Here is the latest update regarding US spot BTC ETF activity for Wed, Sep 30, 2026.

Spot Bitcoin ETFs encountered a midweek reversal, posting flows of -$148.7m on Wednesday. This downward shift occurred right after the funds experienced two positive sessions to start the week.

Withdrawals from FBTC were the primary driver behind Wednesday's outflows. As a result of this recent activity, overall week-to-date flows have now dropped into a slightly negative position, currently resting at -$51.5m.