CASTELLUM INC CTM
COM NEW · Common Stock · CUSIP 14838T204
- SectorIndustrials
- IndustryServices-Management Consulting Services
- HeadquartersVienna, VA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 93.0m as of 2025-08-07, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $1.05.
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q4 2022 | 14 |
| Q1 2023 | 15 |
| Q2 2023 | 18 |
| Q3 2023 | 18 |
| Q4 2023 | 21 |
| Q1 2024 | 22 |
| Q2 2024 | 22 |
| Q3 2024 | 18 |
| Q4 2024 | 21 |
| Q1 2025 | 26 |
| Q2 2025 | 34 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 8 | 7 |
| Q4 2023 | 10 | 4 |
| Q1 2024 | 10 | 5 |
| Q2 2024 | 10 | 9 |
| Q3 2024 | 6 | 9 |
| Q4 2024 | 8 | 7 |
| Q1 2025 | 16 | 11 |
| Q2 2025 | 21 | 8 |
Biggest buyers
| ESSEX INVESTMENT MANAGEMENT CO LLC | New | +2.1m |
| Legato Capital Management LLC | New | +621.4k |
| VANGUARD GROUP INC | Added | +412.4k |
| JANE STREET GROUP, LLC | New | +194.7k |
| Savvy Advisors, Inc. | New | +191.1k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +180.7k |
| Virtu Financial LLC | Added | +86.0k |
| XTX Topco Ltd | Added | +70.4k |
| HRT FINANCIAL LP | New | +50.4k |
| Meridian Wealth Management, LLC | Added | +36.0k |
Biggest sellers
| Inscription Capital, LLC | Reduced | -237.5k |
| Bank of New York Mellon Corp | Reduced | -100.0k |
| TOWNSQUARE CAPITAL LLC | Sold out | -44.8k |
| Tower Research Capital LLC (TRC) | Sold out | -39.0k |
| MML INVESTORS SERVICES, LLC | Sold out | -27.9k |
| TWO SIGMA SECURITIES, LLC | Sold out | -17.2k |
| Westside Investment Management, Inc. | Sold out | -680 |
| American Capital Advisory, LLC | Sold out | -342 |
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 1 | $22.4k | 0 | — | — |
| Q3 2024 | 1 | $92.8k | 0 | — | — |
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 2 | $1.4m | — |
| Q2 2025 | 0 | — | 2 | $802.6k | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-05-19 | Fuller Mark C Director | Sold | $525.0k500.0k shares |
| 2025-05-19 | WRIGHT JAY O General Counsel, Secretary, director | Sold | $277.6k259.4k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| ESSEX INVESTMENT MANAGEMENT CO LLC 0.40% of their portfolio | 2.1m $2.2m | New |
| VANGUARD GROUP INC 0.00% of their portfolio | 1.1m $1.1m | Added +412.4k |
| Legato Capital Management LLC 0.08% of their portfolio | 621.4k $652.5k | New |
| Meridian Wealth Management, LLC 0.03% of their portfolio | 616.8k $647.6k | Added +36.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 599.2k $629.3k | Added +180.7k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 500.0k $525.0k | Reduced -100.0k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 194.7k $204.5k | New |
| Savvy Advisors, Inc. 0.01% of their portfolio | 191.1k $200.7k | New |
| STATE STREET CORP 0.00% of their portfolio | 156.0k $163.8k | Unchanged |
| XTX Topco Ltd 0.01% of their portfolio | 135.8k $142.6k | Added +70.4k |
| BlackRock, Inc. 0.00% of their portfolio | 127.4k $133.8k | Unchanged |
| Virtu Financial LLC 0.01% of their portfolio | 105.1k $110.0k | Added +86.0k |
| Cubist Systematic Strategies, LLC 0.00% of their portfolio | 94.2k $98.9k | Added +26.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 94.1k $98.8k | Unchanged |
| HRT FINANCIAL LP 0.00% of their portfolio | 50.4k $52.0k | New |
| Almanack Investment Partners, LLC. 0.01% of their portfolio | 50.0k $52.5k | Unchanged |
| PKS Advisory Services, LLC 0.01% of their portfolio | 42.2k $44.3k | Unchanged |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 33.0k $34.6k | New |
| CITIGROUP INC 0.00% of their portfolio | 31.6k $33.2k | New |
| KESTRA PRIVATE WEALTH SERVICES, LLC 0.00% of their portfolio | 27.2k $28.6k | Unchanged |
| Squarepoint Ops LLC 0.00% of their portfolio | 23.9k $25.1k | New |
| Quadrature Capital Ltd 0.00% of their portfolio | 21.1k $22.2k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 17.7k $18.6k | Added +19 |
| Pathstone Holdings, LLC 0.00% of their portfolio | 15.6k $16.4k | New |
| Blue Trust, Inc. 0.00% of their portfolio | 14.7k $15.5k | Unchanged |
| Inscription Capital, LLC 0.00% of their portfolio | 12.5k $13.1k | Reduced -237.5k |
| New Century Financial Group, LLC 0.01% of their portfolio | 12.0k $12.6k | New |
| Creative Planning 0.00% of their portfolio | 10.0k $10.5k | Unchanged |
| Global Retirement Partners, LLC 0.00% of their portfolio | 4.8k $5.1k | First filing |
| Sunbelt Securities, Inc. 0.00% of their portfolio | 3.0k $6.0k | New |
| Strengthening Families & Communities, LLC 0.00% of their portfolio | 2.7k $2.9k | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 589 $619 | Added +224 |
| UBS Group AG 0.00% of their portfolio | 76 $80 | Unchanged |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio | 0 $0 | Unchanged |