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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
1194185	M Armin Kessler	8 Sylvan Way Parsippany NJ 07054		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
Common Stock	Acquisiton	2013-05-29	12,500	$23.00	123,185	No	4	M	Direct
Common Stock	Disposition	2013-05-29	8,750	$33.05	114,435	No	4	S	Direct
Common Stock	Acquisiton	2013-05-30	3,849	$0.00	118,284	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	A	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option (Right-to-buy)	Disposition	2013-05-29	12,500	$0.00	12,500	$23.00
Common Stock	Option (Right-to-buy)	Acquisiton	2013-05-30	9,763	$0.00	9,763	$33.13

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2013-05-29	No	4	M	Direct
9,763		2023-05-30	No	4	A	Direct

Footnotes

The range of prices for the transactions reported on this line is between $33.00 and $33.07 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 information regarding the number of shares sold at each separate price.
The shares of restricted stock vest in one installment on May 30, 2014.
As of May 29,2013, the original grant (12,500 shares granted on May 29, 2003) was fully vested.
This option vests in one installment on May 30, 2014.