21Shares has filed a Kind 424B3 prospectus complement with the SEC for TSUI, its spot ETF monitoring SUI, the native token of the Sui blockchain. The submitting, submitted on or round August 13, 2026, updates traders on the fund’s present state roughly six months after it first started buying and selling.
A 424B3 is a routine however significant doc. Consider it because the dwelling model of a fund’s authentic prospectus, up to date with recent financials and any materials adjustments traders have to learn about earlier than shopping for shares.
The place the fund stands
TSUI launched on Nasdaq on February 24, 2026, making it one of many earliest U.S.-listed spot ETFs providing direct publicity to SUI via a regular brokerage account.
As of early August 2026, the fund held roughly $13.3M in property underneath administration, with a web asset worth of round $13.50 per share. Share rely grew from roughly 910,000 on the finish of June to about 980,000 by August 7, an indication that new capital has been flowing into the product.
The expense ratio sits at 0.30%, which is aggressive for a single-asset crypto ETF. For context, meaning an investor holding $10,000 in TSUI pays about $30 per 12 months in administration charges.
The ETF holds SUI straight quite than via derivatives or futures contracts. That construction issues as a result of it means the fund’s efficiency tracks the precise token worth quite than rolling futures contracts, which may create drag over time as a consequence of contango prices.
The benchmark change
One of many extra consequential disclosures within the 424B3 is a deliberate change to the ETF’s pricing benchmark, at the moment managed by CF Benchmarks. That change is ready to take impact August 31, 2026.
Benchmark adjustments in crypto ETFs usually are not trivial. The benchmark determines the official worth used to calculate NAV every day, which in flip impacts how the fund’s efficiency is measured and reported. A special benchmark can use a distinct methodology, pull costs from totally different exchanges, or apply totally different weighting guidelines, all of which may produce barely totally different every day valuations even for the identical underlying asset.
CF Benchmarks has been the dominant index supplier for regulated crypto merchandise within the US, serving because the benchmark administrator for Bitcoin and Ethereum ETFs from a number of issuers. The truth that 21Shares is shifting away from it for TSUI is value watching, although the submitting doesn’t specify which supplier will change it.
Sui’s rising product ecosystem
TSUI just isn’t 21Shares’ first transfer into the Sui ecosystem. The agency launched a leveraged SUI ETF, ticker TXXS, in December 2025, giving extra aggressive merchants amplified publicity to SUI worth actions earlier than the spot product even existed.
The sequencing is fascinating. Leveraged merchandise sometimes comply with spot merchandise, not precede them. 21Shares ran that playbook in reverse for Sui, suggesting the issuer had confidence in regulatory approval for TSUI nicely earlier than the spot fund really launched.
Sui is a Layer 1 blockchain developed by Mysten Labs, an organization based by former Meta engineers who labored on the Diem blockchain venture. The community makes use of a novel object-centric knowledge mannequin and the Transfer programming language, positioning itself as a high-throughput different to Ethereum for consumer-facing functions like gaming and social apps.
What this submitting alerts
At $13.3M in AUM, TSUI is a small fund by conventional ETF requirements. Most ETFs beneath $50M face questions on long-term viability, since working prices can eat into returns when the asset base is skinny. The expansion from 910,000 to 980,000 shares over roughly 5 weeks is modest however directionally optimistic.
