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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
1379222	J Nancy Hutson	C/O Cubist Pharmaceuticals, Inc. 65 Hayden Avenue Lexington MA 02421		Yes	No	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	2013-04-26	5,000	$18.22	8,500	No	4	M	Direct
Common Stock	Disposition	2013-04-26	5,000	$46.23	3,500	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	2013-04-26	5,000	$0.00	5,000	$18.22

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
14,000	2010-06-04	2019-06-04	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 $46.0000 to $46.3300. 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.
Options vest 100% on the earlier of the first anniversary of the grant date or the date of the Company's 2010 Annual Meeting of Stockholders.