CTM
Castellum, Inc.Company with tickers: CTM
CIK
1877939
CUSIP
14838T204
Shares Outstanding
94,698,939
13F Activity (30d)
19 filings
19 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 27
Total Value: $4,563,645
Total Shares: 7,735,010
Institutional Ownership Trend
Holder Concentration
Across 27 13F filers · Δ vs Dec 31, 2025Top Holder
39.8%
+13.1 pts
Top 5
75.7%
+4.4 pts
Top 10
91.4%
+4.6 pts
HHI
1,994
Moderately concentrated
+602
Quarterly Activity
vs Dec 31, 2025
New
8
Increased
4
Decreased
5
Sold Out
21
Unchanged
10
Holder count:
-13
Institutional value:
-61.1%
Shares held:
-40.5%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +171,175 | 944,899 | |
| Mid Meridian Wealth Management, LLC | +40,650 | 785,800 | |
| Large Creative Planning | +320 | 20,320 | |
| Large JONES FINANCIAL COMPANIES LLLP | +200 | 6,366 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | −2,001,628 | 153,529 | |
| Large SEI INVESTMENTS CO | −211,497 | 121,574 | |
| Mega JANE STREET GROUP, LLC | −107,068 | 236,774 | |
| Mega NORTHERN TRUST CORP | −28,709 | 181,902 | |
| Mega CITIGROUP INC | −19,791 | 7,040 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 3,081,257 | $1,817,941 | |
| Large CAPTRUST FINANCIAL ADVISORS | 626,100 | $369,399 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 418,324 | $246,811 | |
| Large HRT FINANCIAL LP | 33,836 | $19,963 | |
| Mega Vanguard Global Advisers, LLC | 27,344 | $16,132 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 3,473,227 | $3,136,322 | |
| Small ESSEX INVESTMENT MANAGEMENT CO LLC | 2,114,029 | $1,908,968 | |
| Mid Legato Capital Management LLC | 680,945 | $614,893 | |
| Mega GOLDMAN SACHS GROUP INC | 353,526 | $319,233 | |
| Mid Quadrature Capital Ltd | 217,471 | $196,376 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $1,817,941 | 39.84% | 3,081,257 | Shares | Defined | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $557,490 | 12.22% | 944,899 | Shares | Defined | 2026-05-15 | ||||
| Mid Meridian Wealth Management, LLC | $463,622 | 10.16% | 785,800 | Shares | Sole | 2026-05-06 | ||||
| Large CAPTRUST FINANCIAL ADVISORS | $369,399 | 8.09% | 626,100 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $246,811 | 5.41% | 418,324 | Shares | Defined | 2026-05-08 | ||||
| Mega STATE STREET CORP | $179,301 | 3.93% | 303,900 | Shares | Defined | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $156,636 | 3.43% | 265,486 | Shares | Sole | 2026-05-13 | ||||
| Mega JANE STREET GROUP, LLC | $139,696 | 3.06% | 236,774 | Shares | Defined | 2026-05-12 | ||||
| Mid Savvy Advisors, Inc. | $130,862 | 2.87% | 221,800 | Shares | Sole | 2026-05-11 | ||||
| Mega NORTHERN TRUST CORP Bank | $107,322 | 2.35% | 181,902 | Shares | Defined | 2026-05-14 | ||||
| Mega UBS Group AG | $90,581 | 1.98% | 153,529 | Shares | Defined | 2026-05-05 | ||||
| Large SEI INVESTMENTS CO | $71,728 | 1.57% | 121,574 | Shares | Sole | 2026-05-13 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $55,928 | 1.23% | 94,794 | Shares | Sole | 2026-05-15 | ||||
| Small Almanack Investment Partners, LLC. | $29,500 | 0.65% | 50,000 | Shares | Sole | 2026-05-05 | ||||
| Large HRT FINANCIAL LP | $19,963 | 0.44% | 33,836 | Shares | Defined | 2026-05-14 | ||||
| Large Pathstone Holdings, LLC | $18,395 | 0.40% | 31,179 | Shares | Sole | 2026-05-11 | ||||
| Mega Vanguard Global Advisers, LLC | $16,132 | 0.35% | 27,344 | Shares | Defined | 2026-05-08 | ||||
| Mid KESTRA PRIVATE WEALTH SERVICES, LLC | $16,077 | 0.35% | 27,250 | Shares | Sole | 2026-04-20 | ||||
| Mid CAPITAL ADVISORS INC/OK | $12,980 | 0.28% | 22,000 | Shares | Sole | 2026-04-27 | ||||
| Micro Ground Swell Capital, LLC | $12,443 | 0.27% | 21,090 | Shares | Sole | 2026-04-21 | ||||
| Large Creative Planning | $11,988 | 0.26% | 20,320 | Shares | Sole | 2026-05-12 | ||||
| Small TWO SIGMA SECURITIES, LLC Broker-Dealer | $8,980 | 0.20% | 15,222 | Shares | Sole | 2026-05-15 | ||||
| Mid Blue Trust, Inc. | $8,687 | 0.19% | 14,724 | Shares | Sole | 2026-04-20 | ||||
| Small Inscription Capital, LLC | $7,375 | 0.16% | 12,500 | Shares | Sole | 2026-04-20 | ||||
| Mid Welch Group, LLC | $5,900 | 0.13% | 10,000 | Shares | Sole | 2026-04-21 | ||||
| Mega CITIGROUP INC | $4,153 | 0.09% | 7,040 | Shares | Defined | 2026-05-11 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $3,755 | 0.08% | 6,366 | Shares | Sole | 2026-05-15 | ||||
| No holders match your search. | ||||||||||