X0508 4 2023-10-03 0001374690 Larimar Therapeutics, Inc. LRMR 0001230482 SHERMAN JEFFREY W 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) 3.555 2023-10-03 4 A 0 16600 0 A 2033-10-03 Common Stock 16600 16600 D The option vests in equal monthly installments over 36 months commencing on November 3, 2023, subject to the Reporting Person's continued service on the Board of Directors of the Company through each applicable vesting date. /s/ Jennifer Johansson, Attorney-in-fact 2023-10-05