U.S. spot Bitcoin exchange-traded funds narrowly returned to positive territory for the week through Sept. 18 after a $433 million surge on Friday erased nearly all of the outflows recorded earlier in the week. The group finished with $6.2 million in net inflows, a sharp reversal from a $426.8 million deficit heading into the final trading session.
The late recovery came after an unusually volatile sequence of daily fund movements. Bitcoin ETFs added $160 million on Monday, then lost $450.3 million on Tuesday and another $296 million on Wednesday. Thursday brought $159.5 million in net inflows, but Friday delivered the decisive change in direction.
Friday’s $433 million inflow was the strongest daily result for the Bitcoin ETF category since Sept. 3, when the funds attracted $730.9 million. It also followed a prior week in which the group recorded $462.7 million in net outflows.
Fidelity and BlackRock drive Friday’s reversal
Fidelity Wise Origin Bitcoin Fund (FBTC) accounted for $310.7 million of Friday’s inflows, making it the largest contributor to the day’s turnaround. BlackRock’s iShares Bitcoin Trust (IBIT) followed with $108.4 million.
Smaller inflows were also recorded by products managed by Bitwise, VanEck, and Ark Invest and 21Shares. The distribution of Friday’s buying showed that the rebound was led principally by the two largest contributors rather than spread evenly across the full ETF lineup.
Over the full week, IBIT finished first with $120.7 million in net inflows, while FBTC added $79.9 million. The other spot Bitcoin ETFs collectively posted about $194.4 million in net outflows, leaving the category only slightly above break-even.
The pattern gives the week a different character from a broad-based return of demand. Friday’s activity was strong enough to offset four sessions of uneven flows, but the narrow weekly result indicates that withdrawals persisted in several competing products even as IBIT and FBTC attracted fresh capital.
Bitcoin ETF assets remain above $100 billion
U.S. spot Bitcoin ETFs held $102.53 billion in net assets on Friday, with cumulative net inflows of $55.16 billion since the products launched. Despite those long-term figures, the category was down about $1.45 billion in net flows year to date, according to the supplied fund-flow data.
Weekly trading activity rose substantially. Bitcoin ETF trading volume reached $16.17 billion, compared with $8.77 billion in the preceding week. The comparison includes an important calendar effect: the previous week had only four trading sessions because of the Labor Day holiday.
Higher volume alongside rapidly changing daily flows points to active repositioning rather than a settled directional view. ETF flows do not map directly onto Bitcoin’s price movements, but they provide a visible measure of demand and redemptions in one of the largest regulated channels for U.S. Bitcoin exposure.
The week also showed how quickly headline fund totals can obscure divergent behavior beneath the surface. A small positive weekly figure can result from significant inflows and outflows cancelling each other out, rather than from consistently positive demand. That was especially clear in the Bitcoin products, where Tuesday’s $450.3 million withdrawal was followed within days by Friday’s $433 million intake.
Ether ETFs break a four-week inflow streak
U.S. spot Ether ETFs did not match the late-week recovery in Bitcoin funds. The Ether group recorded a $140 million net outflow for the week, ending a four-week stretch of net inflows.
Three consecutive losing sessions from Tuesday through Thursday produced $404.8 million in withdrawals. Friday brought $143.8 million in net inflows, reducing the weekly loss but falling well short of reversing it.
BlackRock’s iShares Ethereum Trust (ETHA) led Friday’s recovery with $114.3 million in inflows. Fidelity Ethereum Fund (FETH) added $26.2 million. Both funds nevertheless finished the week in negative territory: ETHA posted $56.1 million in net outflows for the week, while FETH lost $25.8 million.
The Ether ETF category has now recorded its first negative week since the week ending Aug. 14. It remained positive for the year, with about $922 million in net inflows, while cumulative inflows since launch stood at $13.25 billion. Net assets were $16.72 billion as of Friday.
Volume rises even as Ether funds see withdrawals
Ether ETF trading volume increased to $6.82 billion during the week from $5.14 billion in the shortened prior week. The gain occurred despite the negative weekly flow result, showing that higher turnover does not necessarily translate into net new allocations.
Bitcoin and Ether ETF flows moved differently by the end of the week. Bitcoin products recovered enough to finish marginally positive, aided by large allocations to FBTC and IBIT. Ether funds attracted money on Friday but retained a meaningful weekly deficit after heavier withdrawals earlier in the period.
That divergence places the two largest U.S. spot cryptocurrency ETF segments on different short-term footing. Bitcoin funds ended the week with renewed, though concentrated, buying interest, while Ether ETFs face the first interruption in their month-long run of weekly inflows.
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