Bitcoin ETFs Just Had Their Biggest Day Since May—BlackRock Took 83% of It

In brief

• U.S. spot Bitcoin ETFs took in $606.29 million on August 20, their largest single-day haul since May 1 and a fourth straight day of inflows.
• BlackRock's IBIT accounted for $502.99 million of that—about 83%, up from 55% the day before, while VanEck's HODL posted an outflow.
• Ethereum funds added $221 million, XRP $13 million, and Solana $15 million, with every listed asset drawing money.

U.S. spot Bitcoin ETFs pulled in $606.29 million on Thursday, their biggest single-day haul since May 1, according to SoSoValue. That beats Wednesday's $517.19 million and extends the inflow streak to four sessions.

The four-day run—$297.56 million Monday, $189.30 million Tuesday, then Wednesday and Thursday—comes to roughly $1.61 billion in all. August now stands at $2.07 billion, the best month of 2026, beating April's $$1.97 billion, with seven trading sessions left to close the gap.

One fund took almost all of it

Bitcoin ETFs are financial instruments that give investors exposure to an asset without directly owning it. In the case of Bitcoin ETFs, the issuer of the fund holds the coin, and the investor owns a 1:1 equivalent, gaining exposure to the price of Bitcoin in real time.

These funds have been extremely popular among investors since they launched in early 2024, with the biggest fund issuer of them all—the $15 trillion asset manager BlackRock—as the primary beneficiary.