BlackRock's iShares Bitcoin Trust (IBIT) recorded $665.16 million in net inflows on October 19, its largest single-day intake since October 7, 2025. Across all U.S. spot $BTC ETFs, the same trading session ended with approximately $526.6 million in net inflows, because withdrawals from competing funds offset part of IBIT's gain.The distinction matters: $665 million describes one fund, not the entire ETF market. Fidelity's FBTC lost about $83.6 million and Grayscale's GBTC about $54.9 million, while the other nine funds were flat. The session therefore showed concentrated demand for IBIT rather than uniform buying across every issuer.U.S. spot $ETH ETFs moved in the opposite direction, recording roughly $103.3 million in net outflows that day. These figures measure reported ETF fund flows, not confirmed direct purchases or sales by individual institutions, and do not establish what caused Bitcoin's price movement.