Castellum (CTM) CFO adds 1,202 shares via discounted stock purchase plan

Rhea-AI Filing Summary

Castellum, Inc. Chief Financial Officer and Treasurer David T. Bell reported an open-market purchase of common stock. He acquired 1,202 shares on July 1, 2026 at a price of $0.612 per share, increasing his direct holdings to 17,255 shares.

According to the company’s 2025 Employee Stock Purchase Plan, the shares were bought at a 15% discount to the closing price of Castellum’s common stock on the NYSE American on June 30, 2026, making this a plan-based accumulation of additional equity.

Insider Trade Summary

Net Buyer: 1,202 shares ($736)

Net Buy 1 txn

Insider Bell David T

Role Chief Financial Officer

Bought 1,202 shs ($735.62)

Type	Security	Shares	Price	Value
Purchase	Common Stock	1,202	$0.612	$735.62

Holdings After Transaction: Common Stock — 17,255 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares purchased: 1,202 shares Purchase price: $0.612 per share Total holdings after purchase: 17,255 shares +1 more

4 metrics

Shares purchased 1,202 shares Common stock bought on July 1, 2026

Purchase price $0.612 per share Price paid for common stock

Total holdings after purchase 17,255 shares Direct ownership following transaction

Plan discount 15% Discount to June 30, 2026 NYSE American closing price

Key Terms

Employee Stock Purchase Plan, open-market purchase, NYSE American LLC

3 terms

Employee Stock Purchase Plan financial

"Pursuant to the terms of the Castellum, Inc. 2025 Employee Stock Purchase Plan, the reporting person purchased 1,202 shares"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

NYSE American LLC market

"closing price of the Registrant's common stock as quoted on the NYSE American LLC on June 30, 2026"

NYSE American LLC is a U.S. securities exchange where shares and certain options are listed and traded, with a focus on smaller and mid-sized companies and specific listing rules and trading features. For investors, the exchange matters because it shapes how easily a stock can be bought or sold, the pool of buyers and sellers and the transparency and oversight around trading—like a marketplace that sets the stalls, hours and quality checks that affect liquidity and risk.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 04:08 PM Accepted by SEC EDGAR 07/02/2026 - 04:06 PM Learn about SEC filing dates

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^*

Bell David T

(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)
	Chief Financial Officer		Treasurer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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	07/01/2026		P		1,202	A	$0.612(1)	17,255	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. Pursuant to the terms of the Castellum, Inc. 2025 Employee Stock Purchase Plan, the reporting person purchased 1,202 shares of common stock of the Registrant. The per share purchase price was calculated at a discount of fifteen percent to the closing price of the Registrant's common stock as quoted on the NYSE American LLC on June 30, 2026.

Remarks:

	/s/ David T. Bell	07/02/2026
	** 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 in this Form 4?

Castellum’s Chief Financial Officer David T. Bell bought 1,202 shares of common stock. The shares were acquired through the 2025 Employee Stock Purchase Plan, representing a routine, plan-based increase in his personal equity stake in the company.

At what price did the Castellum (CTM) CFO purchase shares on this Form 4?

The CFO purchased 1,202 Castellum common shares at approximately $0.612 per share. This per-share price reflects a discounted rate under the 2025 Employee Stock Purchase Plan, tied to the NYSE American closing price on June 30, 2026.

How many Castellum (CTM) shares does the CFO hold after this Form 4 transaction?

After buying 1,202 shares, the Castellum CFO directly holds 17,255 common shares. This updated holding reflects only his direct ownership reported in the Form 4 and does not include any additional derivative or indirect positions in this filing.

Was the Castellum (CTM) insider purchase part of an Employee Stock Purchase Plan?

Yes. The filing states the 1,202 Castellum shares were purchased under the 2025 Employee Stock Purchase Plan. The plan allowed the CFO to buy stock at a 15% discount to the June 30, 2026 NYSE American closing price.

Does this Castellum (CTM) Form 4 involve any stock options or derivatives?

No derivative securities are shown in this Form 4. The transaction summary reports only a non-derivative open-market style purchase of common stock, and the derivative section of the filing contains no remaining option or warrant positions.