Greenlight Capital is a hedge fund founded in 1996 by David Einhorn, headquartered in New York City. The firm is recognized for its value-oriented investment strategy, often taking both long and short positions in public equities. Greenlight has gained attention for high-profile short bets, including against Lehman Brothers before its collapse in 2008. The fund manages capital for institutional investors and high-net-worth individuals, focusing on fundamental research and contrarian market views.