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

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.