Rubicon Tech Files for IPO

Rubicon Technology Inc., a Franklin Park, Ill.-based maker of monocrystalline sapphire and other crystalline products, has filed for a $100 million IPO. It plans to trade on the Nasdaq under ticker symbol RBCN, with UBS serving as lead underwriter. Rubicon has raised nearly $44 million in VC funding since 2001, from firms like Cross Atlantic Capital Partners, Gazelle TechVentures, KB Partners and River Cities Capital Funds.