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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
1671755	Hobart Kalkstein	C/O Cabot Corporation Two Seaport Lane, Suite 1300 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	2017-09-14	3,881	$16.90	27,736	No	4	M	Direct
Common Stock	Disposition	2017-09-14	3,881	$53.39	23,855	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 to Buy)	Disposition	2017-09-14	3,881	$0.00	3,881	$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	6,003	Indirect	Through the Trustee for the Corporation's 401(k) plan

Footnotes

The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $53.35 to $53.42, 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.
16,300 shares were 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.