X0304 4 2011-09-30 0 0000016040 CABOT CORP CBT 0001189833 ENRIQUEZ CABOT JUAN C/O CABOT CORPORATION TWO SEAPORT LANE BOSTON MA 02210 1 0 0 0 Phantom Stock Units 2011-09-30 4 A 0 938.2567 24.78 A Common Stock 938.2567 15564.925 D 1 for 1 Immediately exercisable The shares of phantom stock become payable upon the reporting person's termination of service as a director. On July 7, 2011, Cabot's Board of Directors declared a dividend of $0.18 per share on Cabot common stock, payable on September 9, 2011 to all holders of record of common stock on August 29, 2011. Mr. Enriquez-Cabot received a dividend on his phantom stock units totalling $2,618.56, which was immediately reinvested in phantom stock units at a price of $33.11 per share. As a result, 79.0867 phantom stock units were allocated to Mr. Enriquez-Cabot on September 9, 2011. By: Karen Abrams, pursuant to a power of attorney from Juan Enriquez-Cabot 2011-10-04