Additional Proxy Soliciting Materials - Form DEFA14A

DEFA14A

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 x

Filed by a Party other than the Registrant o

Check the appropriate box:

o Preliminary Proxy Statement

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

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material Pursuant to §240.14a-12

Inogen, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

x No fee required.

o Fee 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. 2024 annual meeting vote by June 04, 2024 11:59 pm et. For shares held in a plan, vote by may 31, 2024 11:59 pm et. Inogen, inc 859 ward drive goleta, ca 93111 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 material for the stockholder meeting to be held on June 05, 2024. Get informed before you vote view the notice & proxy statement, annual report online or you can receive a free paper or email copy of the material(s) by requesting prior to may 22, 2024. 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 [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.proxyvote.com control # smartphone users point your camera here and vote without entering a control number vote virtually at the meeting* June 05, 2024 10:00 am pdt virtually at: www. Virtualshareholdermeeting.com/ingn2024 *please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1 Election of Class I Directors Nominees: 01) Elizabeth Mora 02) Heather Rider 2. To ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the year ending December 31, 2024. 3. To approve, on an advisory and non-binding basis, the compensation of our named executive officers. 4. To approve the Inogen, Inc. Amended and Restated 2023 Equity Incentive Plan. Board Recommends For For For For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Sign up for E-delivery".

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