X0306 4 2020-06-30 0 0001401708 NanoString Technologies Inc NSTG 0001432055 Bailey K Thomas 530 FAIRVIEW AVENUE N SEATTLE WA 98109 0 1 0 0 Chief Financial Officer Common Stock 2020-06-30 4 S 0 3260 29.1733 D 0 D The sales reported by Mr. Bailey were effected pursuant to a Rule 10b5-1 trading plan adopted on June 14, 2019 and amended on June 3, 2020. 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 $28.91 to $29.44, 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 2020-07-02