X0306 4 2021-11-04 0 0001114995 IMPINJ INC PI 0001057881 VAN OPPEN PETER H 400 FAIRVIEW AVENUE NORTH SUITE 1200 SEATTLE WA 98109 1 0 0 0 Common Stock 2021-11-04 4 S 0 10000 79.0115 D 22825 D 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 $79.00 to $79.105, 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 Peter Van Oppen 2021-11-05