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Bitcoin ETF flows: $2.420 billion by the end of September

The net inflows of US spot bitcoin ETFs reached $2.73 billion from September 1 to 28, 2026, according to data from Farside Investors. August ended at $3.52 billion. But September doesn’t look like August: $2.42 billion—that is, 88% of the total—came in over six sessions, from September 21 to 28. Cointribune has reconstructed the two months session by session to show this.

+$2.73 billion: net flows of bitcoin ETFs from September 1 to 28, across 19 sessions (Farside Investors, TFTC).

+$313.5 million in just the first 13 sessions, then +$2.42 billion in the next 6.

+$3.52 billion in August, across 21 sessions, 16 of them positive.

What do bitcoin ETF flows measure?

A spot bitcoin ETF is an exchange-traded fund that holds bitcoin. When investors buy shares, the fund creates new shares and buys bitcoin. Net flow is the difference between these creations and redemptions, in dollars, for a given session. Cointribune tracked the timing of when the 2026 flows returned to being positive.

The figures in this article add up the daily flows of all spot bitcoin ETFs listed in the United States. From September 10 to 28, they come from Farside Investors’ table. For August and early September, they come from TFTC, which compiles the same reported flows. Both series match within 0.1 million on the common dates.

How does September compare with August?

August rose steadily. Sixteen of the 21 sessions were positive. The highest, on August 20, contributed $606.3 million. The worst, on August 28, cost $201.8 million.

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