Myriant Achieves Major Milestone: Successful Start-Up At Flagship Bio-Succinic Acid Plant in Lake Providence, LA

Quincy, MA – June 17, 2013 –Myriant Corporation, a global renewable chemicals company, announced today the successful start-up at its flagship bio-succinic acid plant located in Lake Providence, Louisiana. Myriant has produced on-spec commercial product at the plant and the Company anticipates that customer shipments will commence soon. Myriant's bio-succinic acid plant is the first of its kind and scale in North America and has an annual nameplate production capacity of 30 million pounds of bio-succinic acid.

"This is an exciting and challenging time for Myriant as we work through typical start-up and optimization activities to produce our high-performing bio-succinic acid at Lake Providence," said Stephen J. Gatto, Chairman and Chief Executive Officer for Myriant. "Given the positive metrics we've achieved to date at Lake Providence and most recently at ThyssenKrupp Uhde's commercial validation plant in Leuna, Germany, and, combined with our team's depth of expertise in building and operating fermentation plants, we expect a relatively smooth transition to steady-state operations. As is always the case when bringing chemical plants online, it will take some time to achieve our full production rate, but we are confident about the reliability of our core technology platform. We look forward to shipping bio-succinic acid to our growing list of customers, distributors and partners across the globe who seek to integrate our cost-advantaged renewable succinic acid into their manufacturing processes."

Myriant's Lake Providence Commercial Facility is partially funded through a $50 million cost sharing cooperative agreement received from the United States Department of Energy (DOE), $25 million from the United States Department of Agriculture (USDA) Rural Development B&I Loan Guarantee Program and a $10 million grant from the Lake Providence Port Commission and the Louisiana Department of Transportation. Heartland Bank is recognized by the USDA as the Lender of Record for the B&I Loan Guarantee.

Globally, the annual worldwide market for succinic acid is estimated at approximately $7.5 billion in new and existing applications. Succinic acid, which is traditionally produced from petroleum, can be used in a wide variety of applications including polymers, urethanes, plasticizers and coatings. Myriant's high purity bio-succinic acid is made from renewable feedstocks and is chemically equivalent to petroleum-based succinic acid while providing a lower environmental footprint. Myriant's bio-succinic acid reduces harmful green house gas emissions by 94% compared to petroleum-derived succinic acid and by 93% compared to petroleum-derived adipic acid, a chemical that succinic acid can replace.

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 two operating chemical plants: The first is Myriant's flagship plant in Lake Providence, LA; the other, a commercial validation facility located in Leuna, Germany, which is operated by Myriant's global partner, ThyssenKrupp Uhde. Myriant, together with Johnson Matthey - Davy Technologies (JM Davy), combined the efficiencies of their respective chemical processes for the production of cost-competitive bio-BDO and bio-THF made from Myriant's bio-succinic acid, yielding overall carbon efficiency of 87%. Myriant is also advancing its proprietary, low-cost, high-purity process for bio-acrylic acid. Myriant commercialized D(-) lactic acid in 2008 for the production of polylactic acid (PLA), which is used to make biodegradable plastic. More information about Myriant's pipeline of renewable chemicals can be found at www.myriant.com. Myriant is a 2013 Red Herring Top 100 Company in North America.

Contact:

Sue Hager SVP, Corporate Communications and Government Affairs
Myriant Corporation
shager@myriant.com
617-657-5222