US spot Bitcoin ETFs collectively hold about $78 billion in assets under management, with BlackRock’s iShares Bitcoin Trust (IBIT) commanding approximately $47.5 billion of that total. A single fund from the world’s largest asset manager now controls roughly 61% of all Bitcoin sitting inside US spot ETF wrappers.
Since launching in January 2024, IBIT has pulled in between $50 billion and $63 billion in net inflows.
The numbers behind Bitcoin’s institutional takeover
As of mid-July 2026, the total holdings across all US spot Bitcoin ETFs amount to over 1.2 million BTC. That’s roughly 5.77% of Bitcoin’s entire circulating supply, locked up in regulated investment vehicles that didn’t even exist two and a half years ago.
IBIT’s $47.5 billion in net assets makes it the undisputed heavyweight in the category. Fidelity’s FBTC sits in second place, with Grayscale’s GBTC rounding out the top three, though neither has come close to matching BlackRock’s scale or velocity of growth.
