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A 25% August price gain in Bitcoin ($BTC) cut year-to-date net outflows from US spot Bitcoin ETFs by 66%, making August the product class's strongest calendar month of 2026.
Ether ETFs crossed into positive YTD territory at $732 million. The flow read The 66% figure is the controlling ratio.
US spot Bitcoin ETFs entered August carrying net outflows for the year; the rally compressed that deficit by two-thirds over a single month.
A 25% move in the underlying tends to suppress redemption pressure while pulling re-entry flows at the same time, and the August data reflects both effects. That ratio also confirms what the number does not flip.
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