Gevo, a company focused on using biocatalyts to make substitutes for petroleum-based specialty chemicals and fuels, raised $107 million by offering 7.15 million shares at $15, the high end of its proposed $13-$15 range. The Englewood, CO-based company, which is not expected to begin commercial scale production of its first targeted petroleum-derived chemical substitute until 2012, is backed by cleantech focused venture firm Khosla Ventures. Gevo will begin trading on Wednesday on the NASDAQ under the symbol GEVO. UBS Investment Bank, Piper Jaffray, and Citi acted as lead managers on the deal.