Bitcoin ETFs absorb about 11,530 BTC in biggest day since 2024

US spot Bitcoin ETFs recorded $999 million in net inflows on Sept. 21, their largest daily total since Oct. 6, 2025, when the products attracted about $1.2 billion, according to SoSoValue data. The inflows were the strongest daily total of 2026. Measured in Bitcoin, the funds absorbed about 11,530 BTC, their largest one-day net intake since Nov. 11, 2024, when they added roughly 12,560 BTC. Bitcoin rose above $86,000 and briefly traded above $87,000, its highest level since January. BlackRock's iShares Bitcoin Trust, or IBIT, led with $381.4 million in inflows. The ARK 21Shares Bitcoin ETF, or ARKB, received $289.1 million, while Fidelity's Wise Origin Bitcoin Fund, or FBTC, received $238.8 million. The three funds accounted for more than $909 million of the total, and Bloomberg Intelligence ETF analyst Eric Balchunas said each of the six largest products contributed. Balchunas said IBIT's inflow ranked as its fourth-largest daily intake. He described the uneven pattern of recent creations as constructive and said irregular inflow days better reflect dispersed investor activity than allocations driven by a single large model or institution. The size of the creations contrasted with secondary-market activity. Bloomberg Intelligence ETF analyst James Seyffart said the US spot Bitcoin ETFs traded about $4.5 billion during the latest session, slightly below the roughly $4.6 billion recorded Friday. Balchunas said much of the roughly $1 billion inflow probably reflected trading and creation activity from Friday because fund flows are reported with a lag. He said the next disclosures may better show how investors responded after Bitcoin accelerated through $86,000. If Monday's rally generated another wave of creations, the ETFs could extend a reversal from the outflows that weighed on the market earlier this year and provide a sustained source of spot demand as Bitcoin approaches $90,000.