US Spot Bitcoin ETFs Take In Nearly $1B, Absorbing 11,500 BTC in Biggest Buying Day in Almost Two Years

US spot Bitcoin exchange-traded funds drew in close to $1 billion as Bitcoin rallied above $86,000, posting their strongest inflow day of 2026. SoSoValue data show the group recorded $999 million in net inflows on Sept. 21, the largest daily haul since Oct. 6, 2025, when the products attracted about $1.2 billion. In Bitcoin terms, the move was even larger: the ETFs took in roughly 11,530 BTC, their biggest one-day net intake since Nov. 11, 2024, when they added about 12,560 BTC. The buying coincided with Bitcoin pushing through $86,000 and briefly trading above $87,000, its highest level since January. BlackRock's iShares Bitcoin Trust (IBIT) led the day with $381.4 million of net inflows. It was followed by the ARK 21Shares Bitcoin ETF (ARKB) at $289.1 million and Fidelity's Wise Origin Bitcoin Fund (FBTC) at $238.8 million. Combined, the three accounted for more than $909 million of the total. Bloomberg Intelligence ETF analyst Eric Balchunas said each of the six largest products contributed to the day's inflows. For IBIT, Balchunas noted the $381 million figure marked its fourth-largest daily intake. Balchunas also described the recent pattern of creations as uneven but constructive, arguing that irregular inflow days tend to reflect broad-based investor activity rather than flows driven by a single large model or institution. Large creations, ordinary trading volume The size of the reported inflows stood out against secondary-market activity. Bloomberg Intelligence ETF analyst James Seyffart said US spot Bitcoin ETFs traded about $4.5 billion during the latest session, slightly below the roughly $4.6 billion recorded Friday. The relatively ordinary turnover contrasted with Bitcoin's sharp move and the scale of the inflow print. The timing also complicates efforts to tie Monday's ETF figures directly to Bitcoin's breakout. Balchunas said much of the nearly $1 billion inflow likely reflects trading and creation activity from Friday because fund flows are reported with a lag. He said the next round of disclosures may better capture how investors responded once Bitcoin accelerated through $86,000. "Look for more tonight," Balchunas said. That puts added focus on the next session. If Monday's rally triggered another wave of creations, the ETFs could extend a sharp reversal from the outflows seen earlier this year and provide a steadier source of spot demand as Bitcoin approaches $90,000. The post Bitcoin ETFs just absorbed 11,500 BTC in their biggest buying day in nearly two years appeared first on CryptoSlate.