Prospectus

Summary

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• Thomas Zurbuchen notified the Board on September 30, 2026 of his decision to resign as a director, effective September 30, 2026, not as a result of any disagreement with the Company.
• On October 5, 2026, the Board appointed Rick Ambrose, age 68, as a Class III director with a term expiring at the 2028 annual meeting of stockholders.
• Mr. Ambrose was also appointed to the Audit Committee and the Compensation Committee, and the Board determined he is independent under Nasdaq and SEC rules.
• Mr. Ambrose retired in March 2022 as Executive Vice President-Space of Lockheed Martin Corporation, where he led Lockheed Martin's $12 billion Space business, and currently serves on the board of Textron Inc.
• As a newly appointed director, Mr. Ambrose will receive a one-time grant of restricted stock units with a value of $150,000 and an annual cash retainer of $100,000 for Board service.
• The prospectus supplement relates to up to 11,111,116 shares received by Selling Securityholders as consideration in Firefly's acquisition of SciTec Innovations, LLC.

Why it mattersThe filing changes Firefly Aerospace's board composition, replacing Thomas Zurbuchen with Rick Ambrose, who led Lockheed Martin's Space business. Ambrose joins the Audit and Compensation Committees.