X0306 4 2017-02-06 0 0000016040 CABOT CORP CBT 0001243739 BERUBE BRIAN A C/O CABOT CORPORATION TWO SEAPORT LANE, SUITE 1300 BOSTON MA 02210 0 1 0 0 SVP, General Counsel Common Stock 2017-02-06 4 M 0 19662 35.25 A 66735 D Common Stock 2017-02-06 4 S 0 19662 57.57 D 47073 D Common Stock 2017-02-06 4 M 0 19553 32.95 A 66626 D Common Stock 2017-02-06 4 S 0 19553 57.55 D 47073 D Common Stock 8400.04 I Through the Trustee for the Corporation's 401(k) plan Employee Stock Option (Right to Buy) 35.25 2017-02-06 4 M 0 19662 0.00 D 2022-11-08 Common Stock 19662 0 D Employee Stock Option (Right to Buy) 32.95 2017-02-06 4 M 0 19553 0.00 D 2021-11-10 Common Stock 19553 0 D The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $57.30 to $58.095, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $57.33 to $57.810, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price. Reflects retirement plan contributions by the Corporation, including contributions that have occurred since the date of the reporting person's last ownership report. 19,662 shares were subject to the option. The option vested over a three year period as follows: 30% on November 9, 2013, 30% on November 9, 2014 and 40% on November 9, 2015. 19,553 shares were subject to the option. The option vested over a three year period as follows: 30% on November 11, 2012, 30% on November 11, 2013 and 40% on November 11, 2014. By: Kristine L. Ouimet, pursuant to a power of attorney from Brian A. Berube 2017-02-08