CABOT CORP — Director's Dealing 2009

Apr 2, 2009

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2009-03-31

Reporting Person: CLARKESON JOHN S (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2009-03-31	Phantom Stock Units	$	A	1308.2778	Acquired		Common Stock (1308.2778)	Direct

Footnotes

F1: 1 for 1

F2: Immediately exercisable

F3: The shares of phantom stock become payable upon the reporting person's termination of service as a director.

F4: On January 9, 2009, Cabot's Board of Directors declared a dividend of $0.18 per share on Cabot common stock, payable on March 13, 2009 to all holders of record of common stock on February 27, 2009. Mr. Clarkeson received a dividend on his phantom stock units totalling $2,574.76, which was immediately reinvested in phantom stock units at a price of $9.24 per share. As a result, 278.6537 phantom stock units were allocated to Mr. Clarkeson on March 13, 2009.