State Street Corporation, is a global financial services and bank holding company headquartered at One Congress Street in Boston with operations worldwide. It is the second-oldest continually operating United States bank; its predecessor, Union Bank, was founded in 1792. State Street is ranked 14th on the list of largest banks in the United States by assets. It is one of the largest asset management companies in the world with US$3.7 trillion under management and US$40.0 trillion under custody and administration in 2023. It is the largest custodian bank in the world, providing securities services and it is considered a systemically important bank by the Financial Stability Board. Along with BlackRock and Vanguard, State Street is considered to be one of the Big Three index fund managers that dominate corporate America.

The Vanguard Group, Inc., is an American registered investment advisor based in Malvern, Pennsylvania, with about $7.7 trillion in global assets under management, as of April 2023. It is the largest provider of mutual funds and the second-largest provider of exchange-traded funds (ETFs) in the world after BlackRock's iShares. In addition to mutual funds and ETFs, Vanguard offers brokerage services, educational account services, financial planning, asset management, and trust services. Several mutual funds managed by Vanguard are ranked at the top of the list of US mutual funds by assets under management. Along with BlackRock and State Street, Vanguard is considered to be one of the Big Three index fund managers that play a dominant role in corporate America.