High Quality Content by WIKIPEDIA articles! Rowan Companies, Inc. (NYSE: RDC), founded in 1923 and based in Houston, Texas, is an S&P 500 company which provides contract oil well drilling services and rigs, and manufactures equipment for drilling as well as for mining and timber industries. Rowan Companies is located at 2800 Post Oak Boulevard, Suite 5450, in Houston, Texas. W. Matt Ralls is President, and Chief Executive Officer.