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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
912183	Cubist Pharmaceuticals Inc	CBST	Pharmaceutical Preparations (2834)	223192085

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1433991	L Tamara Joseph	65 Hayden Avenue Lexington MA 02421	Svp, Gc & Secretary	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	2012-06-06	20,000	$19.16	39,059	No	4	M	Direct
Common Stock	Disposition	2012-06-06	20,000	$41.16	19,059	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	Stock Options (Right to Buy)	Disposition	2012-06-06	20,000	$0.00	20,000	$19.16

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
80,000	2008-08-15	2018-05-15	No	4	M	Direct

Footnotes

Sold pursuant to a Rule 10(b)5-1 Plan.
This transaction was executed in multiple trades at prices ranging from $41.16 to $41.18. The price reported in the trade reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which each transaction was effected.
Option vests 6.25% quarterly over a four-year period.