X0508 4 2026-01-26 0001374690 Larimar Therapeutics, Inc. LRMR 0001529611 BEN-MAIMON CAROLE C/O LARIMAR THERAPEUTICS, INC. THREE BALA PLAZA EAST, SUITE 506 BALA CYNWYD PA 19004 true true false false President and CEO false Common Stock 2026-01-26 4 A false 100100 0.00 A 368276 D Common Stock 31155 I By Trust Common Stock 31155 I By Trust Common Stock 31156 I By Trust Common Stock 31156 I By Trust Common Stock 31156 I By Trust Stock Option (Right to Buy) 3.60 2026-01-26 4 A false 600600 0.00 A 2036-01-26 Common Stock 600600 600600 D Each share is represented by a restricted stock unit ("RSU"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement. Represents shares held by the Irrevocable Deed of Trust of Carole S. Ben-Maimon for the Benefit of Meadow Lainey Ben-Maimon ("Meadow Trust"), of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of the shares held by the Meadow Trust except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed to be an admission that she has beneficial ownership of such shares for Section 16 or any other purpose. Represents shares held by the Irrevocable Deed of Trust of Carole S. Ben-Maimon for the Benefit of Olivia Liat Stein ("Olivia Trust"), of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of the shares held by the Olivia Trust except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed to be an admission that she has beneficial ownership of such shares for Section 16 or any other purpose. Represents shares held by the Irrevocable Deed of Trust of Carole S. Ben-Maimon for the Benefit of Ella Bar Stein ("Ella Trust"), of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of the shares held by the Ella Trust except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed to be an admission that she has beneficial ownership of such shares for Section 16 or any other purpose. Represents shares held by the Irrevocable Deed of Trust of Carole S. Ben-Maimon for the Benefit of Romi Aleeza Stein ("Romi Trust"), of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of the shares held by the Romi Trust except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed to be an admission that she has beneficial ownership of such shares for Section 16 or any other purpose. Represents shares held by the Irrevocable Deed of Trust of Carole S. Ben-Maimon for the Benefit of Matzi Mark Ben-Maimon ("Matzi Trust"), of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of the shares held by the Matzi Trust except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed to be an admission that she has beneficial ownership of such shares for Section 16 or any other purpose. The option vests 25% on January 26, 2027, with the remaining 75% vesting in equal monthly installments on the last day of each of the 36 calendar months immediately following such date, subject to the Reporting Person's continued service with the Issuer through the applicable vesting date. /s/ Jennifer Johansson, Attorney-in-fact 2026-01-27