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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
16040	Cabot Corp	CBT	Miscellaneous Chemical Products (2890)	042271897

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1243739	A Brian Berube	C/O Cabot Corporation Two Seaport Lane Boston MA 02210	Svp, General Counsel	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2012-12-18	13,500	$16.90	56,187	No	4	M	Direct
Common Stock	Acquisiton	2012-12-18	15,120	$23.15	71,307	No	4	M	Direct
Common Stock	Disposition	2012-12-18	28,620	$40.00	42,687	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2012-12-18	13,500	$0.00	13,500	$16.90
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2012-12-18	15,120	$0.00	15,120	$23.15

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
18,000		2019-05-06	No	4	M	Direct
10,080		2019-11-12	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	13,044	Indirect	Through the Trustees for the Corporation's Retirement Savings Plan

Footnotes

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