September 26, 2019 Calyxt® Provides Business and R&D Pipeline Update at Wells Fargo Consumer Conference Innovation Platform Focused on Wellness, Plant-Based Proteins and Sustainability Six New Products in R&D Pipeline Exploratory R&D in Canola, Hemp, Oat, Pea, Peanut, Potato, Soybean, and Wheat Webcast Details for Wells Fargo Consumer Conference Presentation ROSEVILLE, Minn.–(BUSINESS WIRE)—September 26, 2019—Calyxt, Inc. (NASDAQ: CLXT), a healthy food innovation company, today provided a business update, announced its expanded R&D pipeline, and discussed R&D exploration activities. Calyxt announced six new product candidates at the discovery stage in its R&D pipeline. Four new soybean product candidates comprised of two wellness products, one plant-based protein product, and one sustainability product. Of the two new wheat product candidates, one is a wellness product and one is a sustainability product. Calyxt also shared exciting innovation leads across its platform with exploratory R&D focused in canola, hemp, oat, pea, peanut, potato, soybean, and wheat. “Executing on our trailblazing 2019 milestones has resulted in an expanded patent estate, regulatory success, an established identity-preserved supply chain system, market development and customer acquisition, which creates a solid foundation for future growth,” said Jim Blome, chief executive officer with Calyxt. “In the past year we have filled out our leadership team and added several other key roles, which will help us capitalize on our head start. We are excited about our innovation platform, R&D pipeline, exploratory opportunities and the future ahead,” Blome said. 2019 Wells Fargo Consumer Conference – Webcast Details Calyxt will present at the 2019 Wells Fargo Consumer Conference at the Ritz-Carlton Laguna Niguel on September 26, 2019, at 10:20 am PT. Please use this link to view both the live webcast and replay version of the webcast. A copy of the investor presentation has been posted on the Calyxt website in the Corporate Presentations section at https://calyxt.com/investors/. About Calyxt Calyxt is committed to making the food you love a healthier choice. The care we take extends beyond nutritional value. We partner with farmers and food companies to deliver traceable plant-based products developed to be healthier and more sustainable than their conventional counterparts. We use cutting edge plant breeding techniques to develop products that help improve diets by reducing bad fats, allergens and toxins. Today oil from our high oleic soybean plants has lower saturated fats than commodity soybean oil. We are also developing high fiber wheat designed to provide an excellent source of daily fiber when incorporated into wheat-based foods. We continuously pursue innovation to deliver good food that is good for you. Calyxt®, Calyno® and the corporate logo are trademarks owned by Calyxt, Inc. Calyxt is located in Roseville, MN, and is listed on the Nasdaq market (ticker: CLXT). For further information please visit our website at www.calyxt.com. Media contact: Trina Lundblad, Communications Director Phone: +1 612-790-0514 Email: firstname.lastname@example.org Investor Relations contact: Simon Harnest, VP Corporate Strategy and Finance Phone: +1 646-385-9008 Email: email@example.com Calyxt Forward-Looking Statements This communication contains “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. In some cases, you can identify these statements by forward-looking words such as “may,” “might,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential” or “continue,” the negative of these terms and other comparable terminology. These forward-looking statements, which are subject to risks, uncertainties and assumptions about us, may include projections of our future financial performance, our anticipated growth strategies and anticipated trends in our business. These statements are only predictions based on our current expectations and projections about future events. There are important factors that could cause our actual results, level of activity, performance or achievements to differ materially from the results, level of activity, performance or achievements expressed or implied by the forward-looking statements, including those factors discussed under the caption entitled “Risk Factors” in our Annual Report on Form 10-K, along with our other filings with the U.S. Securities and Exchange Commission. We do not assume any obligation to publicly provide revisions or updates to any forward-looking statements, whether as a result of new information, future developments or otherwise, should circumstances change, except as otherwise required by applicable laws.