X0306 4 2017-04-03 0 0001401708 NanoString Technologies Inc NSTG 0001575739 GRAY R BRADLEY 530 FAIRVIEW AVENUE N. SEATTLE WA 98109 1 1 0 0 President and CEO Common Stock 2017-04-03 4 S 0 1100 20.58 D 75785 D The sales reported by Mr. Gray were effected pursuant to a Rule 10b5-1 trading plan adopted on September 15, 2016. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $20.50 to $20.66, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein. /s/ Shannon Atchison, attorney in fact 2017-04-05