Bitcoin, Ethereum ETFs Grew $23 Billion Last Week—Only $2.6 Billion Was New Money

In brief

• U.S. spot Bitcoin and Ethereum ETFs added $2.6 billion in net inflows for the week ending August 21, their best week since October 2025, while total assets under management jumped roughly $23 billion.
• Bitcoin ETF assets rose 25.4% to $96.1 billion and Ethereum ETF assets rose 35.9% to $14.3 billion, according to SoSoValue data.
• Bitcoin gained about 24% and Ethereum about 30% during the week after the Treasury doubled a bond-buyback program and a short squeeze wiped out billions in bearish bets.

U.S. spot Bitcoin and Ethereum ETFs picked up roughly $23 billion in total value last week. Only $2.6 billion of that came from new money. Everything else came from Bitcoin and Ethereum simply getting more expensive.

That distinction may get lost in the euphoria of a market rally. A crypto fund's total value—what's called assets under management, or AUM—grows for two separate reasons: fresh cash coming in the door, or the coins already sitting inside becoming worth more. Last week, almost all of the growth was the second kind.

Spot Bitcoin ETFs added $1.92 billion in net inflows for the week ending August 21, while Ethereum funds took in $697.2 million. Combined, that $2.6 billion was the strongest week for both fund categories since October 2025, when Bitcoin was closing in on its all-time high.