X0306 4 2021-07-30 0 0001114995 IMPINJ INC PI 0001578147 DOSSETT JEFFREY 400 FAIRVIEW AVE N. SUITE 1200 SEATTLE WA 98109 0 1 0 0 Chief Revenue Officer Common Stock 2021-07-30 4 M 0 1500 17.33 A 38515 D Common Stock 2021-07-30 4 S 0 1500 43.60 D 37015 D Common Stock 2021-07-31 4 M 0 1563 0.00 A 38578 D Common Stock 2021-08-02 4 S 0 606 46.726 D 37972 D Stock Option (Right to Buy) 17.33 2020-07-30 4 M 0 1500 0.00 D 2028-05-16 Common Stock 1500 56259 D Restricted Stock Unit 0.00 2021-07-31 4 M 0 1563 0.00 D Common Stock 1563 12501 D The sales reported by Mr. Dossett were effected pursuant to a Rule 10b5-1 trading plan adopted on September 14, 2020. 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 $46.705 to $46.75, 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. One-fourth of the shares subject to the option vested on November 16, 2018, and 1/48th of the shares subject to the option shall vest on the 3rd day of each month thereafter Each restricted stock unit represents a contingent right to receive one share of Impinj common stock. On July 31, 2019, the reporting person was granted 25,000 restricted stock units ("RSUs"). One-sixteenth of these RSUs vested on July 31, 2021. /s/ Yukio Morikubo, Attorney in fact for Jeffrey Dossett 2021-08-03