RealD Inc. is a privately held company known for its RealD 3D system, which is used for projecting films in stereoscopic 3D using circularly polarized light. The company was founded in 2003 by Michael V. Lewis and Joshua Greer. The company was made public on the New York Stock Exchange (NYSE) in July 2010, trading under the ticker RLD. It was re-privatized in 2016 by the private equity firm Rizvi Traverse. Between 2005 and 2007, the company purchased StereoGraphics Inc. and optical components technology company ColorLink, a provider of rear-projection television (RPTV) equipment, polarizing film and optical technologies. RealD developed its technology to create its 3D cinema systems.