X0306 4/A 2020-10-01 2020-10-02 0 0001114995 IMPINJ INC PI 0001677721 DIORIO CHRIS PH.D. 400 FAIRVIEW AVENUE NORTH SUITE 1200 SEATTLE WA 98109 1 1 0 0 Chief Executive Officer Common Stock 2020-10-01 4 M 0 3906 0.00 A 285731 D Common Stock 2020-10-01 4 S 0 1555 28.331 D 284176 D The Reporting Person's original Form 4 incorrectly stated the amount of securities beneficially owned following the reported transactions. These shares were disposed of in non-discretionary transactions to cover the reporting person's tax withholding obligations in connection with the settlement of an award of restricted stock units. 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 $28.20 to $28.47, 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 ranges set forth herein. /s/ Yukio Morikubo, Attorney in fact for Chris Diorio 2021-02-15