The bank custody race: who holds America’s Bitcoin

Wall Street did not wake up one morning and decide it liked Bitcoin. It woke up and realized the custody fees were too large to leave on someone else’s balance sheet. Summary Citigroup announced Custody+ on Aug. 18, folding Bitcoin into the same rails that hold $34.5 trillion in traditional assets, with a live launch expected before year end 2026. BNY Mellon, the world’s largest custodian at $59.4 trillion in assets under custody, already holds crypto for ETF issuers and expanded Bitcoin and Ethereum custody to Abu Dhabi in May 2026. Coinbase Custody manages $376 billion in institutional crypto assets and serves as custodian for more than 80% of U.S. spot Bitcoin and Ethereum ETFs, making it the single largest target if banks bundle custody with prime brokerage. The regulatory runway cleared in 2025 when the SEC rescinded SAB 121 and the OCC confirmed that national banks may custody crypto without prior approval, removing the two largest barriers to bank entry. Only roughly 1% of all cryptocurrency by market value carries insurance coverage, creating a protection gap that neither banks nor crypto natives have solved and that could define the next wave of competition. For most of th...