What are the big 3 custodian banks?

Written by Editorial Team | Last Updated: August 2026

Global financial markets and institutional asset management operations rely heavily on three massive custody banks that safeguard trillions of dollars in securities, provide institutional accounting, and facilitate international trade settlements. The first is The Bank of New York Mellon, universally recognized as the world's largest custodian bank, boasting an unprecedented volume of assets under custody and administration. The second is State Street Corporation, a Boston-based financial services giant that provides specialized investment servicing, asset management, and comprehensive trading tools for institutional clients globally. The third is JPMorgan Chase, which operates a premier securities services division alongside its massive commercial and investment banking operations. These three financial institutions form the critical operational infrastructure underpinning the global capital markets.

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