144 0002003074 XXXXXXXX LIVE 0001114995 IMPINJ INC 001-37824 400 FAIRVIEW AVENUE NORTH SUITE 1200 SEATTLE WA 98109 206-517-5300 SYLEBRA CAPITAL LLC See Remarks COMMON STOCK Morgan Stanley & Co. LLC

1585 Broadway New York NY 10036

18427 3077250.03 1600103 12/01/2025 NASDAQ COMMON STOCK J.P. Morgan Securities LLC

383 Madison New York NY 10179

4301 719134.73 1595802 12/01/2025 NASDAQ COMMON STOCK BOFA SECURITIES, INC

One Bryant Park New York NY 10036

4252 710038.16 1591550 12/01/2025 NASDAQ COMMON STOCK Goldman Sachs & Co. LLC

200 West Street New York NY 10282

4078 681134.07 1587472 12/01/2025 NASDAQ COMMON STOCK 03/01/2018 Open Market Purchases.Please refer to explanatory notes under the section of Remarks. Open Market Purchases.Please refer to explanatory notes under the section of Remarks. N 31058 03/01/2018 DVP - Cash. Please refer to explanatory notes under the section of Remarks. N Please see attached Appendixfor complete details

See Appendix See Appendix NY 10036

See Appendix 09/10/2025 300000 58873670.10 Please see attached Appendix for complete details ofsecurities of the Issuer sold during the past three months.Please note that the securities to be sold were acquired from Mar 2018 to Nov 2023 and the date of payment ranged from Mar 2018 to Nov 2023. The reporting person hereby undertakes to provide upon request to the SEC staff or the Issuer full information regarding the number of shares and prices at which the transactions were effected.These securities are held by other advisory clients of the Reporting Person. Daniel Gibson (Mr Gibson) is the sole member and the CIO of the Reporting Person and is a member of the board of directors of the Issuer. Reporting Person and Mr Gibson disclaim beneficial ownership ofthese securities,and this report shall not be deemed ana dmission that Reporting Person and Mr Gibson are the beneficial owners of such securities, except to the extent oftheir pecuniary interest, if any, therein. 12/01/2025 Matthew Whitehead