Firefly CTO has 16,700 shares withheld for tax

Firefly Aerospace’s CTO had shares withheld to cover taxes on RSU vesting, leaving him with over half a million shares held directly.

Available on EDGAR 09/18/2026 - 09:27 PM EDT Accepted by SEC EDGAR 09/18/2026 - 09:27 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Firefly Aerospace Inc. (FLY) reported that Chief Technology Officer Ferring Russell Shea had 16,700 shares of common stock withheld on September 16, 2026 to satisfy his tax withholding obligation upon vesting of restricted stock units. The shares were treated as a disposition at $20.28 per share, and he now holds 525,424 shares directly. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 16,700 shares

Tax Withholding 1 txn

Insider Ferring Russell Shea

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	16,700	$20.28	$339K

Holdings After Transaction: Common Stock — 525,424 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 tax: 16,700 shares Per-share value for withholding: $20.28 per share Shares held after transaction: 525,424 shares +2 more

5 metrics

Shares withheld for tax 16,700 shares Common stock withheld on September 16, 2026 to cover tax on RSU vesting

Per-share value for withholding $20.28 per share Reported price for the 16,700 withheld shares

Shares held after transaction 525,424 shares Direct common stock holdings after September 16, 2026 transaction

Transaction date September 16, 2026 Date of tax-withholding disposition of common stock

Transaction type Payment of tax liability by withholding shares Code F, non-derivative common stock

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 its CTO?

Firefly Aerospace disclosed that CTO Ferring Russell Shea had 16,700 shares of common stock withheld on September 16, 2026 to cover his tax withholding obligation upon vesting of restricted stock units.

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

The transaction was a tax-withholding disposition. Shares of common stock were withheld by the issuer to satisfy the reporting person’s tax withholding obligation when restricted stock units vested, rather than an open market sale.

At what price were the withheld Firefly Aerospace (FLY) shares valued in the CTO’s Form 4?

The 16,700 shares withheld for tax purposes were reported at $20.28 per share, as reflected in the Form 4 transaction details for September 16, 2026.

How many Firefly Aerospace (FLY) shares does the CTO hold after the reported transaction?

After the tax-withholding transaction, CTO Ferring Russell Shea directly holds 525,424 shares of Firefly Aerospace common stock, according to the Form 4 disclosure.

Was the Firefly Aerospace (FLY) CTO’s share withholding done under a Rule 10b5-1 plan?

No. The filing indicates no Rule 10b5-1 trading plan for this transaction; the document-level 10b5-1 checkbox is not marked as being made under such a plan.

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^*

Ferring Russell Shea

(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 Technology 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		16,700(1)	D	$20.28	525,424	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)