CoStar Group Inc. Common Stock. Replay the stock market charts of CSGP day by day back to 2003. Open long and short positions without spending any money. CoStar Group Inc provides commercial real estate data covering over 4 million properties from various subsectors from commercial areas. It operates five flagship brands: CoStar, LoopNet, Apartments.com, BizBuySell, and LandsofAmerica.
