Mark C. Fuller
CEO, President at Castellum Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Castellum Inc., 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Castellum Inc. May 29, 202489.9%
-
Castellum Inc. May 24, 202396.6%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Sep 3, 2025 | Castellum Inc. | Open-market sale | −500,000 | $1.12 | $560,000 |
| May 19, 2025 | Castellum Inc. | Open-market sale | −500,000 | $1.05 | $525,000 |
| Mar 6, 2025 | Castellum Inc. | Open-market sale | −225,000 | $1.33 | $299,250 |
| Mar 5, 2025 | Castellum Inc. | Other | −50,000 | — | — |
| Mar 5, 2025 | Castellum Inc. | Open-market sale | −275,000 | $1.49 | $409,750 |
| Jun 13, 2023 | Castellum Inc. | Open-market purchase | +1,000 | $0.65 | $650 |
Questions about Mark C. Fuller
What boards is Mark C. Fuller on?
Mark C. Fuller sits on the board of Castellum Inc.
What company is Mark C. Fuller the CEO of?
Mark C. Fuller is CEO, President of Castellum Inc.
How long has Mark C. Fuller served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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