Castellum COO buys 1,202 shares in stock plan

Castellum, Inc. Chief Operating Officer Andrew Merriman reported an open-market purchase of 1,202 shares of common stock.

Rhea-AI Filing Summary

Castellum, Inc. Chief Operating Officer Andrew Merriman reported an open-market purchase of 1,202 shares of common stock. The transaction occurred on July 1, 2026 at a per share price of $0.612. After this purchase, he directly owns 538,531 shares of Castellum common stock.

The shares were acquired through the Castellum, Inc. 2025 Employee Stock Purchase Plan, with the purchase price set at a 15% discount to the closing price of Castellum’s stock on the NYSE American LLC on June 30, 2026.

Insider Trade Summary

Net Buyer: 1,202 shares

Net Buy 1 txn

Insider Merriman Andrew

Role Chief Operating 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 — 538,531 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Shares purchased: 1,202 shares Purchase price: $0.612 per share Post-transaction holdings: 538,531 shares +1 more

4 metrics

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

Purchase price $0.612 per share Price for 1,202 shares acquired

Post-transaction holdings 538,531 shares Direct ownership after the purchase

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

Key Terms

2025 Employee Stock Purchase Plan, per share purchase price, NYSE American LLC

3 terms

2025 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"

per share purchase price financial

"The per share purchase price was calculated at a discount of fifteen percent"

The per share purchase price is the amount of money paid to buy each individual share of a company's stock. It helps investors understand how much they are paying for a single unit of ownership in the company. This figure is important because it influences investment decisions and reflects the value placed on the company at the time of purchase.

NYSE American LLC financial

"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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Castellum (CTM) COO Andrew Merriman report in this Form 4?

Andrew Merriman reported buying 1,202 Castellum common shares. The purchase was made on July 1, 2026 at $0.612 per share under the 2025 Employee Stock Purchase Plan, increasing his direct holdings to 538,531 shares.

At what price did Castellum COO Andrew Merriman buy the 1,202 CTM shares?

He purchased the 1,202 Castellum shares at $0.612 per share. The price was set under the 2025 Employee Stock Purchase Plan at a 15% discount to the June 30, 2026 NYSE American closing price.

How many Castellum (CTM) shares does Andrew Merriman own after this transaction?

After the reported purchase, Andrew Merriman directly owns 538,531 shares of Castellum common stock. This reflects his position following the acquisition of 1,202 shares on July 1, 2026 through the company’s 2025 Employee Stock Purchase Plan.

Was the Castellum COO’s Form 4 transaction part of an employee stock purchase plan?

Yes. The 1,202 shares were bought under Castellum’s 2025 Employee Stock Purchase Plan. The plan allowed Merriman to purchase common stock at a 15% discount to the June 30, 2026 NYSE American closing price.

Is Andrew Merriman’s Castellum (CTM) share purchase an open-market transaction?

The transaction is coded as an open-market or private purchase of common stock. According to the filing, the shares were acquired through the 2025 Employee Stock Purchase Plan, which set the discounted purchase price based on the June 30, 2026 market close.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/02/2026 - 04:07 PM EDT 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^*

Merriman Andrew

(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)		Other (specify below)
	Chief Operating Officer

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)	538,531	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/ Andrew Merriman	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)