Mark C. Fuller - Sep 3, 2025 Form 4 Insider Report for Castellum, Inc. (CTM)

Role
Former Officer and Affiliate
Signature
/s/ Mark C. Fuller
Stock symbol
CTM
Transactions as of
Sep 3, 2025
Transactions value $
-$560,000
Form type
4
Date filed
9/3/2025, 05:06 PM
Previous filing
May 20, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Fuller Mark C Former Officer and Affiliate 1934 OLD GALLOWS ROAD, SUITE 350, VIENNA /s/ Mark C. Fuller 2025-09-03 0001944544

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CTM Common Stock Sale -$560K -500K -7.56% $1.12 6.11M Sep 3, 2025 Direct F1, F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Mark C. Fuller is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
F1 Includes (a) 6,047,519 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.
F2 Effective May 28, 2025, Mr. Fuller ceased to be a member of the Company's board of directors.
F3 Effective June 12, 2025, Mr. Fuller ceased to be an affiliate of the Company.