Mascoma's largest corporate shareholders are SunOpta, Valero and General Motors.

Mascoma, a US-based developer of a platform to convert renewable feedstocks into chemicals used in alternative fuels, plans to raise up to $100m in its flotation on an undisclosed stock exchange.

The company’s largest shareholder is Canada-based organic foods and nutrients supplier SunOpta, which sold its biofuels division, SunOpta BioProcess, to Mascoma in September last year. The sale followed SunOpta investing nearly $25m in Mascoma at series D round in August 2010.

Oil major Valero also invested $5m for 1.3…