Brown Brothers Harriman & Co. is a custodian firm based in New York, New York that brown brothers harriman (bbh) is one of the oldest and largest privately held partnerships in the united states, founded in 1818. it provides investor services including global custody, fund administration and asset servicing to asset managers and financial institutions, alongside private banking, wealth management and investment management. a proposed sale of its investor services business to state street was terminated in late 2022, and bbh remains a partner-owned firm across the americas, europe and asia. They serve clients in United States, Europe, Asia. Brown Brothers Harriman & Co. is listed on The Token Playbook's vetted provider registry at thetokenplaybook.com/registry/brown-brothers-harriman-co.