U.S. spot Bitcoin ETFs recorded $433.03 million in net inflows on September 18, 2026, according to SoSoValue data. The reading was notable as the second consecutive trading day of net inflows for the group, with Fidelity’s FBTC responsible for the largest disclosed fund-level gain.
Data Snapshot
| Metric | Current | Previous | Change | Period | As of | Source |
|---|---|---|---|---|---|---|
| U.S. spot Bitcoin ETF net inflows | $433.03 million | — | — | September 18, 2026 | 2026-09-18 | KuCoin citing SoSoValue |
| Fidelity Wise Origin Bitcoin Fund (FBTC) net inflows | $310.72 million | — | — | September 18, 2026 | 2026-09-18 | CoinDesk |
| BlackRock iShares Bitcoin Trust (IBIT) net inflows | $108.44 million | — | — | September 18, 2026 | 2026-09-18 | CoinDesk |
| Spot Ethereum ETF net inflows | $144.8 million | — | — | September 18, 2026 | 2026-09-18 | KuCoin citing SoSoValue |
Fidelity’s FBTC led September 18 Bitcoin ETF inflows
Fidelity Wise Origin Bitcoin Fund, trading under the ticker FBTC, brought in $310.72 million in net inflows during the session. That made FBTC the leading disclosed contributor to the aggregate $433.03 million total.
BlackRock’s iShares Bitcoin Trust, IBIT, recorded a further $108.44 million in net inflows on September 18. The fund-level readings show that the day’s positive total was concentrated in two of the largest named products in the data provided, led by FBTC.
The $433.03 million figure represents net flows across U.S. spot Bitcoin ETFs, not flows into a single fund, and Gate News reported that September 18 was the group’s second straight trading day of net inflows.
Spot Ethereum ETFs recorded $144.8 million in net inflows
U.S. spot Ethereum ETFs separately registered $144.8 million in net inflows on September 18, according to SoSoValue data. This is a distinct product category from spot Bitcoin ETFs, so the Ethereum figure should not be combined with the Bitcoin total.
Both reported totals were positive for the same session, while the Bitcoin products’ $433.03 million reading marked their second consecutive day of net inflows.
Disclaimer: This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.
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