X0508 4 2024-02-22 0001114995 IMPINJ INC PI 0001677721 DIORIO CHRIS PH.D. 400 FAIRVIEW AVENUE NORTH SUITE 1200 SEATTLE WA 98109 true true false false CHIEF EXECUTIVE OFFICER 1 Common Stock 2024-02-22 4 A 0 25000 0 A 278738 D Common Stock 2024-02-22 4 A 0 16185 0 A 294923 D Common Stock 2024-02-23 4 S 0 8187 100.4910 D 286736 D Common Stock 2024-02-23 4 S 0 7569 101.8305 D 279167 D Common Stock 2024-02-23 4 S 0 304 102.4945 D 278863 D Common Stock 2024-02-26 4 A 0 5000 21.81 A 283863 D Common Stock 2024-02-26 4 S 0 5000 105 D 278863 D Common Stock 572494 I by DFT L.L.C. Stock Option (right to buy) 21.81 2024-02-26 4 M 0 5000 0 D 2026-08-23 Common Stock 5000 31661 D On April 12, 2021, the Reporting Person was granted performance restricted stock units (PSUs). The PSUs vested upon the Reporting Person's satisfaction of certain performance criteria. On February 21, 2024, the Issuer's Board of Directors determined the level at which the corporate performance goals were attained, resulting in the vesting of 25,000 shares of Common Stock underlying the PSUs. The amount of securities beneficially owned includes 427 shares acquired on February 20, 2024 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. On March 23, 2022, the Reporting Person was granted performance restricted stock units (PSUs). The PSUs vested upon the Reporting Person's satisfaction of certain performance criteria. On February 21, 2024, the Issuer's Board of Directors determined the level at which the corporate performance goals were attained, resulting in the vesting of 16,185 shares of Common Stock underlying the PSUs. 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 $100.23 to $101.16, 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. These shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs"). 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 $101.31 to $102.30, 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. These shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs"). 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 $102.33 to $102.50, 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 effective on November 6, 2023. The option became fully vested on August 23, 2020. /s/ Yukio Morikubo, Attorney in fact for Chris Diorio 2024-02-26