Castellum, Inc.
CTM- Exchange
- NYSE
- Industry
- Services-Management Consulting Services
- SEC CIK
- 0001877939
In the last 90 days, Castellum, Inc. insiders filed 5 open-market purchases and 0 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $5.69M in total; no superinvestor holds it.
Q4 2025 vs. Q3 2025
How the institutions holding Castellum, Inc. changed between Q3 2025 and Q4 2025.
All holders in Q4 2025All holders in Q3 2025
| Measure | Q3 2025 | Of which not filed for Q4 2025 | Q4 2025 | Change |
|---|---|---|---|---|
| Holders | 42 | 2 | 40 | 0 |
| Shares | 8.51M | 26.6K | 13.0M | +4.51M (+53.2%) |
| Value | $9.27M | $29.0K | $11.7M | +$2.49M (+27.0%) |
2 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.
New holders (8)
Institutions that held Castellum, Inc. at the end of Q4 2025 but not at the end of Q3 2025.
| Institution | Shares | Value | % of portfolio |
|---|---|---|---|
| SEI Investments Co | 333,071 | $300.8K | 0.00% |
| Inspire Advisors, LLC | 41,700 | $37.7K | 0.00% |
| Point72 Asset Management, L.P. | 34,668 | $31.3K | 0.00% |
| Squarepoint Ops LLC | 26,781 | $24.2K | 0.00% |
| Royal Bank of Canada | 22,000 | $20.0K | 0.00% |
| Virtu Financial LLC | 16,804 | $15.0K | 0.00% |
| Welch Group, LLC | 10,000 | $9.03K | 0.00% |
| Strengthening Families & Communities, LLC | 3,000 | $2.71K | 0.00% |
Sold out (8)
Institutions that held Castellum, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| XTX Topco Ltd | 204,717 | $223.1K |
| Morgan Stanley | 73,714 | $80.3K |
| Two Sigma Securities, LLC | 25,739 | $28.1K |
| TCFG Wealth Management, LLC | 15,596 | $17.0K |
| GK Wealth Management LLC | 15,204 | $16.6K |
| Bay Colony Advisory Group, Inc d/b/a Bay Colony Advisors | 12,630 | $13.8K |
| New Century Financial Group, LLC | 12,000 | $13.1K |
| JPMorgan Chase & Co | 31 | $34 |
Not filed for Q4 2025 yet (2)
Institutions that held Castellum, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| Cubist Systematic Strategies, LLC | 26,266 | $28.6K |
| Point72 (DIFC) Ltd | 309 | $337 |