US Spot Bitcoin ETFs Draw $999M in a Day, Largest Since October

U.S. spot Bitcoin ETFs took in $998.95 million on Monday, September 22, 2026, the biggest single-day haul since last October, a sharp reversal from the prior week's record-low $6.2 million weekly inflow, according to SoSoValue and Bloomberg Intelligence. BlackRock's IBIT led with $381.37 million, followed by Ark & 21Shares' ARKB at $289.12 million and Fidelity's FBTC at $238.84 million. Morgan Stanley's MSBT added $61.67 million and Bitwise's BITB $21.56 million. VanEck's HODL and Valkyrie's BRRR recorded nothing. Bitcoin traded near $85,900, about 5% above the estimated ETF cost basis of $81,722 a coin, putting the average U.S. spot fund holder back in profit for the first time since January, per Bloomberg Intelligence's James Seyffart. The funds turned over roughly $4.5 billion, slightly below Friday's $4.6 billion. Cumulative net inflows since launch total $56.16 billion; holdings of $110.14 billion equal 6.30% of Bitcoin's market capitalization.