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US Spot Bitcoin ETFs Attract $433 Million in Net Inflows Led by Fidelity

American spot Bitcoin ETFs registered over $433 million in net additions on September 18, marking a second straight day of positive flows.

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United States spot Bitcoin exchange-traded funds recorded $433.03 million in aggregate net inflows on September 18, 2026, according to data from SoSoValue. The session marked the second consecutive trading day of positive net flows for the investment products.

The gains were heavily concentrated in Fidelity's Wise Origin Bitcoin Fund (FBTC), which accounted for $310.72 million of the day's total. BlackRock’s iShares Bitcoin Trust (IBIT) generated the second-largest volume, taking in $108.44 million during the same session.

Separately, U.S. spot Ethereum ETFs registered $144.8 million in net inflows on September 18. Both fund categories posted positive numbers during the session, reflecting broad participation across the two asset classes.

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