144 0002003074 XXXXXXXX LIVE 0001114995 IMPINJ INC 001-37824 400 FAIRVIEW AVENUE NORTH SUITE 1200 SEATTLE WA 98109 206-517-5300 SYLEBRA CAPITAL LLC 10% Stockholder Common Stock Goldman Sachs & Co. LLC

200 West Street New York NY 10282

51823 10106671.75 2947352 11/04/2024 NASDAQ Common Stock Morgan Stanley & Co. LLC

1585 Broadway New York NY 10036

43847 8569106.90 2903505 11/04/2024 NASDAQ Common Stock 03/01/2017 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 95670 04/01/2017 DVP- Cash. Please refer to explanatory notes under the section of Remarks. N Goldman Sachs & Co. LLC

200 West Street New York NY 10282

Common Stock 10/29/2024 143773 29034526.03 Goldman Sachs & Co. LLC

200 West Street New York NY 10282

Common Stock 10/30/2024 32031 6257416.01 Goldman Sachs & Co. LLC

200 West Street New York NY 10282

Common Stock 11/01/2024 22373 4362735.00 Goldman Sachs & Co. LLC

200 West Street New York NY 10282

Common Stock 11/04/2024 51823 10106671.75 Morgan Stanley & Co. LLC

1585 Broadway New York NY 10036

Common Stock 11/04/2024 43847 8569106.90 Please note that the securities to be sold were acquiredfrom Mar 2017 to Aug 2023 and the date of payment ranged from Apr 2017 to Aug 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. 11/04/2024 Matthew Whitehead