X0306 5 2018-12-31 0 1 0001705843 Calyxt, Inc. CLXT 0001753563 Blome James 2800 MOUNT RIDGE ROAD ROSEVILLE MN 55113 1 Chief Executive Officer Restricted Stock Units 2018-10-01 4 F 0 L 15536 14.83 D 164464 D The award of restricted stock units with respect to Calyxt, Inc. common stock was granted on September 17, 2018 and vested 25% on October 1, 2018, with 15% vesting on October 1, 2019, and the remainder vesting quarterly (commencing with the fourth fiscal quarter of 2019) in equal installments over 36 months. /s/ Dr. Andre Choulika, Ph.D., attorney-in-fact for Mr. Blome 2019-02-14