X0306 4 2016-09-30 0 0000016040 CABOT CORP CBT 0001201087 CORDEIRO EDUARDO E C/O CABOT CORPORATION TWO SEAPORT LANE, SUITE 1300 BOSTON MA 02210 0 1 0 0 Executive Vice President, CFO Phantom Stock 2016-09-30 4 A 0 282.5358 52.41 A Common Stock 282.5358 16666.2499 D 1 for 1 The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service in accordance with the provisions of the plan. By: Kristine L. Ouimet, pursuant to a power of attorney from Eduardo E. Cordeiro 2016-10-04