CTRM Castor Maritime Inc.
Castor Maritime Inc. (CTRM) Institutional Ownership
What the institutions did with CTRM last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| TOWERVIEW LLC | 240.0K | 55.8% |
| RENAISSANCE TECHNOLOGIES LLC | 64.8K | 15.1% |
| CITADEL ADVISORS LLC | 26.1K | 6.1% |
| NewEdge Advisors, LLC | 21.9K | 5.1% |
| GOLDMAN SACHS GROUP INC | 21.2K | 4.9% |
| Apriem Advisors | 19.0K | 4.4% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 12.6K | 2.9% |
| Centiva Capital, LP | 12.2K | 2.8% |
| SIMPLEX TRADING, LLC | 8.5K | 2.0% |
| TD Waterhouse Canada Inc. | 2.8K | 0.7% |
| GROUP ONE TRADING LLC | 571 | 0.1% |
| MORGAN STANLEY | 254 | 0.1% |
| SBI Securities Co., Ltd. | 101 | 0.0% |
| JONES FINANCIAL COMPANIES LLLP | 25 | 0.0% |
| Allworth Financial LP | 20 | 0.0% |
| OSAIC HOLDINGS, INC. | 20 | 0.0% |
| WOLFF WIESE MAGANA LLC | 20 | 0.0% |
| Caitong International Asset Management Co., Ltd | 16 | 0.0% |
| Farther Finance Advisors, LLC | 15 | 0.0% |
| Parallel Advisors, LLC | 10 | 0.0% |
| Federation des caisses Desjardins du Quebec | 10 | 0.0% |
| GILL CAPITAL PARTNERS, LLC | 6 | 0.0% |
| Cape Investment Advisory, Inc. | 4 | 0.0% |
| Russell Investments Group, Ltd. | 1 | 0.0% |
| Steward Partners Investment Advisory, LLC | 1 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| CITADEL ADVISORS LLC | New | 0 | 26.1K | +26.1K |
| NewEdge Advisors, LLC | New | 0 | 21.9K | +21.9K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | 0 | 12.6K | +12.6K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 73.9K | 64.8K | -9.1K |
| TD Waterhouse Canada Inc. | New | 0 | 2.8K | +2.8K |
| SIMPLEX TRADING, LLC | Increased | 5.9K | 8.5K | +2.6K |
| UBS Group AG | Sold Out | 2.2K | 0 | -2.2K |
| Centiva Capital, LP | Increased | 11.1K | 12.2K | +1.2K |
| GOLDMAN SACHS GROUP INC | Increased | 21.1K | 21.2K | +121 |
| GROUP ONE TRADING LLC | Reduced | 671 | 571 | -100 |
| JONES FINANCIAL COMPANIES LLLP | New | 0 | 25 | +25 |
| OSAIC HOLDINGS, INC. | New | 0 | 20 | +20 |
| Robinswood Financial LLC | Sold Out | 15 | 0 | -15 |
| Caitong International Asset Management Co., Ltd | Increased | 4 | 16 | +12 |
| Cape Investment Advisory, Inc. | New | 0 | 4 | +4 |
| Steward Partners Investment Advisory, LLC | New | 0 | 1 | +1 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.