U.S. spot Bitcoin ETFs drew $999 million in net inflows on September 21, 2026, per SoSoValue data, with BlackRock’s IBIT leading at $381 million. The attached chart shows a sharp green inflow spike to nearly $999 million as the largest 2026 daily total, pushing combined BTC ETF assets above $110 billion at a BTC price near $86,490. Spot Ether ETFs added $270 million the same day, led by BlackRock’s ETHA at $110 million, marking the strongest combined institutional demand for major crypto ETFs in 11 months.
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