U.S. spot Bitcoin exchange-traded funds recorded their largest weekly outflow in months, pulling in a net $1 billion for the week that ended May 15, 2026.
The reversal, detailed in fresh data from SoSoValue, ended a six-week run of steady inflows that had signaled renewed institutional appetite for the cryptocurrency. The figures come as Bitcoin traded around $79,000 during early hours on Saturday, hovering near recent support levels after a choppy stretch.
On the final trading day of the week alone, the 11 Bitcoin ETFs logged $290.42 million in net outflows. Not a single fund posted a positive flow that day, according to the tracker.
Cumulative net inflows since the products launched in January 2024 still stand at roughly $58.34 billion, with total assets under management reaching $104.29 billion.
Outflows Accelerate Amid Mid-May Pressure
The weekly total marks a sharp turn from the prior period. For the week ended May 8, the ETFs took in $622.75 million. That followed another positive week ending May 1 at $153.87 million, and stronger prints earlier in April that included $823.70 million for the week of April 24 and nearly $1 billion for the week of April 17.
Daily data paints an even clearer picture of the shift. Outflows began building earlier in the week, with $635 million leaving the funds on May 13 and another $233 million on May 12.
The SoSoValue chart tracking daily flows shows a series of red bars in mid-May, contrasting with the green spikes that defined much of April and early May. Total assets, while still elevated, slipped slightly from recent peaks as the selling pressure mounted.
The timing of this mammoth outflow aligns with broader crypto price action. Bitcoin has struggled to sustain decisively above the $80,000 level in recent weeks, trading in a range that has tested investor conviction. Higher Treasury yields and mixed economic signals have also weighed on risk assets, prompting some portfolio rebalancing.
Cumulative Strength Masks Short-Term Caution
Even with the weekly setback, the longer-term picture for Bitcoin ETFs remains one of accumulation. BlackRock’s iShares Bitcoin Trust (IBIT) continues to dominate flows and holdings, underscoring the staying power of major institutional players.
The products have absorbed billions in net new money through multiple cycles of volatility since their debut more than two years ago.
The latest outflow week echoes earlier dips seen in March and February 2026, when weekly red figures also topped several hundred million dollars before inflows resumed. Such swings are believed to be dynamic in a maturing market where ETFs now serve as a primary on-ramp for traditional capital.
Still, the $1 billion weekly exit is the largest since late January and comes after a period of relative calm. Some market participants point to profit-taking after the strong April run, while others cite macro headwinds including upcoming inflation data and Federal Reserve commentary.
Ethereum ETFs, for their part, also saw outflows of $255.11 million this week, extending a five-day negative streak and adding to the sense of sector-wide caution.
Whether this marks the start of a deeper pullback or merely a pause remains to be seen. ETF flows have proven remarkably resilient since launch, weathering price drops and headline noise alike.
With total assets now above $100 billion, even sizable weekly moves represent a smaller slice of the overall pie than they did in the products’ first year.Investors will be watching next week’s numbers closely.
A return to inflows could signal that the mid-May wobble was temporary, driven more by positioning than a fundamental shift in demand. Currently, the data shares a reminder that while Bitcoin ETFs have cemented themselves as a core institutional tool, they remain sensitive to the same forces that move the underlying asset.
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