CABOT CORP — Director's Dealing 2009

Feb 17, 2009

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2009-02-13

Reporting Person: Mason Jonathan P (Executive Vice President, CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2009-02-13	Common Stock	D	22500	$10.57	Disposed	64134	Direct
2009-02-13	Common Stock	D	23800	$12.87	Disposed	40334	Direct
2009-02-13	Common Stock	D	37000	$9.61	Disposed	3334	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2920	Indirect

Footnotes

F1: Reflects retirement plan contributions by the Corporation, including contributions that have occurred since the date of the reporting person's last ownership report. In connection with his resignation from the Corporation on February 13, 2009, Mr. Mason will forfeit his unvested account balance of 1,752 shares.