Bitcoin, Ether ETFs draw $3B in strongest inflow week since October

US spot Bitcoin and Ether ETFs just had the kind of week that makes fund managers sleep soundly. Combined net inflows hit $2.6 billion for the week ending August 21, marking the strongest weekly performance for both product categories since October 2025.

Trading volume across the funds surpassed $29 billion, more than tripling from the prior week. The previous week saw roughly $392 million in net outflows, representing a swing of approximately $3 billion in a single week.

Bitcoin leads, Ether follows

Bitcoin ETFs did the heavy lifting, pulling in nearly $1.9 billion and accounting for about 73% of the total haul. Bitcoin fund trading volume alone reached approximately $22.1 billion, an increase of more than 219% week over week.

Net assets under management for Bitcoin ETFs climbed to $96.1 billion, a 25.4% jump driven by both fresh capital and underlying price appreciation. Since their launch in early 2024, cumulative net inflows for Bitcoin ETFs have now reached roughly $53.7 billion.

Ether ETFs recorded about $697 million in net inflows, representing their largest weekly total of 2026. The combined $2.6 billion week marked the largest weekly inflow total of the entire year for both fund types.

The uncomfortable year-to-date picture

Despite this blockbuster week, both Bitcoin and Ether ETFs remain negative on a year-to-date basis, currently tracking toward their first full year of net outflows since inception.

Bitcoin ETFs debuted in January 2024 to record-setting demand, with Ether ETFs following later that year. Both products attracted billions in their early months, with institutional and retail investors racing to gain regulated exposure to crypto.

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