Vault-13

CASTOR MARITIME INC CTRM

SHS · Common Stock · CUSIP Y1146L208

25 institutional holders +6 vs Q1 2026
430,181430.2k shares reported held*
$902.9kreported value*
8 new 4 added 2 reduced 2 sold out net bought ≈ $117.4k (+55.9k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $2.10. Options: 3 managers hold calls ($106.4k notional), 2 hold puts ($42.0k).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0102030Q1 24: 21Q2 24: 23Q3 24: 23Q4 24: 18Q1 25: 17Q2 25: 18Q3 25: 18Q4 25: 25Q1 26: 19Q2 26: 2525Q1 24Q3 24Q1 25Q3 25Q1 26Q2 26
Numbers
QuarterHolders
Q1 202421
Q2 202423
Q3 202423
Q4 202418
Q1 202517
Q2 202518
Q3 202518
Q4 202525
Q1 202619
Q2 202625

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
20020Q3 24: 8 bought or addedQ3 24: 9 cut or sold outQ4 24: 8 bought or addedQ4 24: 10 cut or sold outQ4 24Q1 25: 6 bought or addedQ1 25: 5 cut or sold outQ2 25: 8 bought or addedQ2 25: 5 cut or sold outQ2 25Q3 25: 5 bought or addedQ3 25: 4 cut or sold outQ4 25: 13 bought or addedQ4 25: 6 cut or sold outQ4 25Q1 26: 7 bought or addedQ1 26: 14 cut or sold outQ2 26: 12 bought or addedQ2 26: 4 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 202489
Q4 2024810
Q1 202565
Q2 202585
Q3 202554
Q4 2025136
Q1 2026714
Q2 2026124

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$200k$400k$600kQ3 25 calls: $6.2kQ3 25 puts: $2.0kQ3 25P/C 0.32Q4 25 calls: $462.0kQ4 25 puts: $827Q4 25P/C 0.00Q1 26 calls: $218.1kQ1 26 puts: $185Q1 26P/C 0.00Q2 26 calls: $106.4kQ2 26 puts: $42.0kQ2 26P/C 0.39
Numbers
QuarterCallsPutsP/C
Q3 2025$6.2k$2.0k0.32
Q4 2025$462.0k$8270.00
Q1 2026$218.1k$1850.00
Q2 2026$106.4k$42.0k0.39

Biggest buyers

CITADEL ADVISORS LLC New +26,060+26.1k
NewEdge Advisors, LLC New +21,912+21.9k
SUSQUEHANNA INTERNATIONAL GROUP, LLP New +12,558+12.6k
TD Waterhouse Canada Inc. New +2,800+2.8k
SIMPLEX TRADING, LLC Added +2,632+2.6k
Centiva Capital, LP Added +1,159+1.2k
GOLDMAN SACHS GROUP INC Added +121+121
JONES FINANCIAL COMPANIES LLLP New +25+25
OSAIC HOLDINGS, INC. New +20+20
Caitong International Asset Management Co., Ltd Added +12+12

Biggest sellers

RENAISSANCE TECHNOLOGIES LLC Reduced -9,052-9.1k
UBS Group AG Sold out -2,227-2.2k
GROUP ONE TRADING LLC Reduced -100-100
Robinswood Financial LLC Sold out -15-15

Biggest calls

GROUP ONE TRADING LLC Reduced $74.8k35.8k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $31.1k14.9k shares
SIMPLEX TRADING, LLC Reduced $420200 shares

Biggest puts

CITADEL ADVISORS LLC New $41.6k19.9k shares
SIMPLEX TRADING, LLC New $420200 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 TOWERVIEW LLC 0.33% of their portfolio NEW YORK, NY 240,000240.0k $504.0k $504.0k 0.33% Unchanged
2 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 64,81764.8k $136.1k $136.1k 0.00% Reduced -9.1k -9,052
3 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 26,06026.1k $54.5k $54.5k 0.00% New
4 NewEdge Advisors, LLC 0.00% of their portfolio NEW ORLEANS, LA 21,91221.9k $46.0k $46.0k 0.00% New
5 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 21,20221.2k $44.5k $44.5k 0.00% Added +121 +121
6 Apriem Advisors 0.00% of their portfolio IRVINE, CA 19,00019.0k $39.9k $39.9k 0.00% Unchanged
7 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 12,55812.6k $26.2k $26.2k 0.00% New
8 Centiva Capital, LP 0.00% of their portfolio New York, NY 12,24812.2k $25.6k $25.6k 0.00% Added +1.2k +1,159
9 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 8,5108.5k $17.9k $17.9k 0.00% Added +2.6k +2,632
10 TD Waterhouse Canada Inc. 0.00% of their portfolio TORONTO, A6 2,8002.8k $5.9k $5.9k 0.00% New
11 GROUP ONE TRADING LLC 0.00% of their portfolio CHICAGO, IL 571571 $1.2k $1.2k 0.00% Reduced -100 -100
12 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 254254 $533 $533 0.00% Unchanged
13 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 101101 $212 $212 0.00% Unchanged
14 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 2525 $53 $53 0.00% New
15 Allworth Financial LP 0.00% of their portfolio FOLSOM, CA 2020 $42 $42 0.00% Unchanged
16 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 2020 $42 $42 0.00% New
17 WOLFF WIESE MAGANA LLC 0.00% of their portfolio CARSLBAD, CA 2020 $42 $42 0.00% Unchanged
18 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 1616 $34 $34 0.00% Added +12 +12
19 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 1515 $32 $32 0.00% Unchanged
20 Parallel Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 1010 $21 $21 0.00% Unchanged
21 Federation des caisses Desjardins du Quebec 0.00% of their portfolio LEVIS, A8 1010 $21 $21 0.00% Unchanged
22 GILL CAPITAL PARTNERS, LLC 0.00% of their portfolio DENVER, CO 66 $13 $13 0.00% Unchanged
23 Cape Investment Advisory, Inc. 0.00% of their portfolio MCDONOUGH, GA 44 $8 $8 0.00% New
24 Russell Investments Group, Ltd. 0.00% of their portfolio Seattle, WA 11 $2 $2 0.00% Unchanged
25 Steward Partners Investment Advisory, LLC 0.00% of their portfolio STAMFORD, CT 11 $2 $2 0.00% New