Bolt Threads

Based in Berkeley, California, Bolt Threads is a materials innovation company that develops biofabricated silk fibers and sustainable biomaterials for the global apparel, footwear, and beauty industries. The enterprise manufactures proprietary synthetic products, such as b-silk protein and xl-silk polypeptide, which are designed to help consumer brands reduce their environmental impact and reliance on traditional agricultural and petrochemical resources. Operating with a dedicated workforce of 50 employees, the business has secured $213 million in total venture funding and projects $34.2 million in annual revenue for the 2025 fiscal year. The organization supplies its alternative materials to prominent corporate customers including adidas, Stella McCartney, and Vegamour, while maintaining a board of directors that features industry veterans Jerry Fiddler and Jeri Finard. Bolt Threads was officially founded in 2009 by scientific researchers Dan Widmaier and David Breslauer.