Castor Maritime Inc. (CTRM) Institutional Ownership

Ownership Summary

Recent 13F filings as of December 2025 show that 22 institutional investors hold a position in Castor Maritime Inc. (NASDAQ:CTRM).

• The collective stake of institutional investors in Castor Maritime moved to 11.7% in December 2025, a shift up from the 9.1% reported for September 2025.
• On a quarter-over-quarter basis, institutional holdings shifted by 29.33%, with a year-over-year an increase of 15.79% in the count of filers.
• The latest 13F cycle for Castor Maritime reveals that of 22 total investors, 11 funds grew their exposure, whereas 3 reduced theirs and 8 made no changes.
• Collectively, institutional investors increased their stake in Castor Maritime to 480.09K shares as of December 2025, a change that is up by 108.88K shares quarter on quarter and up 89.06K shares year over year.
• TOWERVIEW LLC continues to be the largest institutional holder of Castor Maritime as of December 31, 2025, with a position of 240.00K shares, representing 5.84% of the company's outstanding stock.
• Among the most significant buyers of Castor Maritime during December 2025 were CITADEL ADVISORS LLC (73.36K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (21.08K), JANE STREET GROUP, LLC (17.90K), TWO SIGMA SECURITIES, LLC (17.30K), UBS Group AG (685).
• Leading sellers of Castor Maritime stock in December 2025 included SIMPLEX TRADING, LLC (10.83K), MORGAN STANLEY (8.80K), RENAISSANCE TECHNOLOGIES LLC (2.10K).
• The top 10 institutional holders of Castor Maritime for the quarter ending December 2025 included TOWERVIEW LLC (240.00K), CITADEL ADVISORS LLC (73.36K), RENAISSANCE TECHNOLOGIES LLC (40.57K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (36.42K), GOLDMAN SACHS GROUP INC (28.91K), Apriem Advisors (19.00K), JANE STREET GROUP, LLC (17.90K), TWO SIGMA SECURITIES, LLC (17.30K), GROUP ONE TRADING LLC (2.69K), SIMPLEX TRADING, LLC (2.64K).