Banks Race to Capture America’s Bitcoin Custody Market

Wall Street’s largest custodians spent most of the past decade watching Coinbase, BitGo, and Anchorage Digital hold institutional Bitcoin they could not touch themselves. That gap closed fast. In 18 months, BNY Mellon, State Street, Standard Chartered, U.S. Bank, and now Citigroup have launched or committed to launching direct crypto custody. 

The remaining question is not whether banks will hold Bitcoin, but how much business crypto-native custodians keep once they do.

The Rules That Had to Change First

Two regulatory shifts cleared the path, and both trace to specific rule changes rather than a general policy mood shift. The SEC rescinded Staff Accounting Bulletin 121 in January 2025 through SAB 122, eliminating a rule that had forced any firm holding client crypto to record a matching liability on its own balance sheet. 

That accounting treatment made custody an expensive drag on bank capital rather than a fee business, and it had been the single largest deterrent to bank participation since SAB 121 took effect in March 2022.

The Office of the Comptroller of the Currency followed with Interpretive Letters 1183 and 1184, confirming that national banks may custody crypto, execute trades on behalf of custodial clients, and use sub-custodians for digital asset services. 

Letter 1183 also eliminated the requirement that banks obtain supervisory nonobjection before entering crypto custody, a process that previously carried no fixed timeline. 

The GENIUS Act, signed into law in July 2025, added a third piece by creating national trust bank charter pathways, which the OCC used to conditionally approve applications from Circle, Paxos, BitGo, Fidelity Digital Assets, and Ripple by the end of 2025.

Who Is Already Operating

BNY Mellon, the world’s largest custodian at $59.4 trillion in assets under custody by its own reporting, has held Bitcoin and Ether for ETF issuers since 2022 and expanded that service into the Abu Dhabi Global Market in May 2026. 

State Street, the second-largest custody bank, launched its Digital Asset Platform in January 2026 in partnership with Swiss infrastructure provider Taurus, supporting custody and settlement for tokenized funds and stablecoins. 

Standard Chartered is absorbing Zodia Custody, the crypto subsidiary it co-founded with Northern Trust in 2020, in a deal expected to close by the end of August 2026. U.S. Bank moved earlier and more narrowly, focusing on reserve custody and fund administration support for stablecoin issuers rather than a broad institutional custody push.

Citi’s Entry Signals Scale, Not Novelty

Citigroup’s Custody+, unveiled August 18, matters less for what it introduces than for the size of the institution behind it. Citi reported $34.5 trillion in assets under custody and administration as of June 2026, making it the third-largest custodian globally. 

The product bundles Bitcoin custody with real-time settlement, liquidity management, and market data into a single operating environment rather than treating crypto as a separate offering. 

Citi said it will manage key management and wallet infrastructure directly, meaning clients would not handle private keys themselves, with a live launch targeted before the end of 2026.

What the Bundle Threatens for Crypto-Native Firms

Coinbase Custody reports managing approximately $376 billion in institutional crypto assets and says it custodies more than 80% of U.S. spot Bitcoin and Ether ETF assets, figures the company has disclosed itself rather than had independently verified. 

BitGo’s assets under custody crossed $90 billion in mid-2025 by its own account. Together, the leading crypto-native custodians hold an estimated 46% of the global market, according to industry tracking.

The structural risk to those firms is bundling rather than direct competition on custody fees alone. A bank that already handles a client’s traditional securities custody can offer crypto custody, trading, and reporting inside the same relationship, letting it absorb thinner crypto margins because the broader account remains profitable. 

Crypto-native custodians do not have that cross-subsidy available, which is why Coinbase has built out a fuller prime-brokerage stack, including lending and derivatives access, betting that specialized depth outweighs the convenience of a single provider.

The Insurance Gap Nobody Has Closed

Roughly 1% of the crypto market’s total value carries insurance coverage, and that ratio has changed little as the market has grown. Individual custody insurance programs typically top out between $75 million and $320 million, with a small number reaching $1 billion in aggregate, figures that cover only a fraction of the assets many custodians now hold. 

The FDIC proposed, but has not finalized, custody and reserve standards for FDIC-supervised institutions handling crypto in April 2026, and that proposal explicitly excludes digital assets from deposit insurance. 

A bank’s overall balance sheet strength offers some informal reassurance in the event of a custody failure, but that protection is not a contractual guarantee and has not been tested at scale.

An Open Question, Not a Settled Outcome

Whether the largest institutional accounts consolidate around banks offering combined traditional and crypto custody, or continue splitting business toward specialists with deeper crypto-specific technology, remains unresolved. 

Industry estimates put the digital asset custody market near $953 billion in 2026, with projections reaching beyond $4 trillion by 2030, a growth path wide enough that both banks and crypto-native custodians could expand in absolute terms even if their relative market share shifts. 

The clearest signal to watch is whether any major ETF issuer moves its custody from a crypto-native firm to a bank in the coming year, a shift that would indicate institutions are prioritizing the bundle over specialization.