Firefly CEO has 86,265 shares withheld for taxes

Firefly Aerospace’s CEO had shares withheld for taxes on RSU vesting and now directly holds 855,460 common shares.

Available on EDGAR 09/18/2026 - 08:59 PM EDT Accepted by SEC EDGAR 09/18/2026 - 08:58 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Firefly Aerospace Inc. (FLY) reported that Chief Executive Officer and director Kim Jesung had 86,265 shares of common stock withheld on September 16, 2026 to cover a tax withholding obligation upon the vesting of restricted stock units. After this tax-withholding disposition, Kim Jesung holds 855,460 shares directly, and no Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Tax Withholding: 86,265 shares

Tax Withholding 1 txn

Insider Kim Jesung

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	86,265	$20.28	$1.75M

Holdings After Transaction: Common Stock — 855,460 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: 86,265 shares Price per share for withheld shares: $20.28 per share Shares held after transaction: 855,460 shares

3 metrics

Shares withheld for taxes 86,265 shares Common stock withheld on September 16, 2026 to satisfy tax withholding on RSU vesting

Price per share for withheld shares $20.28 per share Valuation used for the 86,265 shares withheld for tax withholding

Shares held after transaction 855,460 shares Common shares directly owned by CEO Kim Jesung 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 Inc. (FLY) disclose for Kim Jesung?

Firefly Aerospace disclosed that CEO and director Kim Jesung had 86,265 shares of common stock withheld on September 16, 2026 to satisfy a tax withholding obligation related to the vesting of restricted stock units.

How many Firefly Aerospace (FLY) shares does CEO Kim Jesung hold after the reported transaction?

After the September 16, 2026 tax-withholding disposition, CEO Kim Jesung directly holds 855,460 shares of Firefly Aerospace common stock, as reported in the Form 4.

Was the Firefly Aerospace (FLY) insider transaction a market sale or a tax withholding?

The transaction was a tax withholding event. The Form 4 and its footnote state that 86,265 shares were withheld by Firefly Aerospace to cover Kim Jesung’s tax withholding obligation upon vesting of restricted stock units.

At what price per share were the withheld Firefly Aerospace (FLY) shares valued?

The 86,265 shares withheld to cover taxes were valued at a reported price of $20.28 per share, according to the Form 4 transaction details.

Was Firefly Aerospace (FLY) CEO Kim Jesung’s transaction under a Rule 10b5-1 plan?

No. The Form 4 indicates that no Rule 10b5-1 trading plan is reported for this transaction, and the document-level 10b5-1 checkbox is not checked.

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

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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^*

Kim Jesung

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive 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		86,265(1)	D	$20.28	855,460	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)