X0306 4 2019-07-01 0 0001705843 Calyxt, Inc. CLXT 0001712226 Sahoo Manoj 2800 MOUNT RIDGE ROAD ROSEVILLE MN 55113 0 1 0 0 Chief Commercial Officer Common Stock 2019-07-01 4 S 0 1494 12.6955 D 65323 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 6, 2019. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $12.58 to $12.80, inclusive. The reporting person undertakes to provide Calyxt, Inc., any security holder of Calyxt, Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4. Dr. Andre Choulika, Attorney-in-Fact for Manoj Sahoo 2019-07-02