13G Filing: Partner Fund Management and Endologix Inc (ELGX)

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Page 2 of 13 – SEC Filing

CUSIP No. 29266S106 13G Page 2 of 13 Pages

1.

NAME OF REPORTING PERSONS

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)     o

(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

5,278,282 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

o

11.

 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW
(9)

6.4%1

12.

TYPE OF REPORTING PERSON

IA; PN

1 The
percentages reported in this Schedule 13G are based upon 82,975,063 shares of common stock outstanding as of May 1, 2017 according
Form 10-Q filed by the issuer with the Securities and Exchange Commission on May 5, 2017. 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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