UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 For the fiscal year ended December 31, 2025 OR ☐ 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 001-42620 BERTO ACQUISITION CORP. (Exact name of registrant as specified in its charter) Cayman Islands 99-4250815 (State or other jurisdiction of incorporation or organization) FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 1 ...