X0508 4 2023-12-07 0001374690 Larimar Therapeutics, Inc. LRMR 0001965014 Shankar Gopi C/O LARIMAR THERAPEUTICS, INC. THREE BALA PLAZA EAST, SUITE 506 BALA CYNWYD PA 19004 0 1 0 0 Chief Development Officer 0 Common Stock 2023-12-07 4 P 0 5000 3.7323 A 5000 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.73 to $3.768, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth herein. /s/ Jennifer Johansson, Attorney-in-fact 2023-12-08