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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
1435737	D Sean Keohane	C/O Cabot Corporation Two Seaport Lane Boston MA 02210	Senior Vice President	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	Explanation
Common Stock	Acquisiton	2013-12-05	25,000	$16.90	57,924	No	4	M	Direct
Common Stock	Disposition	2013-12-05	25,000	$48.74	32,924	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	2013-12-05	25,000	$0.00	25,000	$16.90

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2019-05-06	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	10,604	Indirect	Through the Trustees for the Corporation's Retirement Savings Plan

Footnotes

The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $48.65 to $48.84, 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.
Reflects retirement plan contributions by the Corporation, including contributions that have occurred since the date of the reporting person's last ownership report.
50,000 shares are subject to the option. The option vested over a three year period as follows: 30% on May 7, 2010, 30% on May 7, 2011 and 40% on May 7, 2012.