Firefly Aerospace Inc.

Item 5. Other Information

Changes to Compensatory Arrangements of Named Executive Officers

On September 16, 2025, the Compensation Committee (the “Committee”) of the Board of Directors of the Company approved retention awards in the form of restricted stock units (“RSUs”) for each of the NEOs, effective as of September 24, 2025 (the “Grant Date”) (which date coincides with the date on which the Company’s trading window opens under its Insider Trading Policy), in the following amounts: 888,889 RSU shares were awarded to Mr. Kim; 222,222 RSU shares were awarded to Mr. Ma; and 88,889 RSU shares were awarded to Mr. Fermon.

The RSUs were granted under the Firefly Aerospace Inc. 2025 Omnibus Incentive Plan (the “Plan”) and, except as otherwise provided in the Restricted Stock Unit Award Agreement, will vest in four nearly equal annual installments on September 16, 2026, 2027 and 2028, subject in each case to the executive’s continued employment with the Company through the respective vesting date.

The aforementioned RSU grants will otherwise be subject to the terms of the Plan and the terms and conditions set forth in the Restricted Stock Unit Award Agreement, the form of which is filed as Exhibit 10.14 to the Company’s Registration Statement on Form S-1/A, filed with the Commission on August 4, 2025, and incorporated herein by reference.

Insider Trading Arrangements

During the three months ended June 30, 2025, none of our directors or officers (as defined in Section 16 of the Exchange Act)adopted, modified orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” as such terms are defined under Item 408 of Regulation S-K.