Spot Bitcoin ETFs shed $166M in two days as investors hit pause after weeks of inflows

US spot Bitcoin ETFs just snapped a three-week inflow streak, with investors pulling roughly $166.8 million across September 8 and 9. The move came as Bitcoin prices sat in the $78,000 to $79,000 range, a zone that apparently gave institutional allocators enough reason to trim rather than add.

The entire spot Bitcoin ETF complex has attracted approximately $55.45 billion in cumulative net inflows since the products launched in early 2024, and total assets under management sit at around $99.3 billion.

Where the money left

The selling accelerated sharply on the second day. September 8 saw net outflows of $46.6 million, according to data from SoSoValue and Farside Investors. September 9 nearly tripled that figure, with $120.2 million walking out the door.

Ark 21Shares’ ARKB was the biggest culprit, shedding approximately $78 million on September 9 alone.

Grayscale’s GBTC added another $27.2 million to the exit pile. BlackRock’s iShares Bitcoin Trust (IBIT) recorded $19.5 million in outflows.

The lone holdout was Morgan Stanley’s MSBT, which pulled in $4.5 million across the two-day stretch.

Context matters more than the number

A $166.8 million outflow represents roughly 0.17% of the total assets sitting in US spot Bitcoin ETFs.

GBTC’s continued outflows are a more structural story. The fund has been bleeding assets since it converted from a trust structure, as investors who were locked in at a discount to NAV for years finally got the chance to exit. That process has been ongoing for over two years now, and while the pace has slowed considerably from the early days, GBTC remains a persistent source of net negative flow in the category.

The $99.3 billion in total ETF assets also creates its own gravitational pull. As the category approaches the psychologically significant $100 billion milestone, the likelihood of renewed institutional interest increases.