46 institutions reported holding $4.6M of CASTELLUM INC C (CTM) in SEC 13F filings for 2026-03-31. Largest institutional holders: VANGUARD CAPITAL MANAGEMENT LLC ($1.8M), GEODE CAPITAL MANAGEMENT, LLC ($557,149), Meridian Wealth Management, LLC ($463,229), CAPTRUST FINANCIAL ADVISORS ($369,086), VANGUARD FIDUCIARY TRUST CO ($246,811). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | $1.8M | 3.1M | New |
| 2 | GEODE CAPITAL MANAGEMENT, LLC | $557,149 | 944,899 | Added |
| 3 | Meridian Wealth Management, LLC | $463,229 | 785,800 | Added |
| 4 | CAPTRUST FINANCIAL ADVISORS | $369,086 | 626,100 | New |
| 5 | VANGUARD FIDUCIARY TRUST CO | $246,811 | 418,324 | New |
| 6 | STATE STREET CORP | $179,149 | 303,900 | Hold |
| 7 | BlackRock, Inc. | $156,504 | 265,486 | Hold |
| 8 | JANE STREET GROUP, LLC | $139,578 | 236,774 | Trimmed |
| 9 | Savvy Advisors, Inc. | $130,751 | 221,800 | Hold |
| 10 | NORTHERN TRUST CORP | $107,231 | 181,902 | Trimmed |
| 11 | UBS Group AG | $90,582 | 153,529 | Trimmed |
| 12 | SEI INVESTMENTS CO | $71,668 | 121,574 | Trimmed |
| 13 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $55,881 | 94,794 | Hold |
| 14 | Almanack Investment Partners, LLC. | $29,475 | 50,000 | Hold |
| 15 | HRT FINANCIAL LP | $19,000 | 33,836 | New |
| 16 | Pathstone Holdings, LLC | $18,380 | 31,179 | Hold |
| 17 | Vanguard Global Advisers, LLC | $16,133 | 27,344 | New |
| 18 | KESTRA PRIVATE WEALTH SERVICES, LLC | $16,064 | 27,250 | Hold |
| 19 | CAPITAL ADVISORS INC/OK | $12,969 | 22,000 | New |
| 20 | Ground Swell Capital, LLC | $12,433 | 21,090 | New |
| 21 | Creative Planning | $11,979 | 20,320 | Added |
| 22 | TWO SIGMA SECURITIES, LLC | $8,973 | 15,222 | New |
| 23 | Blue Trust, Inc. | $8,680 | 14,724 | Hold |
| 24 | Inscription Capital, LLC | $7,369 | 12,500 | Hold |
| 25 | Welch Group, LLC | $5,895 | 10,000 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31