Nanostring Technologies (NSTG): Foresite Capital Growing More Bullish

1.

NAME OF REPORTING PERSONS          Foresite Capital Fund II, L.P. (“FCF II”)

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

5.

SOLE VOTING POWER

727,857 shares, except that Foresite Capital Management II, LLC (“FCM II”), the general partner
of FCF II, may be deemed to have sole power to vote these shares, and James Tananbaum (“Tananbaum”), the managing member
of FCM II, may be deemed to have sole power to vote these shares.

6.

SHARED VOTING POWER

See response to row 5.

7.

SOLE DISPOSITIVE POWER

727,857 shares, except that FCM II, the general partner of FCF II, may be deemed to have sole power to
dispose of these shares, and Tananbaum, the managing member of FCM II, may be deemed to have sole power to dispose of these shares.

8.

SHARED DISPOSITIVE POWER

See response to row 7.

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

727,857

10.

CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES

o

11.

 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW
(9)

3.7%

12.

TYPE OF REPORTING PERSON

PN