US spot Bitcoin funds ended their best month in 2026 with net inflows of 3,522.8 million dollars, then opened September with outflows of 236.5 million in a single session. The common reading treats the former as evidence that institutional money drove the price, and the latter as a warning. The evidence across 678 sessions says something simpler: fund flows move with today's and yesterday's price, and say nothing about tomorrow's price. What appears to be a collective decision by “the funds” is, in 88% of cases, the decision of one fund.
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