Tammy L. Martin - 01 Jan 2026 Form 3 Insider Report for Castellum, Inc. (CTM)

Role: General Counsel and Secretary
Signature: /s/ Tammy L. Martin
Issuer symbol: CTM
Transactions as of: 01 Jan 2026
Net transactions value: $0
Form type: 3
Filing time: 02 Jan 2026, 16:02:16 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MARTIN TAMMY L	General Counsel and Secretary	1934 OLD GALLOWS ROAD, SUITE 350, VIENNA	/s/ Tammy L. Martin	02 Jan 2026	0001329293

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	CTM	Common Stock						12,500	01 Jan 2026	Direct

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
holding	CTM	Stock Options							01 Jan 2026	Common Stock	12,500	$2.00	Direct	F1
holding	CTM	Stock Options							01 Jan 2026	Common Stock	100,000	$1.07	Direct	F2
holding	CTM	Stock Options							01 Jan 2026	Common Stock	175,000	$1.19	Direct	F3

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

Explanation of Responses:

Id	Content
F1	Ms. Martin holds a total of 12, 500 stock options to purchase 12,500 shares of Common Stock, all of which are exercisable.
F2	Ms. Martin holds a total of 100,000 stock options to purchase 100,000 shares of Common Stock, 50,000 of which vest ratably over thirty-six months commencing February 1, 2025 and 50,000 of which vest ratably over thirty-six months commencing March 1, 2025.
F3	Ms. Martin holds a total of 175,000 stock options to purchase 175,000 shares of Common Stock, which vest ratably over twenty months commencing December 1, 2025.