Castor Maritime Inc. (CTRM) Ownership
CTRM ownership summary
as of October 18, 2026- Institutions
- 4.5% of shares outstanding
- Insiders
- 0.12% of shares outstanding
- Shares outstanding
- 9.7M
- Float
- 9.7M shares available to trade
- Short interest
- 0.04% 3,632 shares short
- Days to cover
- 0.06 short interest down 63.0% vs prior month
- Institutions 4.46%
- Insiders 0.12%
- Other investors 95.43%
CTRM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Towerview LLC | 2.48% | 240K | $393,600 | — | June 30, 2026 |
| 2 | Renaissance Technologies Corp | 0.67% | 65K | $106,300 | −9,052 (−12.3%) | June 30, 2026 |
| 3 | Citadel Advisors Llc | 0.27% | 26K | $42,738 | +26,060 (0.0%) | June 30, 2026 |
| 4 | Goss Wealth Management LLC | 0.23% | 22K | $35,936 | +21,912 (0.0%) | June 30, 2026 |
| 5 | The Goldman Sachs Group Inc | 0.22% | 21K | $34,771 | +121 (+0.6%) | June 30, 2026 |
| 6 | Iwamoto, Kong & Co., Inc. | 0.20% | 19K | $31,160 | — | June 30, 2026 |
| 7 | Susquehanna International Group, LLP | 0.13% | 13K | $20,595 | +12,558 (0.0%) | June 30, 2026 |
| 8 | Centiva Capital LP | 0.13% | 12K | $20,087 | +1,159 (+10.5%) | June 30, 2026 |
| 9 | SIMPLEX TRADING, LLC | 0.09% | 8,510 | $13,956 | +2,632 (+44.8%) | June 30, 2026 |
| 10 | TD Waterhouse Canada Inc | 0.03% | 2,800 | $4,592 | +2,800 (0.0%) | June 30, 2026 |
| 11 | Group One Trading, LLC | 0.01% | 571 | $936 | −100 (−14.9%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | <0.01% | 254 | $417 | — | June 30, 2026 |
| 13 | SBI Securities Co Ltd | <0.01% | 101 | $166 | — | June 30, 2026 |
| 14 | JONES FINANCIAL COMPANIES LLLP | <0.01% | 25 | $41 | +25 (0.0%) | June 30, 2026 |
| 15 | Hanson Mcclain Inc | <0.01% | 20 | $33 | — | June 30, 2026 |
| 16 | WOLFF WIESE MAGANA LLC | <0.01% | 20 | $33 | — | June 30, 2026 |
| 17 | Advisor Group Holdings, Inc. | <0.01% | 20 | $33 | +20 (0.0%) | June 30, 2026 |
| 18 | Caitong International Asset Management Co., Limited. | <0.01% | 16 | $26 | +12 (+300.0%) | June 30, 2026 |
| 19 | Parallel Advisors, LLC | <0.01% | 10 | $16 | — | June 30, 2026 |
| 20 | Federation des caisses Desjardins du Quebec | <0.01% | 10 | $16 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 67K shares and 2 cut 9,152.
CTRM top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Nasdaq Composite Index | 0.03% | 3,264 | $5,353 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CTRM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CTRM
Institutional investors own 4.5% of Castor Maritime's shares and insiders 0.12%. The largest holder is Towerview LLC with 2.48% of the shares (240K), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 2 reduced their stake in the latest filings. Short interest is 0.04% of the float, or 0.06 days of average trading volume. The share count rose 40,160.0% since 2017.
Related: CTRM key metrics. See the CTRM stock overview for the latest quote and news.
CTRM ownership FAQ
Who owns the most Castor Maritime stock?
The largest shareholders of Castor Maritime are Towerview LLC (2.48%), Renaissance Technologies Corp (0.67%), Citadel Advisors Llc (0.27%), Goss Wealth Management LLC (0.23%), The Goldman Sachs Group Inc (0.22%).
What percentage of Castor Maritime is owned by institutions?
Institutions hold 4.5% of Castor Maritime's shares outstanding; insiders hold 0.12%.
Which funds own Castor Maritime?
The largest fund holders of Castor Maritime are Fidelity Nasdaq Composite Index (0.03%).
What is Castor Maritime's short interest?
3,632 shares of Castor Maritime were sold short, 0.04% of the float; at the average daily volume it would take 0.06 days to cover.
How many shares of Castor Maritime are outstanding?
Castor Maritime has 9.7M shares outstanding, of which 9.7M are in the public float.