13G Filing: Partner Fund Management and Medicines Co (MDCO)

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Page 3 of 13 – SEC Filing

CUSIP No. 584688105 13G Page 3 of 13 Pages
1. NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Partner
Fund Management GP, LLC
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a)         ¨
(b)        x

3.

SEC USE ONLY

4.

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

5.

SOLE VOTING POWER

0

6.

SHARED VOTING POWER

 

3,881,971 shares

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

See Row 6 above

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

See Row 6 above

10.

CHECK BOX IF
THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES

CERTAIN SHARES

¨

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

5.3%

12.

TYPE OF REPORTING PERSON

OO

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