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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
1263230	J Robert Perez	65 Hayden Avenue Lexington MA 02421	President & Coo	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	2013-02-16	5,000	$0.00	32,208	No	4	M	Direct
Common Stock	Disposition	2013-02-19	2,177	$41.40	30,031	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	Performance Restricted Stock Units	Acquisiton	2013-02-15	10,216	$0.00	10,216	$0.00
Common Stock	Stock Options (Right to Buy)	Acquisiton	2013-02-15	62,575	$0.00	62,575	$41.60
Common Stock	Restricted Stock Units	Acquisiton	2013-02-15	10,216	$0.00	10,216	$0.00
Common Stock	Restricted Stock Units	Disposition	2013-02-16	5,000	$0.00	5,000	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,216	2016-02-15		No	4	A	Direct
62,575	2013-05-15	2023-02-15	No	4	A	Direct
10,216	2014-02-15		No	4	A	Direct
15,000	2013-02-16		No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,892	Indirect	401(k) Plan

Footnotes

Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units.
This transaction was executed in multiple trades at prices ranging from $41.4000 to $41.4050. 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 the transaction was effected.
Each restricted stock unit represents a contingent right to receive one share of Cubist common stock for no consideration.
Shares are earned based on the achievement of certain performance conditions, which are set forth in the applicable performance unit agreement. Any earned shares are delivered to the reporting person on the third anniversary of the grant date. The restricted stock units do not expire.
Option vests 6.25% quarterly over a four-year period.
Each restricted stock unit represents a contingent right to receive one share of Cubist common stock for no consideration.
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.