State Street is a custodian firm based in Boston, Massachusetts that state street is a boston-based financial services company and one of the world's largest custodian banks and asset servicers, trading on the nyse as stt. it provides custody, fund administration and investment servicing, overseeing tens of trillions of dollars in assets, and also operates state street global advisors. the firm is expanding into digital assets and tokenization through its digital asset platform and industry partnerships. They serve clients in United States, Global. State Street is listed on The Token Playbook's vetted provider registry at thetokenplaybook.com/registry/state-street.