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GROUP ONE TRADING LLC

Position in CTRM — Castor Maritime Inc.

CIK 932540 CHICAGO, IL

Position in CTRM

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$1,199
-$42 QoQ
Shares Held
571
-14.9% QoQ
Ownership
0.006%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#11
of 25 holders
Holding Since
Jun 2021
10 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in CTRM Over Time

Shares Held

Position Value (USD)

Position in Marine Shipping

Industrials · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $19,398,150 across 12 Marine Shipping names. CTRM ranks #12 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in CTRM

Export CSV
10 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $1,199 571
2026-03-31 $1,241 671
2025-12-31 $5,570 2,691
2025-09-30 $5,389 2,591
2025-06-30 $5,077 2,374
2025-03-31 $6,135 2,691
2024-09-30 $30,573 7,245
2024-06-30 $12,976 2,821
2021-09-30 $11,841 4,853
2021-06-30 $4,016 1,542