Who owns Castellum, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of CTM from SEC Form 13F filings across 35 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 35 institutions disclosed 7.9M shares of Castellum, Inc. worth $5.6M — about 8.4% of shares outstanding; the largest disclosed holder is VANGUARD CAPITAL MANAGEMENT LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
35
13F holders
$5.6M
value, 2026 filers
8.4%
of shares outstanding (7.9M sh)
12
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of CTM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $2.2M | 0.0% | 3.3% | +0.4% |
| 2 | Meridian Wealth Management, LLC | 863,200 | $621,418 | 0.0% | 0.9% | +9.8% |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | 816,037 | $587,637 | 0.0% | 0.9% | -13.6% |
| 4 | CAPTRUST FINANCIAL ADVISORS | 626,100 | $450,729 | 0.0% | 0.7% | 0.0% |
| 5 | VANGUARD FIDUCIARY TRUST CO | 492,717 | $354,756 | 0.0% | 0.5% | +17.8% |
| 6 | STATE STREET CORP | 303,900 | $218,778 | 0.0% | 0.3% | 0.0% |
| 7 | BlackRock, Inc. | 265,486 | $191,123 | 0.0% | 0.3% | 0.0% |
| 8 | Savvy Advisors, Inc. | 220,300 | $158,594 | 0.0% | 0.2% | -0.7% |
| 9 | UBS Group AG | 208,958 | $150,450 | 0.0% | 0.2% | +36.1% |
| 10 | NORTHERN TRUST CORP | 171,420 | $123,405 | 0.0% | 0.2% | -5.8% |
| 11 | Virtu Financial LLCNEW | 168,401 | $121 | 0.0% | 0.2% | new |
| 12 | JANE STREET GROUP, LLC | 129,071 | $92,918 | 0.0% | 0.1% | -45.5% |
| 13 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 94,794 | $68,242 | 0.0% | 0.1% | 0.0% |
| 14 | HUB Investment Partners, LLCNEW | 57,414 | $41,332 | 0.0% | 0.1% | new |
| 15 | Almanack Investment Partners, LLC. | 50,000 | $35,995 | 0.0% | 0.1% | 0.0% |
| 16 | Creative Planning | 50,000 | $35,995 | 0.0% | 0.1% | +146.1% |
| 17 | TWO SIGMA SECURITIES, LLC | 40,530 | $29,178 | 0.0% | 0% | +166.3% |
| 18 | ARQ WEALTH ADVISORS, LLCNEW | 35,000 | $22,750 | 0.0% | 0% | new |
| 19 | Pathstone Holdings, LLC | 31,179 | $22,446 | 0.0% | 0% | 0.0% |
| 20 | Vanguard Global Advisers, LLC | 27,344 | $19,688 | 0.0% | 0% | 0.0% |
| 21 | KESTRA PRIVATE WEALTH SERVICES, LLC | 27,250 | $19,617 | 0.0% | 0% | 0.0% |
| 22 | CAPITAL ADVISORS INC/OK | 22,000 | $15,838 | 0.0% | 0% | 0.0% |
| 23 | XTX Topco LtdNEW | 21,910 | $15,773 | 0.0% | 0% | new |
| 24 | ACT Advisors, LLC.NEW | 21,074 | $15,171 | 0.0% | 0% | new |
| 25 | PKS Advisory Services, LLCNEW | 18,931 | $13,628 | 0.0% | 0% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.