BlackRock just made its biggest single Bitcoin transfer ever, sending 7,432 BTC to Coinbase Prime alongside 8,150 ETH. At current prices, the Bitcoin portion alone accounts for roughly $446 million in value, making it the largest on-chain movement tied to BlackRock’s ETF operations to date.
What actually happened
The transfer, which occurred in June 2026, involved assets moving from BlackRock’s custody to Coinbase Prime, the institutional arm of Coinbase that serves as the custodian and settlement layer for BlackRock’s iShares Bitcoin Trust (IBIT) and its Ethereum ETF counterpart.
When investors redeem shares of IBIT, the underlying assets get routed through Coinbase Prime as part of a standardized settlement process. The Bitcoin and Ethereum move on-chain, on-chain trackers pick it up, and crypto Twitter loses its collective mind.
The timing isn’t random. IBIT experienced a near-record $528 million net outflow in late May 2026, making it the second-largest single-day outflow the fund has seen since a peak back in January 2026. June has continued that trend, with multi-day outflow streaks totaling billions across US spot Bitcoin products. IBIT has consistently accounted for the largest share of those outflows.
