Firefly Aerospace Inc. (FLY): Thomas Markusic reports 5.2% ownership stake

Rhea-AI Filing Summary

Firefly Aerospace Inc. major shareholder Thomas Markusic filed an updated statement of ownership reporting beneficial ownership of 8,816,520 shares of Common Stock. This represents 5.2% of the company’s Common Shares outstanding, calculated using 167,404,645 shares outstanding as of August 6, 2026, plus option shares.

Markusic has sole voting and dispositive power over 8,581,146 shares, consisting of 4,807,819 shares of Common Stock and 4,008,701 shares issuable upon exercise of options. He also has shared voting and dispositive power over 235,374 shares of Common Stock owned by his spouse.

Key Figures

Beneficial ownership: 8,816,520 shares Ownership percentage: 5.2% Sole voting and dispositive power: 8,581,146 shares +3 more

6 metrics

Beneficial ownership 8,816,520 shares Total Firefly Aerospace Common Stock beneficially owned by Thomas Markusic

Ownership percentage 5.2% Portion of Firefly Aerospace Common Shares beneficially owned by Thomas Markusic

Sole voting and dispositive power 8,581,146 shares Shares over which Markusic has sole power, including option shares

Option shares included 4,008,701 shares Common Stock issuable upon exercise of options held by Markusic

Spouse-owned shares 235,374 shares Shares owned by Markusic’s spouse with shared voting and dispositive power

Shares outstanding baseline 167,404,645 shares Firefly Aerospace Common Shares outstanding as of August 6, 2026

Key Terms

beneficially owned, sole voting power, shared dispositive power, dispositive power, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 8,816,520"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole Voting Power 8,581,146.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared dispositive power financial

"Shared Dispositive Power 235,374.00"

dispositive power financial

"Sole Dispositive Power 8,581,146.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Common Stock issuable upon exercise of options financial

"4,008,701 shares of Common Stock issuable upon exercise of options"

FAQ

What percentage of Firefly Aerospace Inc. (FLY) does Thomas Markusic beneficially own?

Thomas Markusic beneficially owns 5.2% of Firefly Aerospace Inc.’s Common Stock. This is based on 8,816,520 shares compared with 167,404,645 shares outstanding as of August 6, 2026, adjusted to include his option shares.

How many Firefly Aerospace Inc. (FLY) shares does Thomas Markusic control through options?

Thomas Markusic’s beneficial ownership includes 4,008,701 shares of Firefly Aerospace Common Stock issuable upon exercise of options. These option shares are included in his 8,581,146 shares over which he has sole voting and dispositive power.

What is the total number of Firefly Aerospace Inc. (FLY) shares beneficially owned by Thomas Markusic?

Thomas Markusic beneficially owns a total of 8,816,520 shares of Firefly Aerospace Common Stock. This total combines his directly held shares, option shares, and 235,374 shares owned by his spouse, over which he has shared power.

How many Firefly Aerospace Inc. (FLY) shares does Thomas Markusic hold with sole voting power?

Thomas Markusic has sole voting power over 8,581,146 shares of Firefly Aerospace Common Stock. This consists of 4,807,819 currently outstanding shares and 4,008,701 shares issuable upon exercise of stock options he holds.

How many Firefly Aerospace Inc. (FLY) shares related to Thomas Markusic are owned by his spouse?

Markusic’s spouse owns 235,374 shares of Firefly Aerospace Common Stock. These shares are reported as being subject to Markusic’s shared voting and dispositive power and are included in his total beneficial ownership calculation.

What share count was used to calculate Thomas Markusic’s 5.2% ownership in Firefly Aerospace Inc. (FLY)?

The 5.2% ownership figure is based on 167,404,645 shares of Firefly Aerospace Common Shares outstanding as of August 6, 2026, as reported, and increased by 4,008,701 shares issuable upon exercise of Markusic’s stock options.

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Available on EDGAR 08/14/2026 - 05:00 PM Accepted by SEC EDGAR 08/14/2026 - 04:59 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Firefly Aerospace Inc.

(Name of Issuer)

Common Stock, par value $0.0001

(Title of Class of Securities)

31816X106

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 31816X106

1

Names of Reporting Persons

Markusic Thomas E

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 8,581,146.00
6	Shared Voting Power 235,374.00
7	Sole Dispositive Power 8,581,146.00
8	Shared Dispositive Power 235,374.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

8,816,520.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: In respect of shares with sole beneficially ownership, represents 4,807,819 shares of Common Stock and 4,008,701 shares of Common Stock issuable upon exercise of options to purchase Common Stock. In respect shares with shared beneficial ownership, represents 235,374 shares of Common Stock owned by the spouse of the Reporting Person. Percentage ownership is calculated based on 167,404,645 shares of Common Shares outstanding as of August 6, 2026, as reported on the Issuer's Form 10-Q filed with the SEC on August 11, 2026, as increased by 4,008,701 shares of Common Stock issuable upon exercise of options to purchase Common Stock.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Firefly Aerospace Inc.
(b)	Address of issuer's principal executive offices: 2203 SCOTTSDALE DRIVE, LEANDER, TEXAS, 786416332.
Item 2.
(a)	Name of person filing: Thomas Markusic
(b)	Address or principal business office or, if none, residence: 1320 Arrow Point Drive, Suite 109, Cedar Park, TX 78613
(c)	Citizenship: United States
(d)	Title of class of securities: Common Stock, par value $0.0001
(e)	CUSIP No.: 31816X106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 8,816,520
(b)	Percent of class: 5.2%, which is calculated based on 167,404,645 shares of Common Shares outstanding as of August 6, 2026, as reported on the Issuer's Form 10-Q filed with the SEC on August 11, 2026, as increased by 4,008,701 shares of Common Stock issuable upon exercise of options to purchase Common Stock.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 8,581,146, which represents 4,807,819 shares of Common Stock and 4,008,701 shares of Common Stock issuable upon exercise of options to purchase Common Stock
	(ii) Shared power to vote or to direct the vote: 235,374, which represents shares of Common Stock owned by the spouse of the Reporting Person
	(iii) Sole power to dispose or to direct the disposition of: 8,581,146, which represents 4,807,819 shares of Common Stock and 4,008,701 shares of Common Stock issuable upon exercise of options to purchase Common Stock
	(iv) Shared power to dispose or to direct the disposition of: 235,374, which represents shares of Common Stock owned by the spouse of the Reporting Person
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Markusic Thomas E

Signature:	/s/ Thomas Markusic
Name/Title:	Thomas Markusic
Date:	08/14/2026