DEFA14A

DEFA14A 1 fly_2026_naa_defa14a.htm 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

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

Firefly Aerospace 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 the appropriate box):

☒ No fee required.

☐ 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.

FIREFLY AEROSPACE PROXY TABULATOR: P.O. BOX 8016, CARY, NC 27512-9903 Your vote matters! Firefly Aerospace Inc. Annual Meeting of Stockholders Thursday, June 4, 2026, 8:30 AM, Central Time Annual Meeting will be conducted virtually, via live audio webcast. Please visit www.proxydocs.com/FLY for more details. You must register to attend the meeting online and/or participate at www.proxydocs.com/FLY For a convenient way to view proxy materials, VOTE, and obtain directions to attend the meeting go to www.proxydocs.com/FLY To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the Internet. If you want to receive a paper or e-mail copy of the proxy material, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before May 24, 2026. Meeting Materials: Notice of Meeting and Proxy Statement & Annual Report on Form 10-K Important Notice Regarding The Availability Of Proxy Materials For The Stockholders Meeting To Be Held On June 4, 2026 For Stockholders Of Record As Of April 7, 2026 To order paper materials, use one of the following methods. Internet: www.proxydocs.com/FLY Call: 1-866-648-8133 Email: paper@investorelections.com * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Your control number Have the 12 digit control number located in the box above available when you access the website and follow the instructions. SEE REVERSE FOR FULL AGENDA Copyright © 2026 BetaNXT, Inc. or its affiliates. All Rights Reserved

FIREFLY AEROSPACE THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FOR EACH DIRECTOR NOMINEE IN PROPOSAL 1 AND FOR PROPOSAL 2 Firefly Aerospace Inc. Annual Meeting of Stockholders PROPOSAL 1. To elect the two nominees identified in the accompanying proxy statement to our Board of Directors: 1.01 Jason Kim 1.02 Kevin McAllister 2. To ratify the appointment of Grant Thornton LLP as our independent registered public accounting firm for the year ending December 31, 2026. NOTE: In their discretion, the Named Proxies are authorized to vote upon such other business as may properly come before the Annual Meeting or any adjustments or postponements thereof.

SEC Form DEFA14A filed by Firefly Aerospace Inc.