BlackRock's IBIT Tops 806,700 BTC in Holdings, Valued at $63.7 Billion

BlackRock's iShares Bitcoin Trust (IBIT) has grown its Bitcoin position to 806,700 BTC, worth about $63.7 billion, setting a new all-time high for the world's largest spot Bitcoin ETF. The milestone comes after nine straight trading sessions of net inflows, during which the fund added roughly 21,500 BTC, as Bitcoin trades near $78,000 and demand for regulated exposure continues to build. IBIT now represents around 49% of total US spot Bitcoin ETF assets, keeping it well ahead of Fidelity's FBTC and Grayscale's GBTC. In Q1 2026, the ETF posted net inflows on 48 of 62 trading days, totaling an estimated $8.4 billion. Inflows accelerated in mid-April, with $291.9 million on April 15 and $269.3 million on April 10, according to ETF flow data. That buying pushed the fund's holdings above 800,000 BTC for the first time. The broader US spot Bitcoin ETF category has also shifted back into inflow mode after four months of outflows, taking in about $2 billion over four consecutive weeks of positive net flows. IBIT accounted for approximately $1.7 billion of that total. Despite IBIT's record, MicroStrategy Inc. has retaken the lead as the largest Bitcoin holder, reporting 815,061 BTC on its balance sheet. The company regained a position it had ceded in Q2 2024. The Michael Saylor-led firm has continued to buy aggressively, including the purchase of 13,927 BTC for roughly $1 billion on April 13. The gap between MicroStrategy and IBIT now stands at about 8,300 BTC. BlackRock is also expanding its crypto product lineup. The firm recently filed an amended S-1 with the SEC for a Bitcoin income ETF under the ticker BITA, which would seek to generate yield using a covered-call strategy linked to IBIT. With both IBIT and MicroStrategy continuing to add Bitcoin, competition between the two largest institutional holders could intensify through Q2.