Fidelity's Bitcoin Fund Leads US Spot ETF Inflows to New Record
US spot Bitcoin ETFs saw significant inflows on September 18, 2026, according to SoSoValue data. The group recorded $433.03 million in net inflows, with Fidelity's FBTC leading the charge with $310.72 million in gains. This marks the second consecutive trading day of net inflows for Bitcoin ETFs.
BlackRock's iShares Bitcoin Trust (IBIT) also saw significant inflows, with $108.44 million in net inflows on September 18. In contrast, spot Ethereum ETFs recorded a more modest $144.8 million in net inflows.
The influx of funds into US spot Bitcoin ETFs is a notable development, and it's the second straight trading day that this group has seen positive flows. Fidelity's FBTC was the largest contributor to these inflows, with its fund-level gains accounting for over 70% of the total.