GROUP ONE TRADING LLC

CIK

932540

City

CHICAGO

State / Country

IL

Stock

MSB — Mesabi Trust

Top Portfolio Positions

1,824 positions · $2,524,842,002 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio	Open
MU	Micron Technology Inc Technology	155,688	$52,597,633	2.08%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	138,053	$46,655,011	1.85%
AG	First Majestic Silver Corp Basic Materials	1,934,908	$41,561,823	1.65%
MAR	Marriott International Inc /Md/ Consumer Cyclical	105,864	$34,624,938	1.37%
PBR	Petrobras - Petroleo Brasileiro SA Energy	1,581,009	$32,805,936	1.30%
KKR	KKR & Co. Inc. Financial Services	334,894	$30,977,695	1.23%
CYTK	Cytokinetics Inc Healthcare	363,997	$23,991,042	0.95%
CDE	Coeur Mining, Inc. Basic Materials	1,220,454	$22,907,921	0.91%
INTC	Intel Corp Technology	469,490	$20,718,593	0.82%
VST	Vistra Corp. Utilities	133,945	$20,135,951	0.80%

Portfolio Trend

25 quarters · across all stocks

Holdings in MSB

Compact Export CSV

Shares Held

Position Value (USD)

13 quarters 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 13F history on record for this holder in this stock.