NEXTNAV INC.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934

Check the appropriate box:

NEXTNAV INC.

(Name of Registrant as Specified In Its Charter)

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

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

April 8, 2026

Dear Fellow Stockholders:

You are cordially invited to attend the Annual Meeting of Stockholders of NextNav Inc. (“NextNav” or the “Company”) to be held on Thursday, May 21, 2026, at 12:00 p.m. (Eastern Time) (the “Annual Meeting”). The Annual Meeting will be conducted as a virtual meeting via live webcast online at www.virtualshareholdermeeting.com/NN2026.

If you attend the Annual Meeting, you will be able to vote and submit questions during the Annual Meeting by using the control number we provide to you in the Notice of Internet Availability of Proxy Materials (the “Notice”), which describes the availability of these proxy materials over the Internet. We will begin sending the Notice to our stockholders on or about April 8, 2026, which will contain instructions on how to access our 2026 Proxy Statement (the “Proxy Statement”) and Annual Report on Form 10-K for the year ended December 31, 2025, as well as instructions on how to vote. Internet distribution of our proxy materials expedites receipt by stockholders, lowers the cost of the Annual Meeting, and conserves natural resources. Stockholders who receive the Notice will not receive a printed copy of the proxy materials in the mail; however, if you would prefer to receive paper copies of our proxy materials, please follow the instructions included in the Notice.

Please refer to the Proxy Statement for detailed information on each of the proposals and the Annual Meeting. Your vote is important, and we strongly urge all stockholders to vote their shares. For the election of directors, your shares will not be voted unless you provide voting instructions via the Internet or by returning a proxy card or voting instruction card. We encourage you to vote promptly, even if you plan to virtually attend the Annual Meeting.

Best regards,

Mariam Sorond

President and Chief Executive Officer and Chair of the Board of Directors

NextNav Inc.

11911 Freedom Drive, Suite 200

Reston, Virginia 20190

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held May 21, 2026

To our Stockholders:

NOTICE IS HEREBY GIVEN that NextNav’s Annual Meeting will be held solely by means of live webcast online atwww.virtualshareholdermeeting.com/NN2026 on Thursday, May 21, 2026, at 12:00 p.m. (Eastern Time), to consider and vote on the following matters described in the accompanying Proxy Statement:

Our Board has fixed March 24, 2026, as the record date (the “Record Date”) for the determination of stockholders entitled to notice of, and to vote at, the Annual Meeting. Only stockholders of record at the close of business on the Record Date will be entitled to notice of and to vote at the Annual Meeting or any adjournment or postponement thereof. A list of stockholders entitled to vote at the Annual Meeting will be available for examination by any stockholder for any purpose relevant to the Annual Meeting during ordinary business hours during the ten (10) days prior to the date of the Annual Meeting at 11911 Freedom Drive, Suite 200, Reston, Virginia 20190.

Our Board unanimously recommends that you vote “FOR ALL” for Proposal 1 and “FOR” Proposal 2.

By hosting the Annual Meeting online, we are able to effectively communicate with our stockholders, enable increased attendance and participation from locations around the world, reduce financial and environmental costs and increase overall efficiency and safety for both us and our stockholders. The Annual Meeting has been designed to provide the same rights to participate as you would have at an in-person meeting. Whether or not you expect to attend, you are respectfully requested by our Board to promptly either sign, date and return the proxy card (if you requested a paper copy) or vote by telephone or via the Internet by following the instructions provided on the Notice.

By Order of the Board of Directors,

/s/ James Black

Senior Vice President, General Counsel and Secretary

Reston, Virginia

Important Notice Regarding the Availability of Proxy Materials for the

Annual Meeting of Stockholders to be Held on May 21, 2026:

Copies of our Proxy Materials, consisting of the Notice of Internet Availability of Proxy Materials, the

Proxy Statement and accompanying Form of Proxy Card, and our 2025 Annual Report on Form 10-K, are

available atwww.proxyvote.com.

YOUR VOTE IS IMPORTANT

If your shares are held in a brokerage account or by another nominee record holder and you do not receive a Notice, please be sure to mark your voting choices on the voting instruction card that accompanies this Proxy Statement. If you fail to specify your voting instructions for certain of the proposals, your shares will not be voted on such proposals due to rules applicable to broker voting, and we may incur additional costs to solicit votes.

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