Myriant Announces Executive Leadership Changes

Quincy, MA (August 27, 2021) The Board of Directors of Myriant Corporation ("Myriant"), an affiliate of PTT Global Chemical Public Company Limited ("PTTGC"), has announced that Cenan Ozmeral, Ph.D. will retire as Myriant's President and Chief Executive Officer. Dr. Ozmeral will continue to serve as a Special Advisor to the Board and management providing his insights and industry expertise. Dennis McCullough, Ph.D., currently Vice President, International Business Operations at PTTGC has been appointed Myriant's President and Chief Executive Officer and will immediately assume leadership and continue operations at Myriant.

Cenan Ozmeral, Ph.D., commented "After 35 years in the chemical industry and 7 years with Myriant, I have decided to retire from my roles at Myriant. Serving as President and CEO of Myriant Corporation has been a rewarding endeavor as we have continued our transformation to a fully-integrated commercial operation. I have great confidence that Dennis and the Myriant team will continue to move the company forward on its path to successful commercialization and global expansion."

Dr. McCullough joins Myriant following his 25 year career as a senior executive with an extensive background in the chemical, plastics and polymer industries. Most recently at PTTGC, Dr. McCullough served as Vice President, International Business Operations. Prior to this, Dr. McCullough has held a variety of executive positions during his 23 year career at Bayer and Bayer Material Science, and he also has served as Vice President, South East Asia at Synthomer. Dr. McCullough earned an MBA from The Eli Broad Graduate School of Management at Michigan State University, and a Ph.D. and a B.S. in chemistry from the University of Pittsburgh.

"This is a tremendous time and opportunity to lead Myriant, particularly as the organization continues to evolve its global operations," said Dr. McCullough. I look forward to working with the Myriant team and continuing the strong PTTGC commitment to advancing our U.S. and global expansion for bio-succinic acid and its derivatives."

Mr. Anon Sirisaengtaksin, Chairman of the Board of Directors for Myriant commented, "On behalf of the Myriant Board of Directors, I'd like to thank Cenan for his leadership and valuable contributions. Under his direction and with a talented management team, Cenan has positioned Myriant as a leader in the burgeoning bio-based chemicals industry. We are also very pleased that Dr. McCullough has accepted the position of President and CEO of Myriant. Dennis's international executive experience in the chemical, plastics and polymer industries will serve Myriant well as the Company continues its global commercial operations."

About Myriant Corporation
Myriant is a global leader innovating and commercializing bio-based chemical intermediates. Myriant enables its customers to achieve their sustainability initiatives by utilizing renewable feedstocks to produce high-value, cost-advantaged chemicals, including bio-succinic acid and its derivatives. Myriant is currently commercializing its bio-succinic acid platform from Myriant's flagship plant in Lake Providence, LA.

Myriant Corporation, 3 Batterymarch Park, Quincy, MA 02169-7541
Heidi Inglis, Tel. +1 617-657-5200