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 September 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 | 99.8% |
| SIMPLEX TRADING, LLC | 328 | 0.1% |
| SBI Securities Co., Ltd. | 101 | 0.0% |
| Allworth Financial LP | 20 | 0.0% |
| WOLFF WIESE MAGANA LLC | 20 | 0.0% |
| Farther Finance Advisors, LLC | 15 | 0.0% |
| Caitong International Asset Management Co., Ltd | 14 | 0.0% |
| TD Waterhouse Canada Inc. | 12 | 0.0% |
| Parallel Advisors, LLC | 10 | 0.0% |
| Nova Financial LLC | 5 | 0.0% |
| Cape Investment Advisory, Inc. | 4 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| SIMPLEX TRADING, LLC | Reduced | 8.5K | 328 | -8.2K |
| TD Waterhouse Canada Inc. | Reduced | 2.8K | 12 | -2.8K |
| GILL CAPITAL PARTNERS, LLC | Sold Out | 6 | 0 | -6 |
| Caitong International Asset Management Co., Ltd | Reduced | 16 | 14 | -2 |
| Russell Investments Group, Ltd. | Sold Out | 1 | 0 | -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.