X0306 4 2019-08-22 0 0001401708 NanoString Technologies Inc NSTG 0001236535 YOUNG WILLIAM 530 FAIRVIEW AVENUE N SEATTLE WA 98109 1 0 0 0 Common Stock 2019-08-22 4 M 0 24125 2.24 A 54125 D Common Stock 2019-08-22 4 S 0 21525 25.17 D 32600 D Common Stock 2019-08-22 4 S 0 2200 26.12 D 30400 D Common Stock 2019-08-22 4 S 0 400 27.03 D 30000 D Stock Option (right to buy) 2.24 2019-08-22 4 M 0 24125 2.24 D 2020-01-26 Common Stock 24125.0 24125 D The sales reported by Mr. Young were effected pursuant to a Rule 10b5-1 trading plan adopted on June 14, 2019. 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 $24.74 to $25.45, 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 $25.76 to $26.36, 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 $26.99 to $27.06, 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 11, 2010 (the "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 2019-08-26