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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
1456336	Gregory Stea	65 Hayden Avenue Lexington MA 02421	Svp, Commercial Operations	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	2012-05-13	1,800	$0.00	7,509	No	4	M	Direct
Common Stock	Disposition	2012-05-14	584	$41.55	6,925	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	Restricted Stock Units	Disposition	2012-05-13	1,800	$0.00	1,800	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
5,400	2012-05-13		No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,553	Indirect	401(k) Plan

Footnotes

Sold pursuant to a Rule 10(b)5-1 Plan.
Shares were sold to cover tax obligations incurred in connection with the vesting of Restricted Stock Units.
This transaction was executed in multiple trades at prices ranging from $41.55 to $41.56. The price reported in the table 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.
Each restricted stock unit represents a contingent right to receive one share of Cubist common stock.
The restricted stock units vest 25% annually over a four-year period, with the first 25% vesting one year after the grant date. The restricted stock units do not expire.