Iberia Capital Upgrades CARBO Ceramics To Sector Perform By: Benzinga via Benzinga June 17, 2015 at 09:16 AM EDT Iberia Capital upgraded CARBO Ceramics Inc. (NYSE: CRR) from Underperform to Sector Perform. CARBO Ceramics shares have dropped 67.49 ... Read More >> Related Stocks: Carbo Ceramics