C. Thomas McMillen - 11 Nov 2025 Form 4 Insider Report for Castellum, Inc. (CTM)

Role: Director
Signature: /s/ C. Thomas McMillen
Issuer symbol: CTM
Transactions as of: 11 Nov 2025
Net transactions value: $0
Form type: 4
Filing time: 13 Nov 2025, 06:52:12 UTC
Previous filing: 21 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
McMillen Charles Thomas	Director	1103 SOUTH CAROLINA AVENUE, WASHINGTON	/s/ C. Thomas McMillen	13 Nov 2025	0001332108

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CTM	Stock Options	Award	$0	+100,000		$0.000000	100,000	11 Nov 2025	Common Stock	100,000	$1.19	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	As compensation for his service as an independent member of the Board of Directors, Mr. McMillen received 100,000 stock options granted pursuant to the terms of the Castellum, Inc. Second Amended 2021 Stock Incentive Plan to purchase 100,000 shares of common stock which vest ratably over a period of twenty months commencing December 1, 2025.