Key Takeaways:
21Shares filed a prospectus update for TSUI, its spot SUI ETF on Nasdaq, as assets neared $13.3 million and a benchmark switch looms at month-end.
21Shares filed a Form 424B3 prospectus supplement with the SEC for TSUI, its spot ETF tracking SUI, the native token of the Sui blockchain, as the fund's assets approached $13.3 million roughly six months after listing.
The filing, submitted on or around Aug. 13, updates the fund's original prospectus with fresh financials and material changes, including a planned switch of its pricing benchmark away from CF Benchmarks effective Aug. 31, according to the SEC document.
TSUI launched on Nasdaq on Feb. 24, holding SUI directly rather than through futures or derivatives, so performance tracks the token price without the drag of rolling contracts. As of early August the fund held about $13.3 million in assets with a net asset value near $13.50 per share, while share count grew from roughly 910,000 at the end of June to about 980,000 by Aug. 7. The expense ratio sits at 0.30 percent, meaning a $10,000 position costs about $30 a year.
The benchmark change is the most consequential disclosure. The benchmark sets the official price used to calculate NAV daily, and a different provider can use a different method, source prices from different exchanges, or apply different weighting, producing slightly different valuations for the same token. The 10-Q filed Aug. 12 names FTSE International as the incoming provider, with the switch not expected to materially affect NAV or SUI fair-value measurement.
The quarterly 10-Q shows the fund's NAV fell 16.26 percent to $12.64 million in the quarter ended June 30, driven by a 20.45 percent drop in SUI's price from $0.88 to $0.70. Since initial seeding on Nov. 18, 2025, NAV per share has fallen from $33.72 to $13.89, a total return of negative 58.68 percent, as SUI slid from $1.69 to $0.70.
Staking cushions the decline. The trust staked an average of 95.74 percent of its SUI daily in the quarter, generating $46,205 in net staking rewards, which funded cash distributions of $53,100.67, or $0.064705 per share, paid in May and June. The sponsor takes a 0.30 percent annual fee plus 25 percent of net staking rewards.
TSUI is not 21Shares' first Sui product. The firm launched a leveraged SUI ETF, ticker TXXS, in December 2025, before the spot fund existed — the reverse of the usual sequence, suggesting the issuer had confidence in regulatory approval well before TSUI actually listed.
At $13.3 million in assets, TSUI is small by ETF standards; most funds below $50 million face questions about long-term viability as operating costs eat into thin asset bases. The growth from 910,000 to 980,000 shares over roughly five weeks is modest but directionally positive, and the Sui Foundation's 10 million SUI seed position remains locked up for a year from the November closing.
The benchmark switch to FTSE, a provider with less crypto index history than CF Benchmarks, is worth watching for how it recalibrates daily NAV. For investors, the filing confirms a functioning staking yield on a single-asset altcoin ETF, but the 58.68 percent total loss since seeding underscores the concentration risk of holding one token through a drawdown.
This article is for informational purposes only and does not constitute investment advice.
