Spot Bitcoin ETFs Absorb 11,530 BTC, Biggest Day Since 2024

US spot Bitcoin ETFs absorbed 11,530 BTC on Sept. 21, recording about $999 million in net inflows, the largest single-day BTC intake since Nov. 11, 2024, when ETFs added roughly 12,560 BTC. The inflows were led by BlackRock, ARK and Fidelity.

BlackRock’s iShares Bitcoin Trust (IBIT) recorded $381.4 million of the inflows, ARK 21Shares Bitcoin ETF (ARKB) took in $289.1 million, and Fidelity’s Wise Origin Bitcoin Fund (FBTC) added $238.8 million. Those three products accounted for more than $909 million of the reported total, and each of the six largest US spot Bitcoin ETFs posted net creations that day.

Bitcoin’s price moved through $86,000 and briefly traded above $87,000, its highest level since January. In dollar terms, the $999 million figure was the largest daily ETF inflow since Oct. 6, 2025, when funds attracted about $1.2 billion.

Secondary-market trading of the ETFs amounted to about $4.5 billion during the session, slightly below roughly $4.6 billion the prior day. ETF analyst James Seyffart observed that turnover was ordinary relative to the price jump and the size of the reported creations.

ETF analyst Eric Balchunas noted that IBIT’s $381.4 million intake ranked among the product’s largest daily receipts and described irregular creation days as consistent with dispersed investor activity rather than a single large allocation. He cautioned that fund-flow reports lag trading and that much of the roughly $1 billion figure likely reflected activity from the previous trading day, and added, “Look for more tonight.”

Market participants will watch subsequent fund-flow disclosures to determine whether multi-issuer buying continues after one large session. Since their launch, US spot Bitcoin ETFs have shown uneven daily flows, with occasional large creation days and periods of outflows.