Castellum Inc.
Ownership
Ownership Structure
Who owns Castellum Inc. (CTM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.6% of the shares are freely tradable; institutional investors hold 8.2%.
Largest Shareholders
No ownership data is available for this stock yet.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Merriman Andrew | Chief Operating Officer | 588,531 | 361,711 $ | Sep 9, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 9, 2026 | Merriman Andrew | Chief Operating Officer | Buy | 10,000 | 0.62 | 6,200 |
| Sep 9, 2026 | Merriman Andrew | Chief Operating Officer | Buy | 40,000 | 0.6193 | 24,772 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.