New Positions
12 managers initiated
Top five by reported value
Castor Maritime Inc NASDAQ NMS - GLOBAL MARKET:CTRM
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
12 new4 added9 reduced2 exited
Total Institutional Holders
25
as of 2025-12-31
Top Holder
TOWERVIEW LLC
$496.8K
Largest QoQ Increase
CITADEL ADVISORS LLC
+191,057 sh
Largest QoQ Decrease
SIMPLEX TRADING, LLC
-10,828 sh
New Positions(12)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| CITADEL ADVISORS LLC | 191,057 | +191,057 | $395.5K | +$395.5K | — |
| JANE STREET GROUP, LLC | 17,898 | +17,898 | $37.0K | +$37.0K | — |
| TWO SIGMA SECURITIES, LLC | 17,297 | +17,297 | $35.8K | +$35.8K | — |
| Garton & Associates Financial Advisors LLC | 2,000 | +2,000 | $4.1K | +$4.1K | — |
| Tower Research Capital LLC (TRC) | 122 | +122 | $253 | +$253 | — |
| Allworth Financial LP | 20 | +20 | $42 | +$42 | — |
| Strategic Investment Solutions, Inc. /IL | 20 | +20 | $42 | +$42 | — |
| Virtu Financial LLC | 11,852 | +11,852 | $25 | +$25 | — |
| JONES FINANCIAL COMPANIES LLLP | 6 | +6 | $12 | +$12 | — |
| Cape Investment Advisory, Inc. | 4 | +4 | $8 | +$8 | — |
| Russell Investments Group, Ltd. | 1 | +1 | $2 | +$2 | — |
| Navalign, LLC | 1 | +1 | $2 | +$2 | — |
Added To(4)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 113,318 | +97,984 | $234.6K | +$202.7K | 639.0% |
| UBS Group AG | 736 | +685 | $1.5K | +$1.4K | 1343.1% |
| GROUP ONE TRADING, L.P. | 2,691 | +100 | $5.6K | +$181 | 3.9% |
| GOLDMAN SACHS GROUP INC | 28,911 | +63 | $59.8K | -$158 | 0.2% |
Reduced(9)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| MORGAN STANLEY | 259 | -8,805 | $536 | -$18.3K | -97.1% |
| SIMPLEX TRADING, LLC | 2,643 | -10,828 | $5.5K | +$5.4K | -80.4% |
| RENAISSANCE TECHNOLOGIES LLC | 40,569 | -2,100 | $84.0K | -$4.8K | -4.9% |
| TOWERVIEW LLC | 240,000 | 0 | $496.8K | -$2.4K | 0.0% |
| Apriem Advisors | 19,000 | 0 | $39.3K | -$190 | 0.0% |
| SBI Securities Co., Ltd. | 116 | 0 | $240 | -$1 | 0.0% |
| Federation des caisses Desjardins du Quebec | 10 | 0 | $21 | $0 | 0.0% |
| Parallel Advisors, LLC | 10 | 0 | $21 | $0 | 0.0% |
| WOLFF WIESE MAGANA LLC | 20 | 0 | $42 | $0 | 0.0% |
Sold Out(2)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Founders Capital Management | 0 | -2,800 | $0 | -$5.8K | — |
| Larson Financial Group LLC | 0 | -240 | $0 | -$499 | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| TOWERVIEW LLC | 240,000 | $496.8K | 0 | 0.0% |
| CITADEL ADVISORS LLC | 191,057 | $395.5K | +191,057 | — |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 113,318 | $234.6K | +97,984 | 639.0% |
| RENAISSANCE TECHNOLOGIES LLC | 40,569 | $84.0K | -2,100 | -4.9% |
| GOLDMAN SACHS GROUP INC | 28,911 | $59.8K | +63 | 0.2% |
| Apriem Advisors | 19,000 | $39.3K | 0 | 0.0% |
| JANE STREET GROUP, LLC | 17,898 | $37.0K | +17,898 | — |
| TWO SIGMA SECURITIES, LLC | 17,297 | $35.8K | +17,297 | — |
| GROUP ONE TRADING, L.P. | 2,691 | $5.6K | +100 | 3.9% |
| SIMPLEX TRADING, LLC | 2,643 | $5.5K | -10,828 | -80.4% |
| Garton & Associates Financial Advisors LLC | 2,000 | $4.1K | +2,000 | — |
| UBS Group AG | 736 | $1.5K | +685 | 1343.1% |
| MORGAN STANLEY | 259 | $536 | -8,805 | -97.1% |
| Tower Research Capital LLC (TRC) | 122 | $253 | +122 | — |
| SBI Securities Co., Ltd. | 116 | $240 | 0 | 0.0% |
| WOLFF WIESE MAGANA LLC | 20 | $42 | 0 | 0.0% |
| Strategic Investment Solutions, Inc. /IL | 20 | $42 | +20 | — |
| Allworth Financial LP | 20 | $42 | +20 | — |
| Virtu Financial LLC | 11,852 | $25 | +11,852 | — |
| Parallel Advisors, LLC | 10 | $21 | 0 | 0.0% |
New & Closed Positions this quarter
Closed Positions
2 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for CTRM against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.