X0306 4 2014-09-02 0 0001401708 NanoString Technologies Inc NSTG 0001225501 JOHNSON JAMES A 530 FAIRVIEW AVENUE N. SUITE 2000 SEATTLE WA 98109 0 1 0 0 Chief Financial Officer Common Stock 2014-09-02 4 A 0 1063 6.6215 A 2159 D The reporting person is voluntarily reporting the acquisition of shares of the issuer's common stock pursuant to the NanoString Technologies, Inc. Employee Stock Purchase Plan ("ESPP"), for the ESPP Purchase Period (as defined in the ESPP) of March 3, 2014 through September 2, 2014. This transaction is also exempt under Rule 16b-3(c). The Purchase Period ended on September 2, 2014 and is the second of two Purchase Periods comprising the Offering Period (as defined in the ESPP) that began on August 16, 2013 (the "Enrollment Date"). In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on the Enrollment Date. /s/ Barbara A. Mery, Attorney-in-fact 2014-09-04