U.S. spot Bitcoin ETFs recorded $433 million in net inflows on Friday, Sept. 18, led by Fidelity's $310.7 million contribution. The inflow extended a two-day rebound, but the funds finished the five-session week with only $6.1 million in net inflows after earlier withdrawals. BlackRock's IBIT still attracted more capital than Fidelity's FBTC over the full week.