GROUP ONE TRADING LLC

Position in MSB — Mesabi Trust

CIK 932540 CHICAGO, IL

Position in MSB

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$4,567

-$12,420 QoQ

Shares Held

145

-67.1% QoQ

Ownership

0.001%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

13 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Basic Materials · as of Mar 31, 2026

GROUP ONE TRADING LLC holds $5,865,427 across 6 Steel names. MSB ranks #6 (0.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	STLD	Steel Dynamics Inc	15,298	$2,753,640
2	CLF	Cleveland-Cliffs Inc.	320,309	$2,706,611
3	ASTL	Algoma Steel Group Inc.	85,656	$353,759
4	GGB	Gerdau S.A.	7,584	$27,378
5	TX	Ternium S.A.	485	$19,472
6	MSB	Mesabi Trust This page	145	$4,567

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$4,567	145	-67.1%	Shares	Sole	2026-05-13
2025-12-31	$16,987	441	+975.6%	Shares	Sole	2026-02-12
2025-09-30	$1,200	41	-59.0%	Shares	Sole	2025-11-12
2024-03-31	$1,770	100	0.0%	Shares	Sole	2024-05-10
2023-12-31	$2,047	100	-89.8%	Shares	Sole	2024-02-14
2022-12-31	$17,641	979	+482.7%	Shares	Sole	2023-02-09
2022-09-30	$3,613	168	-70.4%	Shares	Sole	2022-11-09
2022-03-31	$15,131	568	-60.4%	Shares	Sole	2022-05-12
2021-12-31	$37,912	1,435	-83.6%	Shares	Sole	2022-02-11
2021-09-30	$259,873	8,747	-36.4%	Shares	Sole	2021-11-12
2021-06-30	$486,643	13,747	+1620.5%	Shares	Sole	2021-08-10
2020-09-30	$16,954	799	+732.3%	Shares	Sole	2020-11-12
2020-06-30	$1,680	96	—	Shares	Sole	2020-08-13
No filing history on record for this holder in this stock.