Company: INGN
Filing Date: 2025-03-27
Form Type: DEFA14A
Source: 0000950170-25-045738
Chunk: 0

Company: Inogen Inc
Filing Date: 2025-03-27
Form: DEFA14A
Chunk 0
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<div align='center'>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. )</div>

Filed by the Registrantx

Filed by a Party other than the Registranto

Check the appropriate box:

oPreliminary Proxy Statement

oConfidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2))

oDefinitive Proxy Statement

xDefinitive Additional Materials

oSoliciting Material Pursuant to §240.14a-12

<div align='center'>Inogen, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

xNo fee required.

oFee paid previously 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

Your Vote Counts! INOGEN, INC. 2025 Annual Meeting Vote by May 13, 2025 11:59 PM ET. For shares held in a Plan, vote by May 7, 2025 11:59 PM ET. INOGEN, INC. 859 WARD DRIVE, SUITE 200 GOLETA, CA 93111 V67695-P23276 You invested in INOGEN, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 14, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 30, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive