Firefly CAO has 1,827 shares withheld for taxes

Firefly Aerospace’s chief accounting officer had shares withheld for taxes on RSU vesting, leaving 38,596 common shares directly held.

Rhea-AI Filing Summary

Firefly Aerospace Inc. (FLY) reported that Chief Accounting Officer Remington Wu had 1,827 shares of common stock withheld on September 16, 2026 to satisfy his tax withholding obligation upon vesting of restricted stock units. After this tax-withholding disposition, he holds 38,596 shares of common stock directly. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 1,827 shares

Tax Withholding 1 txn

Insider Wu Remington

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,827	$20.28	$37K

Holdings After Transaction: Common Stock — 38,596 shares (Direct)

Footnotes (1)

1. F1. Represents shares of common stock withheld by the Issuer to cover the reporting person's tax withholding obligation upon the vesting of restricted stock units.

Key Figures

Shares withheld for taxes: 1,827 shares Per-share value for withheld shares: $20.28 per share Shares held after transaction: 38,596 shares

3 metrics

Shares withheld for taxes 1,827 shares Common stock withheld on September 16, 2026 for tax withholding on RSU vesting

Per-share value for withheld shares $20.28 per share Value reported for the 1,827 common shares withheld for tax withholding

Shares held after transaction 38,596 shares Direct holdings of Remington Wu following the September 16, 2026 transaction

Key Terms

restricted stock units, tax withholding obligation, withheld by the Issuer

3 terms

restricted stock units financial

"upon the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligation financial

"to cover the reporting person's tax withholding obligation"

withheld by the Issuer financial

"Represents shares of common stock withheld by the Issuer"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Firefly Aerospace (FLY) disclose for Remington Wu?

Firefly Aerospace disclosed that Chief Accounting Officer Remington Wu had 1,827 common shares withheld on September 16, 2026 to satisfy tax withholding arising from vesting of restricted stock units.

Was the Firefly Aerospace (FLY) Form 4 transaction an open-market sale?

No. The Form 4 states the 1,827 shares were withheld by the issuer to cover Remington Wu’s tax withholding obligation upon vesting of restricted stock units, rather than sold in the open market.

How many Firefly Aerospace (FLY) shares does Remington Wu hold after this transaction?

After the September 16, 2026 tax-withholding disposition, Remington Wu directly holds 38,596 shares of Firefly Aerospace common stock, as reported in the Form 4.

What price per share is associated with the Firefly Aerospace (FLY) tax-withholding shares?

The Form 4 reports a value of $20.28 per share for the 1,827 Firefly Aerospace common shares withheld to satisfy Remington Wu’s tax withholding obligation.

Was the Firefly Aerospace (FLY) insider transaction under a Rule 10b5-1 plan?

No. The Form 4’s Rule 10b5-1 checkbox is not marked as affirming a plan, and no footnote indicates a trading plan; the transaction is reported as not made under a Rule 10b5-1 plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/18/2026 - 09:11 PM Accepted by SEC EDGAR 09/18/2026 - 09:11 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Wu Remington

(Last) (First) (Middle)

C/O FIREFLY AEROSPACE INC.

2203 SCOTTSDALE DRIVE

(Street)

LEANDER TEXAS 78641

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Firefly Aerospace Inc. [ FLY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/16/2026		F		1,827(1)	D	$20.28	38,596	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares of common stock withheld by the Issuer to cover the reporting person's tax withholding obligation upon the vesting of restricted stock units.

Remarks:

Exhibit 24.1 - Power of Attorney

	/s/ Nathan O'Konek, Attorney-in-fact	09/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)