X0306 4 2022-10-01 0 0001114995 IMPINJ INC PI 0001259761 PHELAN CATHAL G 400 FAIRVIEW AVE N. SUITE 1200 SEATTLE WA 98109 1 0 0 0 Restricted Stock Units 0.00 2022-10-01 4 A 0 8000 0.00 A Common Stock 8000 8000 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of Impinj common stock. The RSUs were approved by the Compensation Committee of the Issuer's Board of Directors in connection with certain consulting services being provided by the Reporting Person. 25% of the RSUs will vest on each of January 1, 2023, April 1, 2023, July 1, 2023 and October 1, 2023, subject in each case to the Reporting Person continuing to be a service provider on each such vesting date. /s/ Yukio Morikubo, Attorney in fact for Cathal G. Phelan 2022-10-03