X0304 4 2011-12-31 0 0000016040 CABOT CORP CBT 0001214937 MCCANCE HENRY F C/O CABOT CORPORATION TWO SEAPORT LANE BOSTON MA 02210 1 0 0 0 Phantom Stock 2011-12-31 4 A 0 692.2838 32.14 A Common Stock 692.2838 14247.2601 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 November 11, 2011, Cabot's Board of Directors declared a dividend of $0.18 per share on Cabot common stock, payable on December 9, 2011 to all holders of record of common stock on November 25, 2011. Mr. McCance received a dividend on his phantom stock units totalling $2,426.84, which was immediately reinvested in phantom stock units at a price of $33.45 per share, the closing price on December 9, 2011. As a result, 72.5513 phantom stock units were allocated to Mr. McCance on December 9, 2011. By: Karen Abrams, pursuant to a power of attorney from Henry F. McCance 2012-01-03