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. 87.9% 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 | 589,927 | 286,115 $ | Oct 1, 2026 | direct |
| Ives Glen R | President | 202,578 | 98,250 $ | Oct 1, 2026 | direct |
| Bell David T | Chief Financial Officer | 18,651 | 9,046 $ | Oct 1, 2026 | direct |
| Martin Tammy L | General Counsel and Secretary | 16,427 | 7,967 $ | Oct 1, 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 |
|---|---|---|---|---|---|---|
| Oct 1, 2026 | Martin Tammy L | General Counsel and Secretary | Buy | 1,396 | 0.5352 | 747 |
| Oct 1, 2026 | Bell David T | Chief Financial Officer | Buy | 1,396 | 0.5352 | 747 |
| Oct 1, 2026 | Merriman Andrew | Chief Operating Officer | Buy | 1,396 | 0.5352 | 747 |
| Oct 1, 2026 | Ives Glen R | President | Buy | 1,700 | 0.5352 | 910 |
| 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: October 30, 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.