X0306 4 2022-03-24 0 0001705843 Calyxt, Inc. CLXT 0001763989 Koschak William 2800 MOUNT RIDGE ROAD ROSEVILLE MN 55113 0 1 0 0 Chief Financial Officer Common Stock 2022-03-24 4 A 0 100000 0 A 135395 D Common Stock 2022-03-24 4 A 0 119700 0 A 255095 D Stock Option (Right-to-Buy) 1.27 2022-03-24 4 A 0 250000 0 A 2023-03-24 2032-03-24 Common Stock 250000 250000 D The Restricted Stock Units reported on this Form 4 vest as to 1/3 of the shares on each of the first three anniversaries of the date of the grant. The Restricted Stock Units reported on this Form 4 vest in full on January 1, 2023. Option vests as to 25% on each of the first four anniversaries of the date of the grant. Debra Frimerman, Attorney-in-Fact for William Koschak 2022-03-28