Tammy L. Martin - 01 Oct 2026 Form 4 Insider Report for Castellum, Inc. (CTM)

Reporting relationship: General Counsel and Secretary
Issuer ticker: CTM
Reported as of: 01 Oct 2026
Net transaction value: +$747
SEC form: 4
Accepted by SEC: 01 Oct 2026, 16:09:45 UTC
Prior SEC filing: 02 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Tammy L. Martin

Key filing fact

Tammy L. Martin filed Form 4 for Castellum, Inc. (CTM) on 01 Oct 2026.

Key facts

This page summarizes Tammy L. Martin's Form 4 filing for Castellum, Inc. (CTM).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 01 Oct 2026, 16:09.

Change

Previous filing in this sequence was filed on 02 Jul 2026.
Current net transaction value: +$747.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001329293 Primary reporting owner

MARTIN TAMMY L

Relationship: General Counsel and Secretary
Address: 1934 OLD GALLOWS ROAD, SUITE 350, VIENNA
Signature: /s/ Tammy L. Martin
Signature date: 01 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CTM transaction

Common Stock

Purchase

Transaction value: $747
Shares: +1,396
Change %: +9.3%
Price: $0.5352
Shares after: 16,427
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Pursuant to the terms of the Castellum, Inc. 2025 Employee Stock Purchase Plan, the reporting person purchased 1,396 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 September 30, 2026.