X0306 4 2020-08-18 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 2020-08-18 4 M 0 5938 8.16 A 5938 D Common Stock 2020-08-18 4 S 0 5716 38.92 D 222 D Common Stock 2020-08-18 4 S 0 222 39.47 D 0 D Stock Option (right to buy) 8.16 2020-08-18 4 M 0 5938 8.16 D 2028-01-15 Common Stock 5938.0 33646 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 $38.40 to $39.36, 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. 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 $39.46 to $39.60, 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. 25% of the shares subject to the Option vest on the one-year anniversary of January 16, 2018 (the "Option Vesting Commencement Date"), and thereafter 1/48th of the shares subject to the Option vest on each monthly anniversary of the Vesting Commencement Date. /s/ Shannon Atchison, Attorney in Fact 2020-08-20