Exhibit 21 Subsidiaries of the Registrant The following is a list of the subsidiaries of Provident Bancorp, Inc. Name State of Incorporation Provident Bank United States of America Provest Services Corp. New York (inactive) Provest Services Corp. I New York Provest Services Corp. II New York Provident REIT, Inc. New York Provident Municipal Bank New York Shawangunk Holding Co., Inc. New York (inactive) 107