PTT Chemical owns 47.9% of Myriant after it invested $60m in January.
Myriant, a US-based developer of bio-chemicals, plans to raise $125m in its Nasdaq flotation.
PTT Chemical, which was formed out of the merger of National Petrochemical and Thai Olefins in 2005, owns 47.9% of Myriant after investing $60m in January at $5.35 per A share.
Investment bank UBS is lead underwriter for Myriant, which posted a $16m net loss last year on about $14m of revenues.
http://www.sec.gov/Archives/edgar/data/1485026/000095012311054952/b86680sv1.htm