[8-K] Castellum, Inc. Reports Material Event

Rhea-AI Filing Summary

Castellum, Inc. (CTM) reported under Item 8.01 that it will attend the 2025 Maxim Growth Summit. The company announced this on October 20, 2025, and attached the full press release as Exhibit 99.1, which is incorporated by reference.

This is a conference participation update. The filing does not include financial results, guidance, or transaction details.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities and Exchange Act of 1934

Date of Report (Date of earliest event reported): October 20, 2025

CASTELLUM, INC.

(Exact name of Registrant as specified in its charter)

Nevada

001-41526

27-4079982

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

1934 Old Gallows Road, Suite 350

Vienna, VA 22182

(Address of principal executive offices, including zip code)

(703) 752-6157

(Registrant’s telephone number, including area code)

Check the appropriate box below if the 8-K filing is intended to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

☐			Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13(c)).

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common stock, par value $0.0001 per share

CTM

NYSE American LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☒

Item 8.01 Other Events

On October 20, 2025, Castellum, Inc. announced that it will attend the 2025 Maxim Growth Summit. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.			Exhibit Title
99.1			Press Release dated October 20, 2025
104			Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

CASTELLUM, INC.

Date: October 21, 2025

By:

/s/ Glen R. Ives

Name:

Glen R. Ives

Title:

Chief Executive Officer (Principal Executive Officer)

FAQ

What did Castellum (CTM) announce in its 8-K?

The company announced it will attend the 2025 Maxim Growth Summit and attached a press release (Exhibit 99.1).

When did Castellum (CTM) make the announcement?

Castellum announced the summit attendance on October 20, 2025.

Does the 8-K include financial results or guidance for CTM?

No. The update pertains to conference participation and does not include financial metrics or guidance.

Which exhibit contains the full details of the announcement?

The full press release is provided as Exhibit 99.1 and is incorporated by reference.

What stock exchange and ticker does Castellum use?

Castellum’s common stock trades on the NYSE American under ticker CTM.

What section of the 8-K covers this update?

The disclosure appears under Item 8.01 – Other Events.