Spot crypto ETFs explained: how bitcoin, ether and altcoin funds work

What a spot crypto ETF is

An exchange-traded fund (ETF) is a pooled vehicle whose shares trade on a stock exchange. A spot crypto ETF holds the underlying digital asset itself, rather than futures contracts, so its value tracks the asset’s market price minus fees.

The first US spot bitcoin ETFs began trading in January 2024, and spot ether ETFs followed in July 2024. For allocators, the appeal is operational: exposure fits inside existing custody, compliance, reporting and tax workflows, with no private keys to manage.

One structural detail matters. Most of these funds are grantor trusts registered under the Securities Act of 1933, not investment companies under the Investment Company Act of 1940. BlackRock’s own fund page for its bitcoin trust states that it is not subject to the same regulatory requirements as 1940 Act funds. A few products, such as the first spot XRP and dogecoin funds launched by REX Shares and Osprey Funds in September 2025, use a 1940 Act structure instead.

How the plumbing works

ETF shares are created and redeemed in large blocks by authorized participants (APs), typically large broker-dealers. This mechanism keeps the share price close to the fund’s net asset value (NAV), the value of its holdings per share.

• Cash creations. The AP sends cash, and the fund (or its trading counterparty) buys the crypto. All US spot bitcoin and ether ETFs launched this way.
• In-kind creations. The AP delivers the crypto itself and receives ETF shares, or the reverse on redemption. The SEC approved in-kind creations and redemptions for crypto ETPs in late July 2025, aligning them with other commodity-based products. SEC Chairman Paul Atkins said the change would make the products “less costly and more efficient.”
• Custodians. The coins sit with a qualified custodian, mostly in offline cold storage. Coinbase Custody is the custodian for many of the largest funds, which creates concentration that allocators should note.
• Fees. Sponsors charge an annual expense ratio deducted from fund assets. BlackRock’s iShares Bitcoin Trust (IBIT) lists 0.25% as of October 2, 2026. Older converted trusts have historically charged more, so fee comparison is worth doing fund by fund.

The market by the numbers

Bitcoin funds dominate the category, with ether a distant second and newer altcoin funds still small. Figures below are point-in-time and move with prices and flows.

IBIT alone holds well over half of US spot bitcoin ETF assets on these figures. Other large bitcoin funds include Fidelity’s FBTC, Ark/21Shares’ ARKB and Grayscale’s GBTC, and Morgan Stanley’s MSBT appeared among the leading weekly inflows in late September 2026. On the ether side, BlackRock’s ETHA and Fidelity’s FETH led inflows in the same week.

Generic listing standards and the altcoin wave

Until 2025, each new spot crypto ETF required the SEC to approve an individual exchange rule filing (a 19b-4), a process that could take up to 240 days. On September 17, 2025, the SEC approved generic listing standards for Nasdaq, NYSE Arca and Cboe BZX. A fund now qualifies if its underlying asset meets set criteria, most notably having a futures contract listed for at least six months on a CFTC-regulated market. Review times fell to as little as 75 days.

Launches followed quickly. Bitwise’s Solana fund (BSOL) began trading on NYSE Arca on October 28, 2025, under the new standards, and Canary Capital funds for Litecoin and Hedera became effective the same day. As of late September 2026, both SOL and XRP funds were drawing steady inflows: Benzinga reported that over the 11 weeks to September 25, SOL funds took in about $469 million versus about $306 million for XRP funds. These remain small next to bitcoin and ether, and liquidity in some products is thin.

Staking inside ETFs

Staking means locking proof-of-stake tokens such as ether or SOL to help validate the network in exchange for rewards. US funds can now pass part of that yield to shareholders.

• Grayscale launched the first US spot ether ETFs with staking in October 2025.
• BlackRock launched the iShares Staked Ethereum Trust (ETHB) on March 12, 2026, as a separate fund from ETHA. Its prospectus targets staking 70% to 95% of holdings, it distributes rewards in cash monthly, and it retains 18% of staking rewards as a fee, according to etf.com.
• Several SOL funds, including BSOL, stake from launch.

Net yield depends on how much of the fund is staked, reward-sharing fees and network conditions. Staking rewards are generally taxed as ordinary income under current IRS guidance. Staking also adds liquidity risk, because unstaking takes time and funds must keep a buffer to meet redemptions.

How to read flows

Flow data reports net creations minus redemptions, usually in dollars, by fund and by day. Trackers such as SoSoValue and Farside compile it from issuer disclosures. Useful habits:

• Look at trends, not single days. One large day can be a single institution rebalancing.
• Separate price from flows. Assets under management (AUM) can fall while flows are positive if prices drop.
• Remember the basis trade. Some inflows come from hedge funds buying ETF shares and shorting futures to capture a spread, which is not directional demand.
• Check filings for holders. Quarterly 13F filings show which advisers, pensions and funds own shares, with a lag.

Risks versus holding directly

• Price risk. The ETF carries the full volatility of the asset. IBIT reported a year-to-date return of about negative 33% as of October 2, 2026.
• Counterparty and custody concentration. Investors rely on the sponsor, custodian, APs and market makers rather than controlling keys themselves.
• Trading hours and tracking. Crypto trades around the clock, while ETFs trade during exchange hours, so shares can open at a gap to NAV after weekend moves.
• Fees and drag. Expense ratios and staking fees compound over time; self-custody has its own costs but no sponsor fee.
• No on-chain utility. ETF holders cannot use the asset for payments, collateral or governance.
• Regulatory and structural risk. Rules for staking, listing and market structure are still evolving, including after the Clarity Act’s failed Senate vote in September 2026.

Sources and further reading

• The Block: bitcoin and ether ETF flows and assets, SoSoValue data (September 26, 2026)
• iShares Bitcoin Trust (IBIT) fund page (figures as of October 2, 2026)
• etf.com: SEC approves in-kind crypto ETF creations and redemptions (July 2025)
• The Block: SEC approves generic listing standards; first XRP and DOGE ETFs launch (September 2025)
• etf.com: BlackRock enters the ether staking ETF market with ETHB (March 2026)
• SoSoValue US spot bitcoin ETF flow dashboard