BlackRock’s iShares Bitcoin Trust ETF has turned what was once a competitive race into something closer to a victory lap. As of June 26, 2025, IBIT reported approximately $44.87 billion in assets under management, holding 742,870 Bitcoin on behalf of its investors. Fidelity’s Wise Origin Bitcoin Fund, the product most often cited as its nearest competitor, sits somewhere between $10.4 billion and $13.5 billion in AUM. That is not a close race.
Both products launched in January 2024, after the US Securities and Exchange Commission approved spot Bitcoin ETFs, a moment that reshaped how institutional capital could access crypto markets.
How IBIT got here
IBIT reached $10 billion in AUM faster than any prior ETF after its launch, a milestone that made clear this product was not a niche curiosity. For context, most ETFs spend years trying to cross $1 billion, a threshold sometimes called the point where a fund becomes financially viable for its issuer.
Liquidity matters enormously in ETF investing, and this is where IBIT’s scale creates a self-reinforcing advantage. Deeper trading volumes mean tighter bid-ask spreads, which means lower real-world costs for investors executing large orders. Once a fund becomes the liquidity leader, it tends to stay that way, because everyone who cares about execution quality migrates toward the most liquid option.
