UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 10-Q ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITY AND EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITY AND EXCHANGE ACT OF 1934 Commission file number 000-13292 McGRATH RENTCORP (Exact name of registrant as specified in its Charter) California 94-2579843 (State or other jurisdiction (I.R.S. Employer of incorporation or organ ...