Castor Maritime Inc.
CTRM- Exchange
- Nasdaq
- Industry
- Deep Sea Foreign Transportation of Freight
- SEC CIK
- 0001720161
No open-market purchases or sales by Castor Maritime Inc. insiders were filed in the last 90 days; 25 institutions reported holding it in 13F filings for Q2 2026, worth $902.9K in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Castor Maritime Inc. as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 18
- +2 vs. Q2 2025
- Shares held
- 374.3K
- −24.9K (−6.2%) vs. Q2 2025
- Total value
- $778.5K
- −$74.2K (−8.7%) vs. Q2 2025
- New holders
- 2
- 3 more added
- Sold out
- 0
- 4 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CTRM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 25 | $902.9K |
| Q1 2026 | 19 | $692.4K |
| Q4 2025 | 25 | $1.02M |
| Q3 2025 | 18 | $778.5K |
| Q2 2025 | 17 | $852.6K |
| Q1 2025 | 16 | $925.1K |
| Q4 2024 | 17 | $1.08M |
| Q3 2024 | 22 | $658.9K |
| Q2 2024 | 22 | $577.8K |
| Q1 2024 | 20 | $329.0K |
| Q4 2023 | 30 | $443.5K |
| Q3 2023 | 28 | $392.7K |
| Q2 2023 | 27 | $398.9K |
| Q1 2023 | 29 | $1.48M |
| Q4 2022 | 33 | $1.91M |
| Q3 2022 | 28 | $1.44M |
| Q2 2022 | 32 | $1.95M |
| Q1 2022 | 28 | $1.68M |
| Q4 2021 | 29 | $5.60M |
| Q3 2021 | 33 | $6.66M |
| Q2 2021 | 31 | $12.2M |
| Q1 2021 | 40 | $7.71M |
Institutions, Q3 2025
Shares, value and share of portfolio for each institution holding Castor Maritime Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Towerview LLC | 240,000 | $499.2K | 0.36% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 42,669 | $88.8K | 0.00% | +2,000+4.9% | Added |
| Goldman Sachs Group Inc | 28,848 | $60.0K | 0.00% | −706−2.4% | Reduced |
| Apriem Advisors | 19,000 | $39.5K | 0.00% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 15,334 | $31.9K | 0.00% | −25,101−62.1% | Reduced |
| Simplex Trading, LLC | 13,471 | $28.0K | 0.00% | +1,782+15.2% | Added |
| Morgan Stanley | 9,064 | $18.9K | 0.00% | −3,402−27.3% | Reduced |
| Founders Capital Management | 2,800 | $5.82K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 2,591 | $5.39K | 0.00% | +217+9.1% | Added |
| Larson Financial Group LLC | 240 | $499 | 0.00% | +240 | New |
| SBI Securities Co., Ltd. | 116 | $241 | 0.00% | −1−0.9% | Reduced |
| UBS Group AG | 51 | $106 | 0.00% | +51 | New |
| Allworth Financial LP | 20 | $42 | 0.00% | 00.0% | Unchanged |
| Wolff Wiese Magana LLC | 20 | $42 | 0.00% | 00.0% | Unchanged |
| Strategic Investment Solutions, Inc. | 20 | $42 | 0.00% | 00.0% | Unchanged |
| Parallel Advisors, LLC | 10 | $21 | 0.00% | 00.0% | Unchanged |
| Federation des caisses Desjardins du Quebec | 10 | $21 | 0.00% | 00.0% | Unchanged |
| Cape Investment Advisory, Inc. | 4 | $8 | 0.00% | 00.0% | Unchanged |
| Iron Horse Wealth Management, LLC | – | – | – | – | Not filed |