Castellum, Inc.

Overview

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• TickerCTM on NYSE¹
• IndustryServices-Management Consulting Services¹
• HeadquartersVienna, Virginia¹
• Incorporated inNV²
• Business address1934 Old Gallows Road, Suite 350, Vienna, Va 22182²
• Filer category, Emerging growth company²
• Legal formCorporation

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Castellum is focused on building a large, successful technology services, solutions, and products company in the areas of cybersecurity, IT, electronic warfare, information warfare, system modernization, and information operations with businesses in the defense, federal, civilian, and commercial markets. Services include intelligence analysis, software development, software engineering, program management, strategic and mission planning, information assurance, cybersecurity and policy support, data analytics, and model based systems engineering (“MBSE”). These services are applicable to customers in the United States (“U.S.”) government (“USG”), financial services, legal, and other users of large data applications. They can be delivered to on-premises enclaves or customers who rely upon cloud-based infrastructures. The Company routinely works with multiple business brokers and contacts w…⁴ From its latest annual report

Corporate structure

Castellum, Inc. sits at the top of its group. 5 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

What it owns

What Castellum, Inc. reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Property and equipment

Investments

Intangibles and goodwill

Properties, in its own words

Our principal executive offices are located at 1934 Old Gallows Road, Suite 350, Vienna, Virginia 22182 in a shared office space leased from Intelligent Office. As of December 31, 2025, our subsidiaries lease property at the following locations:

● · Augusta, Georgia

Item 2 of the 10-K filed Mar 9, 2026.⁴

Leadership

Who has led Castellum, Inc., and when. Pick a name to see everywhere that person has worked.

• Chief executive officerMark C. Fuller Oct 12, 2022 to Jun 14, 2023¹¹
• ChairMark C. Fuller Oct 12, 2022 to Oct 12, 2022¹¹
• PresidentGlen R. Ives Jul 3, 2024 to now¹²
• PresidentMark C. Fuller Mar 24, 2023 to Jun 14, 2023¹³
• Chief financial officerDavid T. Bell Oct 12, 2022 to now¹⁴
• Chief operating officerAndrew Merriman Sep 4, 2024 to now¹⁵
• Chief operating officerGlen R. Ives Oct 12, 2022 to Apr 3, 2023¹⁶

Subsidiaries and ownership

Subsidiaries (Exhibit 21)

• Castellum Advanced Technology Products, Inc. Nevada³
• Corvus Consulting, LLC (“Corvus”) Virginia³
• Global Technology and Management Resources, Inc. (“GTMR”) Maryland³
• Specialty Systems, Inc. (“SSI”) New Jersey³

The subsidiaries the company lists in Exhibit 21 of its annual report, as filed.

Timeline

1. Oct 13, 20268-K Other events²⁷
2. Sep 9, 20268-K Other events²⁸
3. Aug 31, 20268-K Other events²⁹
4. Aug 7, 20268-K Results of operations³⁰
5. Jul 31, 20268-K Other events³¹
6. Jul 2, 20268-K Entered a material agreement; Executive or director change³²
7. Jun 24, 20268-K Other events³³
8. Jun 15, 20268-K Other events³⁴
9. May 20, 20268-K Shareholder vote³⁵
10. May 18, 20268-K Regulation FD disclosure³⁶
11. May 13, 20268-K Results of operations; Regulation FD disclosure³⁷
12. Apr 23, 20268-K Other events³⁸
13. Oct 12, 2022New chief executive Mark C. Fuller becomes CEO¹¹

Calendar

Coming up

1. Nov 6, 2026Reports results for the quarter ending Sep/2026³⁹

When it reported results

1. Aug 7, 2026Reported quarterly or annual results³⁰
2. May 13, 2026Reported quarterly or annual results³⁷
3. Mar 5, 2026Reported quarterly or annual results⁴⁰
4. Nov 7, 2025Reported quarterly or annual results⁴¹
5. Aug 8, 2025Reported quarterly or annual results⁴²
6. May 9, 2025Reported quarterly or annual results⁴³
7. Feb 28, 2025Reported quarterly or annual results⁴⁴
8. Nov 4, 2024Reported quarterly or annual results⁴⁵

Upcoming dates from Nasdaq's calendar; past results from the company's 8-K filings (Item 2.02). The full markets calendar

Filings

309 filings to the SEC since October 2021: 4 annual reports, 12 quarterly reports, 99 major events, 125 insider forms, 3 large holders, 1 private raises, 65 other. The latest 20:

1. Oct 13, 20268-K EDGAR
2. Oct 1, 20264 EDGAR
3. Oct 1, 20264 EDGAR
4. Oct 1, 20264 EDGAR
5. Oct 1, 20264 EDGAR
6. Sep 9, 20264 EDGAR
7. Sep 9, 20268-K EDGAR
8. Aug 31, 20268-K EDGAR
9. Aug 7, 20268-K EDGAR
10. Aug 6, 202610-Q EDGAR
11. Jul 31, 20268-K EDGAR
12. Jul 2, 20264 EDGAR
13. Jul 2, 20264 EDGAR
14. Jul 2, 20264 EDGAR
15. Jul 2, 20264 EDGAR
16. Jul 2, 20268-K EDGAR
17. Jun 24, 20268-K EDGAR
18. Jun 15, 20268-K EDGAR
19. Jun 1, 2026S-8 EDGAR
20. May 20, 20268-K EDGAR

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Insider trades

99 open-market trades by officers, directors and large owners since October 2021: 53 buys and 46 sales. Grants, option exercises and gifts are left out.

From Forms 4 filed with the SEC.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

• Crom Cortana Fund LLCSC 13G, 1 filing Feb 23, 2023⁴⁶
• Jay O. WrightSC 13D, 1 filing Oct 24, 2022⁴⁷
• Mark C. FullerSC 13D, 1 filing Oct 24, 2022⁴⁸

Executive pay

What the company paid its top executives, from the summary compensation table in its proxy statement. Total pay includes salary, bonus, stock and option awards and other pay, as the company valued them.

Money raised

Private offerings the company reported to the SEC on Form D.

1. Jul 19, 2021Raised $520,000 in a private offering of equity Form D: $10 million offered in all Form D

Held by these funds

The largest holders among investment managers' 13F reports for the quarter ending Jun 30, 2026, the top 25 of 35. Change is in shares since the quarter before.

13F reports cover disclosed long positions in U.S. stocks only.

SEC filer profile

How Castellum, Inc. is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

• Name on EDGARCastellum, Inc.¹
• CIK0001877939
• Employer ID (EIN)27-4079982⁴
• Filer statusNon-accelerated filer an emerging growth company; a smaller reporting company; not a shell company⁴
• Incorporated inNevada⁴
• Fiscal year endsDecember 31¹
• Industry code (SIC)8742 Services-Management Consulting Services¹
• SEC reviewing officeOffice of Trade & Services, Division of Corporation Finance¹
• Business address1934 Old Gallows Road, Suite 350, Vienna, VA 22182¹
• Phone(703) 752-6157¹
• Shares outstanding94,781,286 as of Aug 5, 2026¹⁰
• Public float$97.9M as of Jun 30, 2025⁴
• AuditorRSM US LLP, McLean, Virginia PCAOB ID 49; no auditor attestation of internal control over financial reporting⁴
• On EDGAR sinceOct 19, 2021¹
• Filings309 in all: 4 (100), 8-K (98), 3 (13), 10-Q (12), 4/A (10), CORRESP (10), 424B5 (8), 144 (7)¹
  All 33 form types

  UPLOAD (6), 10-K (4), DEF 14A (4), DEFA14A (4), EFFECT (4), S-1/A (4), S-3 (3), S-8 (3), 424B4 (2), SC 13D (2), 3/A (1), 424B2 (1), 5 (1), 8-A12B (1), 8-K/A (1), CERT (1), D (1), DEF 14C (1), DRS (1), DRS/A (1), DRSLTR (1), PRE 14C (1), S-1 (1), S-3/A (1), SC 13G (1)

• Latest filingsAnnual report (10-K) Mar 9, 2026
  Quarterly report (10-Q) Aug 6, 2026
  Proxy statement (DEF 14A) Apr 7, 2026
  Latest 8-K (8-K) Oct 13, 2026

Securities registered for trading

From the cover page of the 10-K filed Mar 9, 2026 (Section 12(b) of the Exchange Act).⁴

Risk factors and legal proceedings

The risks Castellum, Inc. names in Item 1A of its 10-K filed Mar 9, 2026: 39 risks under these headings, as written.⁴

• Risks Related to our Business, Industry and Operations
• We lack a long-term operating history on which to evaluate our consolidated business and determine if we will be able to execute our business plan, and we can give no assurance that our operations will result in sustained profitability.
• We have historically suffered net losses, and we may not be able to sustain profitability.
• We rely upon a few, select key employees who are instrumental to our ability to conduct and grow our business. In the event any of those key employees would no longer be affiliated with the Company, and we did not replace them with equally capable replacements, it may have a material detrimental impact on our ability to successfully operate our business.
• We may have difficulty raising additional capital, which could deprive us of necessary resources.
• You may experience dilution, subordination of stockholder rights, preferences, and privileges, and decrease in market price of our common stock as a result of our financing efforts.
• Failure to effectively manage any future growth could place strains on our managerial, operational, and financial resources and could adversely affect our business and operating results.
• We generate substantially all of our revenue from contracts with the U.S. federal, state, and local governments which are subject to a number of challenges and risks that may adversely impact our business, prospects, financial condition, and operating results.
• We operate in an industry that is highly regulated and unexpected changes in laws could have a significant adverse impact on our business.
• USG contracts contain numerous provisions that are unfavorable to us.
• If we are unable to maintain successful relationships with our teaming partners, our ability to market, sell, and distribute our services will be limited, and our business, financial position, and results of operations will be harmed.
• We are exposed to the credit risk of some of our teaming partners, which could result in material losses.

Legal proceedings

As a commercial enterprise and employer, the Company and our subsidiaries are subject to threatened litigation and other legal actions in the ordinary course of business, including employee-related matters, inquiries, and administrative proceedings regarding our employment practices or other matters. Neither our Company nor any of our subsidiaries is a party to any legal proceeding that, individually or in the aggregate, we believe to be uncovered by insurance or otherwise material to our Company as a whole.

The opening of Item 3, Legal Proceedings.⁴