U.S.-listed spot Bitcoin ETFs recorded roughly $450 million in net outflows on September 15, led by Fidelity's FBTC and BlackRock's IBIT. SoSoValue reported $450 million in aggregate withdrawals, while Farside data put the figure at $450.4 million, making it the largest daily outflow since June 24. FBTC lost about $215 million and IBIT about $162 million; Farside also recorded withdrawals from Grayscale's GBTC, ARKB and BITB. Total net assets across spot Bitcoin ETFs stood at $95.72 billion, equivalent to 6.28% of Bitcoin's market capitalization, while cumulative historical net inflows reached $54.86 billion. The outflow followed $159.9 million of inflows on the prior day and coincided with Bitcoin trading at $75,700, down 2.5% over 24 hours. The withdrawals came after the CLARITY Act failed to advance in the Senate.