US spot Bitcoin exchange-traded funds (ETFs) pulled in nearly $1 billion as BTC broke above $86,000, marking their strongest inflow day of 2026.

The funds recorded $999 million of net inflows on Sept. 21, the largest daily total since Oct. 6, 2025, when the products attracted about $1.2 billion, according to SoSoValue data .

Measured in Bitcoin, the move was even more pronounced. The ETFs absorbed about 11,530 BTC, their largest one-day net intake since Nov. 11, 2024, when they added roughly 12,560 BTC. The latest buying came as Bitcoin surged through $86,000 and briefly traded above $87,000, its highest level since January.

BlackRock’s iShares Bitcoin Trust ( IBIT ) led with $381.4 million, followed by $289.1 million for the ARK 21Shares Bitcoin ETF ( ARKB ) and $238.8 million for Fidelity’s Wise Origin Bitcoin Fund ( FBTC ).

The three accounted for more than $909 million of the total, while each of the six largest products contributed, Bloomberg Intelligence ETF analyst Eric Balchunas said .

For IBIT, the $381 million inflow ranked as its fourth-largest daily intake, Balchunas said. He pointed to the uneven pattern of recent creations as a constructive signal, arguing that irregular inflow days better reflect dispersed investor activity than allocations driven by a single large model or institution.

Meanwhile, the scale of the creations contrasts with 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 stood out against Bitcoin’s sharp price move and the size of the reported inflows.