CABOT CORP — Director's Dealing 2012

Mar 14, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2012-03-12

Reporting Person: Prevost Patrick M. (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-12	Common Stock	M	30000	$16.90	Acquired	251166	Direct
2012-03-12	Common Stock	S	30000	$42.04	Disposed	221166	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-12	Employee Stock Option (Right to Buy)	$16.90	M	30000	Disposed	2019-05-06	Common Stock (30000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5425.4683	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.

F2: 300,000 shares are subject to the option. 90,000 shares vested on May 7, 2010, 90,000 shares vested on May 7, 2011 and 120,000 shares will vest on May 7, 2012.