Bitcoin ETF inflows hit $3 billion in eight days as institutions return

US spot Bitcoin ETFs took in approximately $3 billion in net inflows between September 17 and September 25, 2026. That stretch ranks among the strongest buying periods since the funds launched in January 2024. The burst did something months of grinding could not. It pushed the year’s flow tally out of the red. Hedge funds, often cast as the fast money behind ETF surges, appear to have played only a minor role this time. The buying looks more like a broad institutional return than a trading desk making a short-term bet. The numbers behind the rally The peak week alone delivered $2.4 billion in net inflows. That was the largest weekly haul since October 2025. BlackRock’s IBIT led the pack with around $1.2 billion during that peak week. Fidelity’s FBTC added roughly $702 million, while ARK 21Shares’ ARKB brought in about $295 million. The biggest single day came on September 21, 2026, when inflows hit nearly $999 million. The rebound matters most against where flows stood earlier in the year. By mid-July, the funds were sitting on a year-to-date deficit of about $5.8 billion. By late September, that hole had become a modest net positive of about $934 million. The flows lined up with B...