UNITED STATES SECURITIES AND EXCHANGE C OMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For transition period from to Commission File Number: 001-40136 Amalgamated Financial Corp. (Exact name of registrant as specified in its charter) Delaware 85-2757101 (State or other jurisdiction of incor ...