On April 5, 2013, Mark L. Edmunds, Vice President of Operations of CARBO Ceramics Inc. informed the company that he has decided to retire. Mr. Edmunds will cease to serve as an officer of the company effective May 1, 2013. Mr. Edmunds plans to continue his employment with the company through June 28, 2013 in order to assist with the transition of his responsibilities.

The company also announced that Roger L. Riffey has been elected as the Vice President of Manufacturing of the company effective May 1, 2013, and will assume Mr. Edmunds' duties as of such date. Since July 2010, Mr. Riffey has served as the Plant Manager for the company's manufacturing facility in Toomsboro, Georgia. He also served as the company's Supply Chain and Customer Service Manager from July 2006 to July 2010.