13F

Stock

Castor Maritime Inc.

CTRM · held by 18 managers

Reported value

$692.4K

Holders

18

+4 new · −10 exited

Holders’ est. mark

−$71.5K

Price effect on 14 books still in the name

Largest holder

$444K

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$444K−$52.8KCut−$52.8K
Renaissance Technologies73.9K$136.7K−$8.93KAdded$52.7K
GOLDMAN SACHS GROUP INC21.1K$39K−$4.64KCut−$20.8K
Apriem Advisors19K$35.1K−$4.18KCut−$4.18K
Centiva Capital, LP11.1K$20.5KNew
SIMPLEX TRADING, LLC5.88K$10.9K−$582Added$5.4K
UBS Group AG2.23K$4.12K−$162Added$2.6K
GROUP ONE TRADING LLC671$1.24K−$148Cut−$4.33K
MORGAN STANLEY254$470−$56Cut−$66
SBI Securities Co., Ltd.101$187−$22Cut−$53
Allworth Financial LP20$37−$5Cut−$5
WOLFF WIESE MAGANA LLC20$37−$5Cut−$5
Farther Finance Advisors, LLC15$27New
Federation des caisses Desjardins du Quebec10$19−$2Cut−$2
Parallel Advisors, LLC10$19−$2Cut−$2
GILL CAPITAL PARTNERS, LLC6$11New
Caitong International Asset Management Co., Ltd4$7New
Russell Investments Group, Ltd.1$2$0Held

Who left

Positions as of Q1 2026. 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.