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Exhibit 21

Subsidiaries of the Registrant

The following is a list of the subsidiaries of NB Bancorp, Inc.:

Name

State of Incorporation

Needham Bank

Massachusetts

Needco-op Investment Corporation, Inc.(1)

Massachusetts

Easton Square Realty LLC (1)

Massachusetts

1892 Investments LLC (1)

Massachusetts

Provident Security Corporation (1)

Massachusetts

5 Market Street Security Corporation (1)

Massachusetts

(1)

Wholly owned subsidiary of Needham Bank