X0306 4 2021-01-01 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 2021-01-01 4 M 0 3906 0.00 A 276247 D Common Stock 2021-01-04 4 M 0 14000 21.81 A 290247 D Common Stock 2021-01-06 4 S 0 1639 43.9918 D 288608 D Common Stock 2021-01-06 4 S 0 7720 45.00 D 280888 D Common Stock 689999 I by DFT L.L.C. Restricted Stock Units 0.00 2021-01-01 4 M 0 3906 0.00 D Common Stock 3906 39063 D Stock Option (Right to Buy) 21.81 2021-01-04 4 M 0 14000 0.00 D 2026-08-22 Common Stock 14000 49000 D 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 $43.805 to $44,135, 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. The sales reported by Dr. Diorio were effected pursuant to a Rule 10b5-1 trading plan adopted on August 24, 2020. Each restricted stock unit represents a contingent right to receive one share of Impinj common stock. On September 5, 2019, the reporting person was granted 62,500 restricted stock units ("RSUs"), one fourth of which vested on July 1, 2020, with an additional one-sixteenth of such RSUs vesting every three months thereafter. One-sixteenth of these RSUs vested on January 1, 2021. One-fourth of the shares subject to the option vested on August 23, 2017, and 1/48th of the shares subject to the option vested each month thereafter. /s/ Yukio Morikubo, Attorney in fact for Chris Diorio 2021-01-06