Blackrock Deposits $172m In BTC And ETH To Coinbase Prime

BlackRock Moves $172M in Bitcoin and Ether to Coinbase Prime

@BlackRock has transferred 861 $BTC (roughly $69.59M) and 44,691 $ETH (roughly $103.15M) to Coinbase Prime, bringing the combined value of the transaction to $172.74M. The movement was flagged by on-chain monitoring platform Arkham Intel and is linked to rebalancing activity across the asset manager's spot ETF portfolios, specifically its iShares Bitcoin Trust ($IBIT) and iShares Ethereum Trust ($ETHA).

Coinbase Prime serves as the custodian for BlackRock's spot Bitcoin and Ethereum ETF products. The IBIT annual filing confirms that the trust depends on Coinbase Custody and Coinbase Inc. as Prime Execution Agent for bitcoin buying, selling, settlement, and cash creations and redemptions, which means transfers of this kind are a routine part of how the funds operate rather than a signal of outright selling.

Routine Mechanics, Not a Directional Bet

A deposit to Coinbase Prime does not confirm a sale. The assets could be held in custody, repositioned for rebalancing, or prepared for future execution. Spot crypto ETFs periodically need to adjust holdings based on fund flows, and moving assets to the prime broker is a standard step in that process.

The latest transfer is consistent with a pattern that has repeated throughout 2026. This shift is part of a broader pattern of BlackRock using Coinbase Prime for ETF-related crypto flows. Earlier moves this year have included deposits ranging from tens of millions to several hundred million dollars across both assets, each attributed to similar operational triggers.

BlackRock's digital asset lineup includes the iShares Bitcoin Trust (IBIT) and the iShares Ethereum Trust (ETHA). Those funds have grown rapidly since their launches, with IBIT today managing more than $55 billion in assets and ETHA about $6.5 billion. The scale of those holdings means even routine rebalancing requires large nominal transfers.

Analysts note Coinbase Prime transfers often involve routine custody operations, rebalancing, or institutional client allocations rather than outright liquidation. Without an official statement from BlackRock, the precise intent behind the May 13 deposit remains unconfirmed, but the context points squarely toward standard ETF fund management.

Sources:
CoinCu: BlackRock Deposits ETH and BTC to Coinbase Prime
CoinCentral: BlackRock Shifts $49M of BTC and ETH into Coinbase Prime Custody
CoinDesk: BlackRock moves $300 million in bitcoin and ether to Coinbase Prime