Key Takeaways
- • Grayscale Bitcoin Mini Trust ETF (NYSE Arca: BTC) carries a 0.15% annual sponsor fee, below IBIT's 0.25% and GBTC's 1.50%, according to the CryptoSlate review.
- • The fund reported $5,313,285,328 in assets as of Sep 24, 2026 (non-GAAP AUM on investor NAV; GAAP AUM $5,313,688,935) and a 30-day median bid/ask spread of 0.03%.
- • Coinbase is the primary custodian and Anchorage Digital holds an undisclosed portion of assets; the review notes Coinbase's setoff language still refers to undefined Sponsor Assets and recovery is subject to contract limits.
- • Individual shareholders cannot redeem for Bitcoin; selling produces brokerage cash, and only authorized participants use the creation and redemption process.
- • The review stresses that the low fee does not reduce Bitcoin price risk, with losses capable of far exceeding annual fee savings.
Summary
CryptoSlate's review of the Grayscale Bitcoin Mini Trust ETF (NYSE Arca: BTC) sets out the fund's cost, custody and structural profile as of late September 2026. The fund is a commodity trust holding spot Bitcoin, not registered under the Investment Company Act of 1940. Its annual sponsor fee is 0.15%, applied to assets less liabilities, with terms checked on Sep 13, 2026 and effective from Apr 1, 2026. The fund began trading on July 31, 2024 after a spin-off from GBTC and operates as a separate security. Its valuation reference is the CoinDesk Bitcoin Benchmark Rate, which replaced the CoinDesk Bitcoin Price Index (XBX) on April 1, 2026.
Issuer-published data show a 30-day median bid/ask spread of 0.03% as of Sep 24, 2026, and reported assets of about $5.31 billion. CryptoSlate's own rating of 9.5/10 weights costs at 30%, spread at 25%, custody at 20%, scale at 10% and reporting at 15%. The review cautions that this score reflects public fund terms and does not signal low risk.
Custody is split between Coinbase, the primary custodian, and Anchorage Digital, which holds a portion of assets that Grayscale does not quantify. The review notes that Coinbase's custody protections cover ownership recording and negligence-based responsibility, while recovery remains limited by contract terms and setoff language. Individual shareholders cannot redeem shares for Bitcoin and receive brokerage cash on sale.
According to the review, a $10,000 holding would incur $15 in annual sponsor fees at BTC's rate, versus $25 at IBIT and $150 at GBTC, excluding price movement and trading costs. The review also flags that buy-sell spreads and brokerage fees add to total cost and that the fund's share price can trade at a premium or discount to NAV.
Issuer-published data show a 30-day median bid/ask spread of 0.03% as of Sep 24, 2026, and reported assets of about $5.31 billion. CryptoSlate's own rating of 9.5/10 weights costs at 30%, spread at 25%, custody at 20%, scale at 10% and reporting at 15%. The review cautions that this score reflects public fund terms and does not signal low risk.
Custody is split between Coinbase, the primary custodian, and Anchorage Digital, which holds a portion of assets that Grayscale does not quantify. The review notes that Coinbase's custody protections cover ownership recording and negligence-based responsibility, while recovery remains limited by contract terms and setoff language. Individual shareholders cannot redeem shares for Bitcoin and receive brokerage cash on sale.
According to the review, a $10,000 holding would incur $15 in annual sponsor fees at BTC's rate, versus $25 at IBIT and $150 at GBTC, excluding price movement and trading costs. The review also flags that buy-sell spreads and brokerage fees add to total cost and that the fund's share price can trade at a premium or discount to NAV.
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