UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 __________________________ FORM 10-K __________________________ x 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 o 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: 001-40551 __________________________ Acumen Pharmaceuticals, Inc. (Exact name of registrant ...