Blackrock’s IBIT Approaches 600,000 BTC as ETF Reserve Growth Accelerates

Three Bitcoin ETFs Now Hold Nearly 1 Million Bitcoins Combined

Since January 11, 2024, U.S. spot Bitcoin ETFs have attracted $38.43 billion in inflows, with last week’s additions contributing $30.6 billion to the total, according to data compiled by sosovalue.com. On Friday alone, Blackrock’s IBIT received $240 million, further increasing its reserves. As of April 27, 2025, the Blackrock portal shows that IBIT holds 588,686.91 BTC, which converts to $55.3 billion at Bitcoin’s valuation on Sunday.

There are currently approximately 19.85 million BTC in circulation, with IBIT holding 2.97% of the circulating supply. Fidelity’s FBTC holds 199,684.83 BTC, valued at $18.76 billion, while Grayscale’s GBTC stores 191,190.971 BTC, which is approximately $17.9 billion as of Sunday, April 27. These three funds are the only ETFs with more than 100,000 Bitcoins, collectively overseeing 979,562.711 BTC, valued at $92 billion. IBIT, FBTC, and GBTC together manage 4.93% of the circulating supply of Bitcoin.

Only three other funds hold more than 35,000 Bitcoins each, including Ark Invest’s ARKB, which holds 52,604 Bitcoins. Grayscale’s Bitcoin Mini Trust holds 42,079.29 BTC, while Bitwise’s BITB maintains 39,020.06 BTC in reserves as of April 27. Combined, these three hold a total of 133,703.35 BTC, valued at approximately $12.5 billion, a relatively small 0.67% of the current supply of 19.85 million. The other six funds — HODL, BRRR, BTCO, EZBC, BTCW, and DEFI — hold a combined 32,646.156 BTC, valued at just over $3 billion based on current exchange rates.

In total, U.S. spot Bitcoin ETFs hold a total of 1,145,912.217 Bitcoins, worth $107.7 billion as of April 27. This reserve corresponds to 5.77% of the 19.85 million BTC in existence. When taking into account the holdings of international ETFs and public and private companies, the amount of Bitcoin committed to long-term storage increases significantly.