US spot Bitcoin ETFs record $998.96 million in single-day net inflows

On September 21, US spot Bitcoin ETFs saw a combined net inflow of $998.96 million, marking a new single-day record for 2026. BlackRock's IBIT led the inflows with $381.37 million, followed by ARK Invest's ARKB with $289.12 million and Fidelity's FBTC with $238.84 million. Other contributors included Morgan Stanley's MSBT ($61.67 million), Bitwise's BITB ($21.56 million), Grayscale's GBTC ($3.34 million), and Grayscale's BTC ($3.06 million).