UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the quarterly period ended March 26, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Washington, D.C. 20549 FORM 10-Q (Mark One) For the transition period from ______ to ______ Commission file number 001-40866 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 First Watch Restaurant Group, Inc. (Exact name of registrant as specified in its charter) (State or other ju ...