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Castor Maritime
CTRM

25 hedge funds and large institutions have $1.02M invested in Castor Maritime in 2025 Q4 according to their latest regulatory filings, with 10 funds opening new positions, 4 increasing their positions, 3 reducing their positions, and 3 closing their positions.

New
Increased
Maintained
Reduced
Closed

46,100% more call options, than puts

Call options by funds: $462K | Put options by funds: $1K

233% more first-time investments, than exits

New positions opened: 10 | Existing positions closed: 3

39% more funds holding

Funds holding: 18 → 25 (+7)

33% more repeat investments, than reductions

Existing positions increased: 4 | Existing positions reduced: 3

31% more capital invested

Capital invested by funds: $778K → $1.02M (+$244K)

1.24% more ownership

Funds ownership: 3.87% → 5.11% (+1.2%)

Holders
25
Holders Change
+7
Holders Change %
+38.89%
% of All Funds
0.3%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
10
Increased
4
Reduced
3
Closed
3
Calls
$462K
Puts
$1K
Net Calls
+$461K
Net Calls Change
+$457K

Top Buyers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
+$153K
2
Susquehanna International Group
Susquehanna International Group
Pennsylvania
+$44K
3
Jane Street
Jane Street
New York
+$37.3K
4
TSS
Two Sigma Securities
New York
+$36.1K
5
VF
Virtu Financial
New York
+$24.7K

Top Sellers

Rank Fund Capital Flow
1
Simplex Trading
Simplex Trading
Illinois
-$22.6K
2
Morgan Stanley
Morgan Stanley
New York
-$18.4K
3
FCMT
Founders Capital Management (Texas)
Texas
-$5.82K
4
Renaissance Technologies
Renaissance Technologies
New York
-$4.38K
5
LFG
Larson Financial Group
Missouri
-$499
Name Holding Trade Value Shares
Change 		Change in
Stake
TL
1
TowerView LLC
New York
$497K – – –
Citadel Advisors
2
Citadel Advisors
Florida
$152K +$153K +73,357 New
Renaissance Technologies
3
Renaissance Technologies
New York
$84K -$4.38K -2,100 -5%
Susquehanna International Group
4
Susquehanna International Group
Pennsylvania
$75.4K +$44K +21,084 +137%
Goldman Sachs
5
Goldman Sachs
New York
$59.8K +$131 +63 +0.2%
AA
6
Apriem Advisors
California
$39.3K – – –
Jane Street
7
Jane Street
New York
$37K +$37.3K +17,898 New
TSS
8
Two Sigma Securities
New York
$35.8K +$36.1K +17,297 New
VF
9
Virtu Financial
New York
$25K +$24.7K +11,852 New
Group One Trading
10
Group One Trading
Illinois
$5.57K +$209 +100 +4%
Simplex Trading
11
Simplex Trading
Illinois
$5.47K -$22.6K -10,828 -80%
GAFA
12
Garton & Associates Financial Advisors
Kentucky
$4.14K +$4.17K +2,000 New
UBS Group
13
UBS Group
Switzerland
$1.52K +$1.43K +685 +1,343%
Morgan Stanley
14
Morgan Stanley
New York
$536 -$18.4K -8,805 -97%
TRCT
15
Tower Research Capital (TRC)
New York
$253 +$255 +122 New
SS
16
SBI Securities
Japan
$240 – – –
AF
17
Allworth Financial
California
$42 – – –
WWM
18
Wolff Wiese Magana
California
$42 – – –
RF
19
Robinswood Financial
Washington
$31 +$31 +15 New
FDCDDQ
20
Federation des caisses Desjardins du Quebec
Quebec, Canada
$21 – – –
PA
21
Parallel Advisors
California
$21 – – –
Jones Financial Companies
22
Jones Financial Companies
Missouri
$12 +$13 +6 New
CIA
23
Cape Investment Advisory
Georgia
$8 – – –
NL
24
Navalign LLC
California
$2 +$2 +1 New
Russell Investments Group
25
Russell Investments Group
United Kingdom
$2 +$2 +1 New
1
2

CTRM Hedge Fund Activity: Q4 2025 in Review

25 of the 8,238 institutional investors tracked by Wall St. Rank reported a position in Castor Maritime (CTRM) for Q4 2025, worth a combined $1.02M — up 31% from $778K a quarter earlier.

Buyers outnumbered sellers: 10 funds opened new CTRM positions and 3 closed out — a net gain of 7 holders — while 4 added to existing stakes and 3 trimmed.

The largest buyer was Citadel Advisors, opening a new position worth an estimated $153K. The largest seller was Simplex Trading, cutting an estimated $22.6K.

  • 25 institutional investors held Castor Maritime (CTRM) as of Q4 2025, up from 18 in Q3 2025.
  • Funds reported $1.02M of Castor Maritime stock for Q4 2025, up 31% quarter-over-quarter.
  • 10 funds opened new Castor Maritime positions in Q4 2025 and 3 closed out, a net change of +7 holders.
  • The largest Castor Maritime buyer in Q4 2025 was Citadel Advisors, an estimated $153K added.
  • The largest Castor Maritime seller in Q4 2025 was Simplex Trading, an estimated $22.6K sold.

Based on aggregated 13F filings for Q4 2025.