CABOT CORP — Director's Dealing 2007

Aug 7, 2007

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2007-08-03

Reporting Person: BERUBE BRIAN A (Vice President,General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2007-08-03	Common Stock	A	17500	$13.80	Acquired	60972	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5572.8878	Indirect

Footnotes

F1: Represents acquisition of shares of restricted stock awarded under Cabot's 2007 long-term incentive program. Under the terms of the award, the per share purchase price is 30% of the closing market price of Cabot common stock on May 10, 2007 ($13.80), the date the award was approved by the Compensation Committee of Cabot's Board of Directors. Mr. Berube was required to pay the purchase price for the shares by August 6, 2007. Mr. Berube paid the purchase price on August 3, 2007.

F2: Prior to July 20, 2007, retirement plan contributions made by the Company under the Employee Stock Ownership Plan portion of Cabot's Retirement Savings Plan were made with shares of Series B ESOP Convertible Preferred Stock. Each share of this preferred stock was convertible into 146.3782 shares of Cabot's common stock. On July 20, 2007, all of the preferred stock held by the Trustee of the Retirement Savings Plan was converted to common stock. The amount reported here includes amounts that previously would have been reported under Table II as Series B ESOP Convertible Preferred Stock as well as retirement plan contributions made by the Company under the 401(k) portion of the Retirement Savings Plan.