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Spot Bitcoin exchange-traded funds recorded $433 million in total net inflows on Sept. 18, while spot Ethereum ETFs added another $144 million on the same session, bringing combined daily inflows across both wrappers to roughly $577 million. The flow was led by Fidelity's FBTC with $311 million and BlackRock's IBIT with $108 million on the BTC side, while BlackRock's ETHA pulled in $114 million and Fidelity's FETH added $26.24 million on the ETH side.
Why it matters
The composition of the inflows is the real story. Two issuers, Fidelity and BlackRock, led both the BTC and ETH sides of the tape, evidence the institutional appetite is broad rather than concentrated in a single product. Spot ETH ETFs are still relatively young wrappers, so a $144M session with BlackRock's ETHA doing most of the heavy lifting is a meaningful directional signal that allocators are layering ETH exposure alongside BTC.
Market impact
A combined $577M session is not an outlier; it sits inside a multi-week cadence that has structurally raised the floor under both wrappers. Watch the BTC-to-ETH split: BTC still dominates by roughly 3:1, but a session where both tickers print strong flows in the same day suggests allocators are treating the pair as a single institutional allocation rather than picking one over the other.
Frequently asked questions
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How much did spot Bitcoin ETFs pull in on Sept. 18?
Spot Bitcoin ETFs recorded $433 million in total net inflows on Sept. 18, led by Fidelity's FBTC with $311 million and BlackRock's IBIT with $108 million.
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Which Ethereum ETF led inflows on Sept. 18?
BlackRock's ETHA led spot Ethereum ETF inflows on Sept. 18 with $114 million, followed by Fidelity's FETH at roughly $26.24 million, for a combined $144 million session.
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Why is the composition of ETF inflows important?
When Fidelity and BlackRock lead both the BTC and ETH sides of the flow tape, it shows institutional appetite is broad across issuers rather than concentrated in a single product.
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What does a $144M ETH ETF session signal?
Spot ETH ETFs are still relatively young wrappers, so a $144M session with BlackRock's ETHA doing most of the heavy lifting is a directional signal that allocators are layering ETH exposure alongside BTC.
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How do BTC and ETH ETF flows compare?
The Sept. 18 split was roughly 3:1 in favor of BTC, but both tickers printed strong flows on the same day, suggesting allocators may be treating the pair as a single institutional allocation rather than picking one over the other.
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