According to @FarsideUK, BlackRock’s iShares Bitcoin Trust (IBIT) recorded a US$100.7 million net outflow on Oct 21, 2025, based on Farside Investors’ U.S. Bitcoin ETF daily flow tracker (source: Farside Investors). The iShares Bitcoin Trust uses cash creations and redemptions, so on net outflow days the Trust sells bitcoin to raise cash for redemptions (source: iShares Bitcoin Trust prospectus, BlackRock/iShares). Net outflow indicates redemptions exceeded creations, resulting in a net reduction of ETF-held bitcoin for the day (source: iShares Bitcoin Trust prospectus, BlackRock/iShares). Historical daily flows for all U.S. spot Bitcoin ETFs are available for context and comparison (source: Farside Investors).