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

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Page 2 of 13 – SEC Filing

CUSIP No. 584688105 13G Page 2 of 13 Pages
1. NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Partner Fund Management, L.P.
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%1

 

12.

TYPE OF REPORTING PERSON

IA; PN

1 The percentages reported in this Schedule 13G are based upon approximately 72,939,570 shares outstanding (comprised of (i) 72,136,728
shares of common stock outstanding as of April 21, 2017 according to the Definitive Proxy on Schedule 14A filed by the issuer with
the Securities and Exchange Commission on April 26, 2017, and (ii) approximately 802,842 shares of common stock issuable upon
the exercise of certain convertible bonds owned by the reporting persons’ affiliates). All of the other numbers and percentages
reported in this Schedule 13G are as of 9:00 a.m. (ET) on the date of filing.

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