U.S. spot Bitcoin ETFs recorded $288.7 million in net outflows on September 15, according to Farside Investors, reversing the previous session's $159.9 million inflow. Fidelity's FBTC led withdrawals with $214.8 million, while BITB, ARKB and GBTC also posted redemptions, making the session the largest net outflow since July 13, when the group lost $424.7 million.