CABOT CORP — Director's Dealing 2012

Dec 20, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2012-12-18

Reporting Person: BERUBE BRIAN A (SVP, General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-18	Common Stock	M	13500	$16.90	Acquired	56187	Direct
2012-12-18	Common Stock	M	15120	$23.15	Acquired	71307	Direct
2012-12-18	Common Stock	S	28620	$40.00	Disposed	42687	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-18	Employee Stock Option (Right to Buy)	$16.90	M	13500	Disposed	2019-05-06	Common Stock (13500)	Direct
2012-12-18	Employee Stock Option (Right to Buy)	$23.15	M	15120	Disposed	2019-11-12	Common Stock (15120)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	13043.5877	Indirect

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 21, 2012.

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: 45,000 shares are subject to the option. 13,500 shares vested on May 7, 2010, 13,500 shares vested on May 7, 2011 and 18,000 shares vested on May 7, 2012.

F4: 25,200 shares are subject to the option. 7,560 shares vested on November 13, 2010, 7,560 shares vested on November 13, 2011 and 10,080 shares vested on November 13, 2012.