13F

Stock

Castor Maritime Inc.

CTRM · held by 24 managers

Reported value

$998K

Holders

24

+0 new · −1 exited

Holders’ est. mark

−$3

Price effect on 3 books still in the name

Largest holder

$496.8K

TOWERVIEW LLC

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
TOWERVIEW LLC240K$496.8KHeld
Citadel73.4K$151.8KHeld
Renaissance Technologies40.6K$84KHeld
SUSQUEHANNA INTERNATIONAL GROUP, LLP36.4K$75.4KHeld
GOLDMAN SACHS GROUP INC28.9K$59.8KHeld
Apriem Advisors19K$39.3KHeld
JANE STREET GROUP, LLC17.9K$37KHeld
TWO SIGMA SECURITIES, LLC17.3K$35.8KHeld
GROUP ONE TRADING LLC2.69K$5.57KHeld
SIMPLEX TRADING, LLC2.64K$5.47KHeld
Garton & Associates Financial Advisors LLC2K$4.14KHeld
UBS Group AG736$1.52KHeld
MORGAN STANLEY259$536−$3Cut−$18.3K
Tower Research Capital LLC (TRC)122$253Held
SBI Securities Co., Ltd.116$240Held
Allworth Financial LP20$42$0Held
WOLFF WIESE MAGANA LLC20$42Held
Virtu Financial LLC11.9K$25Held
Parallel Advisors, LLC10$21Held
Federation des caisses Desjardins du Quebec10$21Held
JONES FINANCIAL COMPANIES LLLP6$12Held
Cape Investment Advisory, Inc.4$8$0Held
Navalign, LLC1$2Held
Russell Investments Group, Ltd.1$2Held

Who left

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.