CABOT CORP — Director's Dealing 2012

Mar 20, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2012-03-19

Reporting Person: Keohane Sean D (Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-19	Common Stock	M	60000	$32.04	Acquired	77491	Direct
2012-03-19	Common Stock	S	60000	$43.25	Disposed	17491	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-19	Employee Stock Option (Right to Buy)	$32.04	M	60000	Disposed	2013-05-07	Common Stock (60000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	8568.6875	Indirect

Footnotes

F1: The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $42.85 to $43.56, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price.

F2: Reflects retirement plan contributions by the Corporation, including contributions that have occurred since the date of the reporting person's last ownership report.

F3: The option vested on May 8, 2011.