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US Spot Bitcoin ETFs Record $450.4 Million in Net Outflows on September 15

U.S. spot Bitcoin ETFs registered $450.4 million in net outflows on September 15, marking the largest single-day withdrawal since late June.

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The 13 U.S.-listed spot Bitcoin ETFs recorded net outflows totaling $450.4 million on Tuesday, September 15, 2026, according to Farside Investors. The redemptions reversed the $159.9 million in net inflows registered on September 14 and marked the highest single-day net withdrawal since June 24, 2026, when the funds lost $469 million.

Withdrawals were concentrated primarily in two products. Fidelity's FBTC led outflows with $214.8 million in net redemptions, followed by BlackRock's IBIT with $161.7 million. Grayscale's GBTC posted $44.1 million in outflows, Ark Invest's ARKB saw $17.4 million, and Bitwise's BITB recorded $12.4 million in withdrawals.

The large outflows coincided with Bitcoin falling 2.5% over a 24-hour window to $75,700, as well as the failure of the CLARITY Act to advance in the U.S. Senate. The report notes that while these events occurred at the same time, available data does not confirm a direct causal link.

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