Castellum (CTM) CEO adds 10,000 shares in open-market stock purchase

Rhea-AI Filing Summary

Castellum, Inc. President and Chief Executive Officer Glen R. Ives reported an open-market purchase of common stock. On March 26, 2026, he bought 10,000 shares of Castellum common stock at $0.6649 per share. Following this transaction, his direct holdings total 197,616 shares of common stock.

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

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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^*

Ives Glen R

(Last) (First) (Middle)

1934 OLD GALLOWS ROAD

SUITE 350

(Street)

VIENNA VIRGINIA 22182

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Castellum, Inc. [ CTM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)	X	Other (specify below)
	President		Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/26/2026

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	03/26/2026		P		10,000	A	$0.6649	197,616	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:

Remarks:

	/s/ Glen R. Ives	03/26/2026
	** 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)

FAQ

What insider transaction did Castellum (CTM) report for Glen R. Ives?

Castellum reported that President and CEO Glen R. Ives made an open-market purchase of the company’s common stock. On March 26, 2026, he bought 10,000 shares at a price of $0.6649 per share, increasing his directly held position.

How many Castellum (CTM) shares did Glen R. Ives buy and at what price?

Glen R. Ives purchased 10,000 shares of Castellum common stock in an open-market transaction. The shares were acquired at a price of $0.6649 per share, as disclosed in the Form 4 insider trading report filed for March 26, 2026.

What are Glen R. Ives’ total Castellum (CTM) holdings after this Form 4 trade?

After the reported transaction, Glen R. Ives directly holds 197,616 shares of Castellum common stock. This total reflects his position immediately following the March 26, 2026 open-market purchase of 10,000 additional shares at $0.6649 per share.

Was the Castellum (CTM) insider trade by Glen R. Ives a purchase or sale?

The transaction reported by Glen R. Ives was a purchase of Castellum common stock. The Form 4 classifies it as an open-market purchase, coded “P,” covering 10,000 shares at $0.6649 per share on March 26, 2026, increasing his direct ownership.

Is Glen R. Ives’ Castellum (CTM) ownership direct or indirect in this filing?

The Form 4 shows Glen R. Ives’ ownership as direct for this transaction. The 10,000 shares purchased on March 26, 2026, and the resulting 197,616 total shares are reported with a direct ownership code, without any indirect holding entity noted.

Does the Form 4 for Castellum (CTM) show any derivative securities for Glen R. Ives?

The Form 4 summary indicates no derivative security transactions for Glen R. Ives in this report. The derivative transaction count and exercise shares are both zero, and the derivative holdings summary is empty, reflecting only the reported common stock purchase.