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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
1394777	Hiroaki Shigeta	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	2012-04-25	7,500	$7.51	28,414	No	4	M	Direct
Common Stock	Acquisiton	2012-04-25	12,500	$8.28	40,914	No	4	M	Direct
Common Stock	Disposition	2012-04-25	27,500	$21.50	13,414	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
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	2012-04-25	7,500	$0.00	7,500	$7.51
Common Stock	Option (right to buy)	Disposition	2012-04-25	12,500	$0.00	12,500	$8.28

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2019-05-28	No	4	M	Direct
0		2020-06-02	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. Shigeta on March 15, 2012.
As of 4/25/2012, the original grant (7,500 shares granted on 5/28/2009) was fully vested. After the exercise of the options reported hereby, as of 4/25/2012, all of the shares covered by the option were exercised.
As of 4/25/2012, the original grant (12,500 shares granted on 6/2/2010) was fully vested. After the exercise of the options reported hereby, as of 4/25/2012, all of the shares covered by the option were exercised.
The range of prices for the transactions reported on this line is between $21.50 and $21.54 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.