X0306 4 2021-05-18 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 2021-05-18 4 M 0 3958 8.16 A 3958 D Common Stock 2021-05-18 4 M 0 1271 23.34 A 5229 D Common Stock 2021-05-18 4 S 0 372 48.37 D 4857 D Common Stock 2021-05-18 4 S 0 698 50.11 D 4159 D Common Stock 2021-05-18 4 S 0 1950 51.19 D 2209 D Common Stock 2021-05-18 4 S 0 2209 51.80 D 0 D Stock Option (right to buy) 8.16 2021-05-18 4 M 0 3958 8.16 D 2028-01-15 Common Stock 3958.0 15834 D Stock Options (right to buy) 23.34 2021-05-18 4 M 0 1271 23.34 D 2029-03-25 Common Stock 1271.0 13980 D The sales reported by Mr. Bailey were effected pursuant to a Rule 10b5-1 trading plan adopted on September 14, 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 $48.09 to $48.82, 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 $49.47 to $50.43, 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 $50.55 to $51.545, 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 $51.585 to $52.11, 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. 1/48 of the shares subject to such option shall vest on the one-month anniversary of March 13, 2019 (the "Option Vesting Commencement Date") and 1/48th of the total number of shares each monthly anniversary of the Option Vesting Commencement Date becoming fully vested on the four-year anniversary of the Option Vesting Commencement Date. /s/ Shannon Atchison, Attorney in Fact 2021-05-20