X0609 4 2026-06-04 0001557746 Aclaris Therapeutics, Inc. ACRS 0001187159 MILANO VINCENT false C/O ACLARIS THERAPEUTICS, INC. 701 LEE ROAD, SUITE 103 WAYNE PA 19087 true false false false 0 Common Stock 2026-06-05 4 M 0 11580 A 28896 D Stock Option (Right to Buy) 4.71 2026-06-04 4 A 0 42350 0 A 2036-06-03 Common Stock 42350 42350 D Restricted Stock Units 2026-06-04 4 A 0 10987 0 A Common Stock 10987 10987 D Restricted Stock Units 2026-06-05 4 M 0 11580 0 D Common Stock 11580 0 D Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer. The shares subject to this stock option will vest in twelve equal monthly installments commencing on July 4, 2026, subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2025 Equity Incentive Plan, or the Plan) through each such vesting date. This grant was made pursuant to the issuer's tenth amended and restated non-employee director compensation policy. The shares underlying these restricted stock units will vest in one installment on June 4, 2027, subject to the Reporting Person's Continuous Service (as defined in the Plan) as of such date. The shares underlying these restricted stock units vested on June 5, 2026. /s/ Matthew Rothman, Attorney-in-Fact 2026-06-08