X0508 4 2023-09-15 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 0 Common Stock 2023-09-15 4 M 0 1562 0.00 A 301159 D Common Stock 2023-09-18 4 S 0 622 63.2224 D 300537 D Common Stock 572494 I by DFT L.L.C. Restricted Stock Units 0.00 2023-09-15 4 M 0 1562 0.00 D Common Stock 1562 4688 D The amount of securities beneficially owned includes 201 shares acquired on August 18, 2023 under the Impinj, Inc. 2016 Employee Stock Purchase Plan, in a transaction exempt under Rule 16b-3(c) that is being voluntarily reported by the reporting person on this Form 4. 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 ("RSUs"). Each RSU represents a contingent right to receive one share of Impinj common stock. On June 15, 2020, the reporting person was granted 25,000 RSUs, one fourth of which vested on June 15, 2021, with an additional one-sixteenth of such RSUs vesting every three months thereafter. One-sixteenth of these RSUs vested on September 15, 2023. /s/ Yukio Morikubo, Attorney in fact for Chris Diorio 2023-09-19