US Bitcoin ETF flows were roughly flat to slightly negative on Sept 8 (-$57.3M single-day by one tracking method, alongside a separate report of +398 BTC net inflow). Cumulative 2026 ETF flows remain about $1 billion in net redemptions as of Sept 8. Ether ETFs saw a larger single-day outflow of roughly 19,667 ETH, even as the 7-day trend stayed net positive (+15,939 ETH).
Matters because: Institutional demand is stabilizing but not yet strongly bullish, which may limit near-term upside for BTC and ETH absent a fresh catalyst.