Kopin Corporation - Manufactures and sells custom wafer-engineered materials, and develops miniature electronic imaging devices and advanced display products. (Nasdaq: KOPN). - http://www.kopin.com/
Ibis Technology Corporation - Manufactures and markets silicon-on-insulator wafers which are used in the production of integrated circuits in the semiconductor industry. (Nasdaq: IBIS). - http://www.ibis.com/
Si-Mat - Manufacturer of 1" to 300mm silicon and 3" to 200mm silicon on insulator (SOI) wafers, located in Germany. - http://www.si-mat.com/