IMPINJ INC

FOR 2026 ANNUAL MEETING OF STOCKHOLDERS

To Be Held at 9:00 a.m. Pacific Time on May 28, 2026

We are furnishing this proxy statement and the enclosed form of proxy in connection with a solicitation of proxies by our board of directors for use at our annual meeting of stockholders to be held on May 28, 2026, and any postponements, adjournments or continuations thereof (the “Annual Meeting”). We will hold the Annual Meeting virtually via live webcast on the Internet at www.virtualshareholdermeeting.com/PI2026 on May 28, 2026 at 9:00 a.m. Pacific Time.

We have elected to provide access to our proxy materials on the Internet. Accordingly, we are mailing a Notice of Internet Availability of Proxy Materials (the “Notice”) to our stockholders of record as of April 8, 2026, containing instructions on how to access both the proxy materials for our Annual Meeting and our annual report to stockholders. All stockholders will have the ability to access the proxy materials on the website referred to in the Notice, or to request a printed set of the proxy materials. You can find instructions on how to request a printed copy by mail in the below section entitled “The Proxy Process and Stockholder Voting Questions and Answers About This Proxy Material and Voting.” This information is largely about voting procedure. You should read this entire proxy statement carefully for additional information about proposals on which we encourage you to vote. On or about April 16, 2026, we will begin mailing the Notice to all stockholders entitled to vote at the Annual Meeting. Stockholders will be able to access our proxy materials over the Internet beginning on or about the same date. We intend to mail this proxy statement, together with the form of proxy, to those stockholders entitled to vote at the Annual Meeting who have properly requested copies of such materials by mail.

Information contained on, or that can be accessed through, our website is not intended to be incorporated by reference into this proxy statement and references to our website address in this proxy statement are inactive textual references only.

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