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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1113481	Medicines Co	MDCO	Pharmaceutical Preparations (2834)	043324394

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1277478	Glenn Sblendorio	8 Sylvan Way Parsippany NJ 07054	President & Cfo	Yes	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	2013-01-08	25,000	$19.36	122,282	No	4	M	Direct
Common Stock	Disposition	2013-01-08	25,000	$28.07	97,282	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	Option (right to buy)	Disposition	2013-01-08	25,000	$0.00	25,000	$19.36

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
49,495		2018-02-15	No	4	M	Direct

Footnotes

The common stock sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 program adopted by Mr. Sblendorio on February 18, 2011.
The range of prices for the transactions reported on this line is between $27.61 and $28.96 per share. The price reported above reflects the weighted average sales price. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full informaton regarding the number of shares sold at each separate price.
As of 1/8/2013, the original grant (99,495 shares granted on 2/15/2008) was fully vested. After the exercise of the options reported hereby, as of 1/8/2013, the remaining 49,495 shares covered by this option are vested but not exercised.