means to implement investment strategies.
• The planned conversion to a 'Staking ETF' and engagement in staking activities, once the 'Staking Condition' is met, could generate additional SUI for the Trust.
• The Trust employs robust security measures, including cold storage for private keys, geographical distribution of key shards, and multi-signature requirements, to protect its SUI assets.
• The arbitrage mechanism, facilitated by Authorized Participants, is designed to keep the value of the Shares closely linked to the SUI Index Price.
• The Sponsor assumes and pays most ordinary course operational and periodic expenses of the Trust, reducing the direct cost burden on the Trust's assets.

Negatives

• The Trust has not yet met its investment objective, and Shares quoted on OTCQB have historically traded at substantial premiums and discounts to NAV per Share.
• The 'Staking Condition' has not been met, prohibiting the Trust from engaging in staking activities and potentially placing it at a comparative disadvantage to direct SUI investments or other staking vehicles.
• SUI prices have experienced extreme volatility, which could materially adversely affect the value of the Shares.
• The digital asset markets are largely unregulated and lack transparency, exposing the Trust to risks of fraud, market manipulation, business failures, and security issues.
• Shareholders have limited voting rights and restricted ability to bring derivative actions, with almost all control vested in the Sponsor and Trustee.
• The Trust's reliance on third-party service providers (Custodian, Prime Broker, Liquidity Providers) introduces operational risks, and their replacement could be challenging.
• The amount of the Trust's assets represented by each Share will decline over time due to the payment of the Sponsors Fee and Additional Trust Expenses.
• Shareholders may incur tax liabilities from SUI transfers or sales to cover expenses, even without receiving corresponding distributions from the Trust.

Risks

• Extreme volatility of SUI trading prices could cause the Shares to lose all or substantially all of their value.
• The medium-to-long term value of Shares is uncertain due to the recency and evolving nature of blockchain technologies and digital assets.
• Concentrated ownership of SUI and large sales by holders could adversely affect its market price.
• The largely unregulated nature and lack of transparency of Digital Asset Trading Platforms may lead to fraud, market manipulation, business failures, or security problems.
• Validators may suffer losses due to staking (e.g., slashing penalties), or staking may become unattractive, adversely affecting the Sui Network.
• A temporary or permanent fork or clone of the Sui Network could adversely affect the value of the Shares, and the Sponsor's choice of the 'true' network may not be the most valuable.
• The lack of active trading markets for Shares may result in losses upon 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 (e.g., SEC classifying SUI as a security, money service business regulation) could adversely affect the Trust or lead to its termination.
• Changes in SEC policy, including approval of competing SUI ETFs, could reduce demand for the Trust's Shares.
• Foreign regulatory changes could restrict digital asset use or validating activity, negatively impacting SUI value.
• Security threats to the Trust's Vault Balance or Settlement Balance could result in loss of assets or halting of operations.
• SUI transactions are irrevocable; stolen or incorrectly transferred SUI may be irretrievable.
• Lack of full insurance and limited legal recourse against service providers expose the Trust to loss of SUI.
• The Trust may be forced to terminate and liquidate at a disadvantageous time for shareholders.
• Staked SUI tokens will be inaccessible for a variable period, creating liquidity risk for the Trust.
• The regulatory landscape surrounding staking is uncertain, with potential for it to be deemed an unregistered security offering.
• Potential conflicts of interest may arise between the Sponsor/its affiliates and the Trust, as the Sponsor has no fiduciary duties beyond the Trust Agreement's scope.
• DCG, the Sponsor's indirect parent, holds a minority interest in Kraken, one of the Digital Asset Trading Platforms included in the Index, potentially raising concerns about market data influence.
• The Trust is an emerging growth company, and its reduced disclosure requirements may make Shares less attractive to some investors.

Future Outlook

The Trust intends to issue Shares on an ongoing basis and list them on NYSE Arca under the symbol GSUI. It plans to rely on an SEC exemption to operate a redemption program. The Sponsor anticipates engaging in staking activities with the Trust's SUI holdings to receive additional SUI, but only if the 'Staking Condition' (regulatory and tax clarity) is satisfied. The Sponsor expects the arbitrage mechanism to keep the Shares' value closely linked to the Index Price, with net creations during premiums and net redemptions during discounts.

Management Comments

• The Sponsor believes that the security procedures in place for the Trust, including offline storage, multiple encrypted private key shards, usernames, passwords, and 2-step verification, are reasonably designed to safeguard the Trust's SUI.
• The Sponsor intends to take the position that the Trust is properly treated as a grantor trust for U.S. federal income tax purposes, even if it engages in staking activities.
• The Sponsor has committed to causing the Trust to irrevocably abandon any Incidental Rights and IR Virtual Currency to which the Trust may become entitled in the future.
• 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.

Industry Context

StockSavvy.ai notes that the digital asset industry continues to experience extreme volatility and regulatory scrutiny, as evidenced by past insolvencies (Celsius, Voyager, Three Arrows Capital, FTX) and SEC enforcement actions against major trading platforms (Binance, Coinbase, Kraken). The emergence of central bank digital currencies (CBDCs) and financial institution initiatives leveraging blockchain technology could increase competition for SUI. SUI, launched in 2023, faces competition from more established digital assets like Bitcoin and Ether, as well as other smart contract platforms such as Ethereum, Polkadot, Avalanche, and Cardano. Coinbase Global, the Trust's custodian and prime broker, also serves several competing SUI exchange-traded products, highlighting a concentrated service provider landscape.

Comparison to Industry Standards

• SUI's market capitalization of $5.2 billion as of December 31, 2025, positions it as the twenty-third largest digital asset, significantly smaller than Bitcoin and Ether, which are more established in the market.
• The Trust's proposed listing on NYSE Arca aligns with a trend of digital asset products seeking listing on major exchanges, similar to Grayscale Bitcoin Trust ETF and Grayscale Ethereum Trust ETF.
• The Trust's fee structure and competitive positioning will be compared to other spot SUI exchange-traded products, some of which have already received SEC approval or have applications pending.
• The use of Coinbase Custody Trust Company, LLC as a qualified custodian for SUI is consistent with industry best practices for institutional digital asset custody, similar to other Grayscale products.
• The historical trading of the Trust's Shares at premiums and discounts to NAV per Share (e.g., 38% max premium, 30% max discount between Nov 24, 2025, and Dec 31, 2025) indicates a divergence from the tight tracking often seen in more mature ETF markets for traditional assets.

Management Changes

Corporate Governance

Legal Proceedings

• Osprey Funds, LLC filed a lawsuit against the Sponsor on January 30, 2023, alleging violations of the Connecticut Unfair Trade Practices Act (CUTPA). The Sponsor's motion for summary judgment was granted on February 7, 2025, and Osprey withdrew the action and appeal on May 12, 2025.
• Genesis Global Capital, LLC and Genesis Asia Pacific Pte. Ltd. filed a complaint on May 19, 2025, against Digital Currency Group, Inc. (DCG) and its affiliates, including GSO, alleging preferential transfers of 105 BTC and 37,647.06 ETC (valued at approximately $12.6 million as of September 30, 2025). GSO believes the lawsuit is without merit and intends to vigorously defend against it.

Related Party Transactions

• Digital Currency Group, Inc. (DCG) is the sole equity holder and indirect parent company of the Sponsor, and also holds a minority interest (less than 1.0%) in Kraken, one of the Digital Asset Trading Platforms included in the Index.
• The Sponsor and its professional staff also service other affiliated digital asset investment vehicles, potentially leading to conflicts in resource allocation.
• Grayscale Securities, LLC, an affiliate of the Sponsor, is the only Authorized Participant currently party to a participant agreement with the Sponsor and the Trust.
• The Sponsor may engage other affiliated service providers in the future, potentially creating disincentives to replace them even if better unaffiliated options exist.
• Officers of the Sponsor may trade SUI for personal accounts, potentially taking positions opposite to or ahead of the Trust, subject to internal policies.

Stakeholder Impact

• Shareholders: May experience losses due to SUI price volatility, historical trading at premiums/discounts, and potential tax liabilities without corresponding distributions from staking. Limited voting rights and restricted derivative actions reduce their influence.
• Authorized Participants: Benefit from arbitrage opportunities but bear compliance burdens (broker-dealer registration, AML/KYC) and risks associated with market illiquidity or operational failures.
• Custodian (Coinbase Custody Trust Company, LLC) and Prime Broker (Coinbase, Inc.): Provide critical security and transaction facilitation services, but their liability is limited, and their insolvency could lead to significant losses for the Trust.
• Sponsor (Grayscale Investments Sponsors, LLC): Manages the Trust, assumes most ordinary expenses, and seeks to achieve the investment objective, but faces potential conflicts of interest due to its affiliated entities and other business ventures.
• Regulatory Authorities (SEC, CFTC, FinCEN): The Trust's operations are subject to evolving regulatory frameworks, and adverse determinations (e.g., SUI as a security) could significantly impact or terminate the Trust.

Next Steps

• The Sponsor intends to rename the Trust as 'Grayscale Sui Staking ETF' by filing a Certificate of Amendment to the Certificate of Trust.
• The Trust intends to list the Shares on NYSE Arca under the symbol GSUI.
• The Trust intends to rely on an exemption or other relief from the SEC under Regulation M to operate a redemption program.
• The Sponsor will continue efforts to satisfy the 'Staking Condition' to enable the Trust to engage in staking activities.
• If the 'Staking Condition' is satisfied, the Sponsor expects to implement a staking policy and enter into Staking Arrangements with the Custodian and third-party staking providers.

Key Dates

Recommendation

The Trust presents a mixed outlook. While the planned NYSE Arca listing and potential for staking could improve liquidity and generate additional returns, the historical trading at a discount to NAV, significant SUI price volatility, and the ongoing regulatory uncertainty surrounding digital assets and staking introduce substantial risks. The current inability to engage in staking until the 'Staking Condition' is met also limits its immediate upside. Investors should 'hold' existing positions and monitor regulatory developments and the implementation of staking, as these factors will be critical to future performance.

Keywords

SUI, Grayscale, ETF, Staking, Digital Asset, Cryptocurrency, SEC Filing, NYSE Arca, Investment Trust, Blockchain, Proof-of-Stake, Coinbase Custody, Arbitrage, Regulatory Risk, Market Volatility