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Exhibit 21
Subsidiaries of Eastern Bankshares, Inc.

As of March 2, 2026, the Registrant owned the following subsidiaries:

NameState of IncorporationNames under which Subsidiary does Business
Eastern BankMassachusettsEastern Bank
Broadway Securities CorporationMassachusettsBroadway Securities Corporation
Real/Property Services, Inc.MassachusettsReal/Property Services, Inc.
Millennium CorporationMassachusettsMillennium Corporation
Shared Value Investments LLCMassachusettsShared Value Investments LLC, Eastern Bank
High Street Securities CorporationMassachusettsHigh Street Securities Corporation
Cambridge Trust Company of New Hampshire Inc.
New Hampshire
Cambridge Trust Wealth Management, a division of Eastern Bank
Rhode Island Passive Investment Corp.Rhode IslandRhode Island Passive Investment Corp