On September 21, US spot Bitcoin ETFs recorded $998.96 million in net inflows, the largest single-day total of 2026. BlackRock IBIT led with $381.4 million, followed by ARKB at $289.1 million and FBTC at $238.8 million. These three funds accounted for the overwhelming majority of the day’s net buying. This figure represents a single-day flow and not a cumulative total. The coming sessions will determine whether this was an isolated allocation surge or the start of sustained institutional demand.
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