Spot bitcoin ETFs log $2.7 billion in September inflows as institutional demand holds
US spot bitcoin ETFs finished September with $2.65 billion in net inflows, their second-largest monthly total since October 2025. The month also ended with a one-day outflow on 30 September after nine straight days of inflows, while the positive monthly streak reached three months.
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Bitcoin ETF holders and traders tracking the sector saw September close with another month of net inflows, and the last trading day of the month showed a $148.7 million outflow after a nine-day inflow run. That means activity stayed concentrated in regulated Bitcoin funds through the month, even though the final day broke the streak.
Compared with earlier months, the practical change is that September added to a three-month stretch of positive monthly flows while ending below August's $3.52 billion total. What stayed the same was that the products still attracted billions in net new money, so the basic pattern of monthly inflows remained in place.
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