Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On September 8, 2009, Cabot Corporation announced that William J. Brady, the then Executive Vice President and General Manager of the Corporation's Core Segment and Americas Region, would be leaving Cabot effective September 14, 2009.

In connection with his departure from Cabot, the Corporation and Mr. Brady entered into an agreement on October 6, 2009 under which Mr. Brady will receive payments totaling $795,000 payable over a two-year period and continued medical and dental coverage and other benefits having an aggregate cost of approximately $115,000. In addition, the Compensation Committee of Cabot's Board of Directors approved the acceleration of vesting of 27,000 shares of restricted stock granted to Mr. Brady in May 2007. These arrangements are subject to Mr. Brady's agreement regarding confidential information and proprietary developments and covenants as to non-competition and non-solicitation.

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