BlackRock's IBIT leads $526.7 million in Bitcoin ETF inflows as Ethereum funds see $103.3 million in outflows

US spot Bitcoin ETFs attracted $526.7 million on Oct. 19, reversing the previous week's withdrawals, with BlackRock's iShares Bitcoin Trust (IBIT) drawing $665.2 million in its strongest session since Oct. 7, 2025. The inflow offset $83.6 million in withdrawals from Fidelity's FBTC and $54.9 million from Grayscale's GBTC. Conversely, US spot Ethereum ETFs lost $103.3 million on the same day, with BlackRock's ETHA accounting for $95.4 million of the outflows, extending a withdrawal streak that has erased over $1.1 billion over the past 15 trading sessions.