X0508 4 2025-05-13 0001374690 Larimar Therapeutics, Inc. LRMR 0001242616 THOMAS FRANK E C/O LARIMAR THERAPEUTICS, INC. THREE BALA PLAZA EAST, SUITE 506 BALA CYNWYD PA 19004 1 0 0 0 0 Stock Option (Right to Buy) 1.875 2025-05-13 4 A 0 19000 0 A 2035-05-13 Common Stock 19000 19000 D The options vest on the earlier of (a) May 13, 2026 or (b) the date of the Company's next annual meeting of stockholders, in each case subject to the Reporting Person's continued service on the Board of Directors of the Company. /s/ Jennifer Johansson, Attorney-in-fact 2025-05-14