US spot Bitcoin ETFs cut 2026 YTD net outflows by 66% after BTC gained ≈25% in August, and Ether ETFs turned positive YTD at $732M. But daily flow data turned mixed again: BTC ETFs saw a $236.5M net outflow on Sept 1, then a $101.1M inflow on Sept 2, while spot ETH ETFs had a $48.2M outflow on Sept 2.
Matters because: The strong August trend still looks constructive, but the latest daily reversal suggests institutional demand may be cooling short term, which could pressure BTC price stability.