Castellum, Inc. — Director's Dealing 2025

Mar 6, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Castellum, Inc. (CTM)
CIK: 0001877939
Period of Report: 2025-03-05

Reporting Person: Fuller Mark C (Director, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-03-05	Common Stock	J	50000	—	Disposed	7613659	Direct
2025-03-05	Common Stock	S	275000	$1.493	Disposed	7338659	Direct
2025-03-06	Common Stock	S	225000	$1.332	Disposed	7113659	Direct

Footnotes

F1: Removes 50,000 shares of common stock previously reported on Form 4 on June 14, 2023 which is owned by Reporting Person's children who are now adults.

F2: Includes (a) 7,547,519 common shares held by The Mark Chappelle Fuller Revocable Trust, Mark Fuller, TTEE, (b) 50,000 common shares held by Janice Lynn Dudley Revocable Trust, Janice Lynn Dudley TTEE, and (c) 16,140 shares held by Mark C. Fuller.

F3: Includes (a) 7,272,519 common shares held by The Mark Chappelle Fuller Revocable Trust, Mark Fuller, TTEE, (b) 50,000 common shares held by Janice Lynn Dudley Revocable Trust, Janice Lynn Dudley TTEE, and (c) 16,140 common shares held by Mark C. Fuller.

F4: Includes (a) 7,047,519 common shares held by The Mark Chappelle Fuller Revocable Trust, Mark Fuller, TTEE, (b) 50,000 common shares held by Janice Lynn Dudley Revocable Trust, Janice Lynn Dudley TTEE, and (c) 16,140 common shares held by Mark Fuller.