X0306 4 2018-12-31 0 0000016040 CABOT CORP CBT 0001740348 McLaughlin Erica C/O CABOT CORPORATION TWO SEAPORT LANE, SUITE 1300 BOSTON MA 02210 0 1 0 0 Senior Vice President, CFO Phantom Stock Units 2018-12-31 4 A 0 820.9325 42.94 A Common Stock 820.9325 1645.7774 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 Erica McLaughlin 2019-01-03