UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q For the quarter ended September 30, 2025 (MARK ONE) ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-41062 MOUNTAIN CREST ACQUISITION CORP. V (Exact Name of Registrant as Specified in Its Charter) (State or other jurisdiction of incorporation or organization) Delaware 86-1768041 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 1 ...