UNITED STATES SECURITIES AND EXCHANGE COMMISSION 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 Commission file number 001-37581 ACLARIS THERAPEUTICS, INC. Incorporated under the Laws of the I.R.S. Employer Identification No. State of Delaware 46-0571712 701 Lee Road, Suite 103 Wayne, PA 19087 (484) 324-7933 Securities registered pursuant to Section 12(b) of the Act: Title of Each Class: Tradin ...