X0306 4 2013-09-23 0 0000016040 CABOT CORP CBT 0001243739 BERUBE BRIAN A C/O CABOT CORPORATION TWO SEAPORT LANE BOSTON MA 02210 0 1 0 0 SVP, General Counsel Common Stock 2013-09-23 4 M 0 18000 16.90 A 55687 D Common Stock 2013-09-23 4 S 0 18000 42.0476 D 37687 D Common Stock 2013-09-23 4 S 0 5000 42.1416 D 32687 D Common Stock 13854.7015 I Through the Trustees for the Corporation's Retirement Savings Plan Employee Stock Option (Right to Buy) 16.90 2013-09-23 4 M 0 18000 0.00 D 2013-05-06 Common Stock 18000 0 D The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $41.90 to $42.40, 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 $42.00 to $42.35, 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. 45,000 shares are subject to the option. 13,500 shares vested on May 7, 2010, 13,500 shares vested on May 7, 2011 and 18,000 shares vested on May 7, 2012. By: Karen Abrams, pursuant to a power of attorney from Brian A. Berube 2013-09-24