According to industry sources, the combined global market for conventional four-carbon (“C4”) and three-carbon (“C3”) industrial chemicals is estimated at more than $10 billion annually. C4 chemicals are used in applications ranging from high-performance engineering plastics to spandex. C3 chemicals have applications in paints, coatings, diapers and adhesives.About Metabolix Metabolix, Inc. is an innovation-driven bioscience company delivering sustainable solutions to the plastics, chemicals and energy industries. Metabolix is developing and commercializing Mirel TM and Mvera TM, a family of high-performance bioplastics which are biobased and biodegradable alternatives to many petroleum-based plastics. Metabolix’s biobased chemicals platform utilizes its novel “FAST” recovery process to enable the production of cost-effective, “drop-in” replacements for petroleum-based industrial chemicals. Metabolix is also developing a platform for co-producing plastics, chemicals and energy from crops. Metabolix has established an industry-leading intellectual property portfolio that, together with its knowledge of advanced industrial practice, provides a foundation for industry collaborations. For more information, please visit www.metabolix.com. (MBLX-G) Safe Harbor for Forward-Looking Statements This press release contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The forward-looking statements in this release do not constitute guarantees of future performance. Investors are cautioned that statements in this press release which are not strictly historical statements, including, without limitation, statements regarding the ability to develop, commercialize and market biobased industrial chemicals, constitute forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated and are detailed in Metabolix's filings with the Securities and Exchange Commission, including its 10-K for the year ended December 31, 2011, which was filed on March 12, 2012. Metabolix assumes no obligation to update any forward-looking information contained in this press release or with respect to the announcements described herein.