Castor Maritime Inc.
Castor Maritime Inc. (CTRM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · CTRM · as of Mar 31, 2025
Ownership Breakdown
19
Institutional Holders
▲ 1 vs Q4
$925,127
Total Inst. Value
▼ $150,214 vs Q4
9.66M
Shares Outstanding
freeFloat 99.88%
405,822
13F Shares Held
▲ 14,790 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
CTRM largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
TOWERVIEW LLC deep sea foreign transportation of freight | 240.0K | 2.48% | 2.48% | $547.20M | May 6, 2025 | — held |
RENAISSANCE TECHNOLOGIES LLC deep sea foreign transportation of freight | 39.7K | 41.06% | 41.06% | $90.44M | May 14, 2025 | — held |
SUSQUEHANNA INTERNATIONAL GROUP, LLP deep sea foreign transportation of freight | 26.9K | 27.80% | 27.80% | $61.25M | May 14, 2025 | ▲ 6.9K |
GOLDMAN SACHS GROUP INC deep sea foreign transportation of freight | 26.6K | 27.53% | 27.53% | $60.65M | Jun 27, 2025 | ▲ 4.6K |
SQUAREPOINT OPS LLC deep sea foreign transportation of freight | 23.3K | 24.11% | 24.11% | $53.11M | Aug 27, 2025 | ▼ 5.1K |
APRIEM ADVISORS deep sea foreign transportation of freight | 19.0K | 19.66% | 19.66% | $43.32M | May 15, 2025 | — held |
CITADEL ADVISORS LLC deep sea foreign transportation of freight | 18.5K | 19.15% | 19.15% | $42.18M | May 15, 2025 | ▲ 18.5K |
SIMPLEX TRADING, LLC deep sea foreign transportation of freight | 13.2K | 13.69% | 13.69% | $30.00M | May 12, 2025 | ▲ 13.2K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP deep sea foreign transportation of freight | 11.5K | 11.90% | 11.90% | $26.22M | May 14, 2025 | NEW |
WOLVERINE TRADING, LLC deep sea foreign transportation of freight | 10.8K | 11.18% | 11.18% | $25.60M | May 15, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
7
Increased
+46.2K shares2
New Positions
first time holders3
Decreased
−9.6K shares3
Sold Out
fully exitedNet shares change (top 50)
+36.6K
+46.2K / −9.6K
Net new holders
+3
2 new / 3 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
CTRM insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Castor Maritime Inc. (CTRM) is primarily owned by institutional investors, who hold approximately 4.2% of total shares outstanding. Company insiders own approximately 0.12%, while retail and public investors account for the remaining 95.68%.
The largest institutional shareholder of Castor Maritime Inc. is TOWERVIEW LLC, holding approximately 240,000 shares — equal to 2.48% of outstanding shares — as of March 31, 2025.
A total of 19 institutional investors currently hold CTRM stock, with a combined institutional value of approximately $925,127 as of the most recent 13F filing period.
Frequently asked questions
CTRM ownershipCastor Maritime Inc. (CTRM) is primarily owned by institutional investors, who hold approximately 4.2% of shares. The largest shareholder is TOWERVIEW LLC with a 2.48% stake. Company insiders hold 0.12%. Data sourced from SEC Form 13F as of March 31, 2025.