13G Filing: Partner Fund Management and Jounce Therapeutics Inc (JNCE)

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Page 2 of 13 – SEC Filing

CUSIP No. 481116101 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

 

1,727,943 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)

5.4%1

12.

TYPE OF REPORTING PERSON

IA; PN

1 The percentages reported in this Schedule 13G are based upon 32,194,213 shares of common stock outstanding
as of August 4, 2017 according to the Form 10-Q filed by the issuer with the Securities and Exchange Commission on August 9, 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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