Impinj : Proxy Statement

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

(Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

• Preliminary Proxy Statement
• Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

• Definitive Proxy Statement

• Definitive Additional Materials
• Soliciting Material Pursuant to §240.14a-12

IMPINJ, INC.

(Name of Registrant as Specified In Its Charter)

Payment of Filing Fee (Check all boxes that apply):

• No fee required.

• Fee previously paid with preliminary materials.
• Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

IMPINJ, INC.

400 Fairview Avenue North, Suite 1200

Seattle, WA 98109

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held at 9:00 a.m. Pacific Time on June 6, 2024

TO THE HOLDERS OF COMMON STOCK OF IMPINJ, INC.:

Impinj, Inc., a Delaware corporation, will hold its annual meeting of stockholders virtually on June 6, 2024, 9:00 a.m. Pacific Time via live webcast. You can attend the annual meeting at https://web.lumiconnect.com/253024847. Because we are holding the meeting via the Internet, stockholders will only be able to attend the meeting virtually. We are holding the annual meeting for the following purposes, which are more fully described in the accompanying proxy statement:

1. To elect as directors the seven (7) nominees named in this proxy statement to serve until the 2025 annual meeting of stockholders or until their successors are duly elected and qualified;
2. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2024;
3. To approve, on an advisory basis, the compensation of our named executive officers;
4. To approve an amendment to our amended and restated certificate of incorporation to limit the liability of certain officers as permitted by Delaware law; and
5. To transact such other business as may properly come before the meeting or any adjournments or postponements thereof.

The board of directors of Impinj, Inc. has fixed the close of business on April 17, 2024 as the record date for the annual meeting. Only stockholders of record of our common stock on April 17, 2024 are entitled to notice of, and to vote at, the meeting. Our proxy statement contains further information regarding voting rights and the matters to be voted upon.

We are mailing to our stockholders a Notice of Internet Availability of Proxy Materials (the "Notice") containing instructions on how to access both the proxy statement and our annual report to stockholders. The Notice will also contain instructions on how to vote online or by telephone and how to receive a paper copy of the proxy materials by mail. Our proxy statement and our 2023 annual report to stockholders will be available at the following Internet address: http://www.astproxyportal.com/ast/20867.

YOUR VOTE IS IMPORTANT. Whether or not you plan to attend the annual meeting of stockholders, we urge you to submit your vote via the Internet, telephone or mail.

We appreciate your continued support of Impinj, Inc. and look forward to you joining our virtual meeting or receiving your proxy.

By order of the board of directors,

Chris Diorio, Ph.D.

Chief Executive Officer

Seattle, Washington

April 24, 2024

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IMPINJ, INC.

400 Fairview Avenue North, Suite 1200

Seattle, WA 98109

PROXY STATEMENT

FOR 2024 ANNUAL MEETING OF STOCKHOLDERS

To Be Held at 9:00 a.m. Pacific Time on June 6, 2024

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 June 6, 2024, and any postponements, adjournments or continuations thereof (the "Annual Meeting"). We will hold the Annual Meeting virtually via live webcast on the Internet at https://web.lumiconnect.com/253024847 on June 6, 2024 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 17, 2024, 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 24, 2024, 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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THE PROXY PROCESS AND STOCKHOLDER VOTING QUESTIONS AND ANSWERS

ABOUT THIS PROXY MATERIAL AND VOTING

What matters am I voting on?

You will be voting on:

• the election of Chris Diorio, Daniel Gibson, Umesh Padval, Steve Sanghi, Cathal Phelan, Meera Rao and Miron Washington to our board of directors, each to hold office until the 2025 annual meeting of stockholders or until their successors are duly elected and qualified;
• a proposal to ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2024;
• a proposal for the approval, on an advisory basis, of the compensation of our named executive officers;
• an amendment to our amended and restated certificate of incorporation to limit the liability of certain officers as permitted by Delaware law; and
• any other business that may properly come before the meeting.

How does the board of directors recommend I vote on these proposals?

The board of directors recommends a vote:

• FOR the seven (7) nominees named in this proxy statement for election as directors;
• FOR the ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2024;
• FOR the approval, on an advisory basis, of the compensation of our named executive officers; and
• FOR an amendment to our amended and restated certificate of incorporation to limit the liability of certain officers as permitted by Delaware law.

Who is entitled to vote?

Holders of our common stock as of the close of business on April 17, 2024, the record date, may vote at the Annual Meeting. As of the record date, we had 27,717,098 shares of common stock outstanding. In deciding all matters at the Annual Meeting, each stockholder will be entitled to one vote for each share of common stock held on the record date. We do not have cumulative voting rights for the election of directors.

Registered Stockholders. If your shares are registered directly in your name with our transfer agent, you are considered the stockholder of record with respect to those shares, and we provided the Notice to you directly. As the stockholder of record, you have the right to grant your voting proxy directly to the individuals listed on the proxy card or to vote in person at the Annual Meeting.

Street Name Stockholders. If your shares are held in a stock brokerage account or by a bank or other nominee, you are considered the beneficial owner of shares held in street name, and the Notice was forwarded to you by your broker or nominee, who is considered the stockholder of record with respect to those shares.

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As the beneficial owner, you have the right to direct your broker or nominee how to vote your shares. Beneficial owners are also invited to attend the Annual Meeting. However, since a beneficial owner is not the stockholder of record, you may not vote your shares directly at the Annual Meeting unless you follow your broker's procedures for obtaining a legal proxy. If you request a printed copy of the proxy materials by mail, your broker or nominee will provide a voting instruction card for you to use.

After obtaining a valid legal proxy from your broker, bank or other agent, to then register to attend the Annual Meeting, you must submit proof of your legal proxy reflecting the number of your shares along with your name and email address to Equiniti Trust Company, LLC ("Equiniti"). Requests for registration should be directed to [e-mail]. Written requests can be mailed to:

Equiniti Trust Company, LLC

55 Challenger Road, 2nd Floor Ridgefield Park, New Jersey 07660

Requests for registration must be labeled as "Legal Proxy" and be received no later than 5:00 p.m., Eastern Time, on May 30, 2024.

You will receive a confirmation of your registration and 11-digit voter control number by email issued by Equiniti after we receive your registration materials. You may attend the Annual Meeting and vote your shares at https://web.lumiconnect.com/253024847 during the meeting. The passcode for the meeting is impinj2024. Follow the instructions provided to vote. We encourage you to access the meeting prior to the start time so that you have sufficient time to check in.

How do I vote?

You may vote by following the instructions set forth in the Notice or on your proxy card or, if you are a beneficial owner, by following the procedures provided by your broker or other nominee. You may access the Notice, our proxy materials and our 2023 annual report to stockholders at www.voteproxy.com.

Can I change my vote?

Yes. You can change your vote or revoke your proxy any time before the Annual Meeting by:

• entering a new vote by Internet or by telephone;
• returning a later-dated proxy card;
• notifying the corporate secretary of Impinj, Inc., in writing, at the address listed on the front page; or
• attending and voting, virtually via the Internet, during the Annual Meeting.

Attending the Annual Meeting will not cause your previously granted proxy to be revoked unless you specifically so request.

What is the effect of giving a proxy?

Proxies are solicited by and on behalf of our board of directors. Our board of directors has designated Chris Diorio and Yukio Morikubo as proxy holders. When you properly date, execute and return your proxy card, or properly register your votes online or by phone, the proxy holders will cast votes for your shares at the Annual Meeting as you instruct. If you do not give specific instructions, the proxy holders will vote your

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shares in accordance with the recommendations of our board of directors, as described above. If any matters not described in this proxy statement are properly presented at the Annual Meeting, the proxy holders will use their own judgment to determine how to vote your shares. If the Annual Meeting is adjourned, the proxy holders can vote your shares on the new meeting date as well, unless you properly revoke your proxy instructions. See the section entitled "Can I change my vote?" above.

Why did I receive a notice regarding the availability of proxy materials on the Internet instead of a full set of proxy materials?

As permitted under the rules of the Securities and Exchange Commission (the "SEC"), we have elected to furnish our proxy materials, including this proxy statement and our annual report to stockholders, primarily via the Internet. On or about April 24, 2024, we will begin mailing to our stockholders the Notice that contains instructions on how to access our proxy materials on the Internet, how to vote at the meeting, and how to request printed copies of the proxy materials and annual report to stockholders. You may request to receive all future proxy materials in printed form by mail or electronically by e-mail by following the instructions contained in the Notice. We encourage you to take advantage of the proxy materials on the Internet to help reduce our costs and the environmental impact of our annual meetings.

Who will tabulate the votes?

The inspector of election appointed by our board of directors for the Annual Meeting is responsible for counting votes. The inspector of election will tabulate all votes as required by Delaware law, the state of our incorporation.

What is a quorum?

A quorum is the minimum number of shares required to be present at the Annual Meeting for the meeting to be properly held under our Amended and Restated Bylaws (the "Bylaws") and Delaware law. The presence, in person or by proxy, of a majority of all issued and outstanding shares of common stock entitled to vote at the meeting will constitute a quorum at the meeting. The shares subject to a proxy that are not being voted on a particular proposal because of withholding, abstention or broker non-vote will count for purposes of determining the presence of a quorum.

How many votes are needed for approval of each matter?

• Proposal No. 1: Director nominees will be elected by the affirmative vote of the majority of the votes cast at the Annual Meeting, meaning that the number of shares voted "For" a nominee must exceed the number of shares voted "Against" such nominee. If any incumbent nominee receives a greater number of votes "Against" his or her election than votes "For" such election, our corporate governance guidelines require that such incumbent nominee promptly tender his or her resignation promptly following certification of the applicable stockholder vote; our board of directors, acting through certain qualified independent directors, will then decide whether to accept or reject the resignation, or whether other action should be taken, and we will publicly disclose the board of directors' decision within 90 days of the certification of the election results. Any shares not voted "For" or "Against" a particular nominee (whether as a result of an abstention or a broker non-vote) are not considered "votes cast" and therefore have no effect on the election of director nominees.
• Proposal No. 2: The ratification of the appointment of Ernst & Young LLP must receive the affirmative vote of a majority of the shares present in person or by proxy at the Annual Meeting and entitled to vote thereon. Abstentions are considered votes cast and thus have the same effect as a vote "Against" the proposal. Broker non-votes, if any, will have no impact on this proposal.

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• Proposal No. 3: The approval, on an advisory basis, of our named executive officer compensation must receive the affirmative vote of a majority of the shares present in person or by proxy at the Annual Meeting and entitled to vote thereon. Abstentions are considered votes cast and thus have the same effect as a vote "Against" the proposal. Broker non-votes, if any, will have no impact on this proposal.
• Proposal No. 4: The amendment of our amended and restated certificate of incorporation to limit the liability of certain officers as permitted by Delaware law must receive the affirmative vote of a majority of the shares outstanding as of the record date for the Annual Meeting. Abstentions are considered votes cast and thus have the same effect as a vote "Against" the proposal. Broker non-votes will have the same effect as a vote "Against" this proposal.

How do we solicit proxies for the Annual Meeting?

The board of directors is soliciting proxies for use at the Annual Meeting. We will bear all expenses associated with this solicitation. We will reimburse brokers or other nominees for reasonable expenses that they incur in sending these proxy materials to you if a broker or other nominee holds your shares.

How may my brokerage firm or other intermediary vote my shares if I fail to provide timely directions?

If your broker holds your shares as your nominee (that is, in "street name"), you will need to follow the instructions your broker provides to instruct your broker on how to vote your shares. If you do not give instructions to your broker, your broker can vote your shares with respect to "routine" items, but not with respect to "non-routine" items. The ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2024 (Proposal No. 2) is considered routine under applicable rules. Since a broker or other nominee may generally vote on routine matters, no broker non-votes are expected to exist in connection with this proposal. All of our other proposals are considered non-routine under applicable rules. Absent direction from you, your broker will not have discretion to vote on non-routine matters and therefore there may be broker non-votes in connection with these proposals.

Is my vote confidential?

We handle proxy instructions, ballots, and voting tabulations that identify individual stockholders in a manner that protects your voting privacy. We will not disclose your vote either within Impinj, Inc. or to third parties, except as necessary to meet applicable legal requirements, to allow for the tabulation of votes and certification of such votes, or to facilitate a successful proxy solicitation.

Where can I find the voting results of the Annual Meeting?

We will announce preliminary voting results at the Annual Meeting. We will also disclose voting results on a Current Report on Form 8-K that we will file with the SEC within four business days after the Annual Meeting. If final voting results are not available to us in time to file a Current Report on Form 8-K, we will file a Current Report on Form 8-K to publish preliminary results and will provide the final results in an amendment to the Form 8-K as soon as they become available.

I share an address with another stockholder, and we received only one paper copy of the proxy materials. How may I obtain an additional copy of the proxy materials?

We have adopted a procedure called "householding," which the SEC has approved. Under this procedure, we deliver a single copy of the Notice and, if applicable, the proxy materials to multiple stockholders who share the same address unless we received contrary instructions from one or more of the stockholders. This procedure reduces our printing costs, mailing costs and fees. Stockholders who participate

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in householding will continue to be able to access and receive separate proxy cards. Upon written or oral request, we will deliver promptly a separate copy of the Notice and, if applicable, the proxy materials to any stockholder at a shared address to which we delivered a single copy of any of these documents. To receive a separate copy, or, if you are receiving multiple copies, to request that Impinj, Inc. only send a single copy, of the Notice and, if applicable, the proxy materials, you may contact us as follows:

Impinj, Inc.

Attention: Investor Relations

400 Fairview Avenue North, Suite 1200

Seattle, WA 98109

[phone]

Stockholders who hold shares in street name may contact their brokerage firm, bank, broker-dealer or other similar organization to request information about householding.

What is the deadline to propose actions for consideration at next year's annual meeting of stockholders or to nominate individuals to serve as directors?

Stockholder Proposals

Stockholders may present proposals for inclusion in our proxy statement and for consideration at the next annual meeting of stockholders by submitting their proposals in writing to our corporate secretary in a timely manner.

For a stockholder proposal to be considered for inclusion in our proxy statement for our 2025 annual meeting of stockholders, our

corporate secretary must receive the written proposal at our principal executive offices not later than December 25, 2024. In addition, stockholder proposals must comply with the requirements of Rule 14a-8 regarding the inclusion of stockholder proposals in company-sponsored proxy materials. Stockholders should address proposals to:

Impinj, Inc.

Attention: Corporate Secretary

400 Fairview Avenue North, Suite 1200

Seattle, WA 98109

[phone]

Our Bylaws also establish an advance notice procedure for stockholders who wish to present a proposal before an annual meeting but do not intend for the proposal to be included in our proxy statement. Our Bylaws provide that the only business that may be conducted at an annual meeting is business that is (1) specified in our proxy materials with respect to such meeting (or supplement thereto), (2) otherwise properly brought before the meeting by or at the direction of our board of directors, or any duly authorized committee of our board of directors, or (3) properly brought before the meeting by a stockholder of record entitled to vote at the annual meeting who has delivered timely written notice to our corporate secretary, which notice must contain the information specified in our Bylaws. To be timely for our 2025 annual meeting of stockholders, our corporate secretary must receive the written notice at our principal executive offices:

• not earlier than 8:00 a.m., Pacific time, on February 8, 2025; and
• not later than 5:00 p.m., Pacific time, on March 10, 2025.

If we do not hold our Annual Meeting or if we hold our Annual Meeting more than 25 days from the one-year anniversary date of the 2023 annual meeting, we must receive a notice of a stockholder proposal that

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is not intended to be included in our proxy statement no earlier than 5:00 p.m., Pacific time, on the 120th day before such annual meeting and no later than 5:00 p.m., Pacific time, on the later of the following two dates:

• the 90th day prior to such annual meeting; or
• the 10th day following the day on which public announcement of the date of such meeting is first made.

If, after complying with the provisions above, a stockholder, or such stockholder's qualified representative, does not appear at the annual meeting to present the stockholder's proposal, we are not required to present the proposal for a vote at the meeting.

Recommendation and Nomination of Director Candidates

Stockholders may recommend director candidates for consideration by our nominating and governance committee. Any such recommendations should include the nominee's name and qualifications for membership on our board of directors and should be directed to the corporate secretary of Impinj, Inc. at the address set forth above. For additional information regarding stockholder recommendations of director candidates, see the section entitled "Board of Directors and Corporate Governance-Stockholder Recommendations for the Board of Directors."

In addition, our Bylaws permit stockholders to nominate directors for election at an annual meeting of stockholders. To nominate a director, the stockholder must provide the information required by our Bylaws. In addition, the stockholder must give timely notice to our corporate secretary in accordance with our Bylaws, which, in general, require that our corporate secretary receive the notice within the time period described above under the section entitled "Stockholder Proposals" above for stockholder proposals that are not intended to be included in our proxy statement. Such notice must also comply with Rule 14a-19 under the Exchange Act. For the purposes of Rule 14a-19, the role of our board of directors is to ensure that a stockholder nominee is eligible to be included in our proxy card based on requirements specified in our Amended and Restated Certificate of Incorporation, our Bylaws and under applicable law, not to ensure such nominee's suitability to serve on our board of directors.

Proxy Access

Under our Bylaws, a stockholder (or a group of not more than 20 stockholders) that has held at least 3% of our outstanding common stock continuously for at least three years may nominate and include in our proxy materials for our 2025 annual meeting (i) one director nominee if the number of directors to be elected at the annual meeting is seven or less, and (ii) if the number of directors to be elected at the annual meeting is greater than seven, director nominees constituting up to the greater of 20% of the board of directors or two directors, provided in each case that the requirements set forth in our Bylaws are satisfied. To use this "proxy

access" nomination process, among other things, the electing stockholder(s) and proposed nominee(s) must comply with the detailed requirements set forth in our Bylaws, including the provision of the proposing stockholder information, various other required information, representations, undertakings, agreements and other requirements as set forth in our Bylaws and as required by law. One such requirement is that the nomination(s) must be received in a timely manner between 120 days and 150 days prior to the first anniversary of the date our proxy statement was first sent to stockholders in connection with the last annual meeting, which for our proxy materials for the 2025 annual meeting would be no earlier than November 25, 2024 and no later than December 25, 2024.

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