X0306 4 2021-05-06 0 0000016040 CABOT CORP CBT 0001800538 Dumont Lisa M C/O CABOT CORPORATION TWO SEAPORT LANE, SUITE 1400 BOSTON MA 02210 0 1 0 0 Vice President and Controller Common Stock 2021-05-06 4 S 0 1390 62.35 D 5088 D Common Stock 1439.99 I Through the Trustee for the Corporation's 401(k) Plan The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.35 to $62.37, 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. By: Jennifer Lombardi, pursuant to a power of attorney from Lisa M. Dumont 2021-05-07