GROUP ONE TRADING LLC

Position in MG — Mistras Group, Inc.

CIK 932540 CHICAGO, IL

Position in MG

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$131,339

+$128,323 QoQ

Shares Held

7,518

+2157.7% QoQ

Ownership

0.024%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#95

of 136 holders

Holding Since

Mar 2021

6 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $1,738,067 across 5 Security & Protection Services names. MG ranks #2 (7.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CXW	CoreCivic, Inc.	52,084	$1,582,311
2	MG	Mistras Group, Inc. This page	7,518	$131,339
3	ALLE	Allegion plc	151	$21,213
4	BRC	Brady Corp	22	$2,014
5	NL	Nli Holdings, Inc.	200	$1,190

6 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$131,339	7,518	+2157.7%	Shares	Sole	2026-08-14
2024-12-31	$3,016	333	-70.5%	Shares	Sole	2025-05-14
2022-03-31	$7,456	1,128	-77.3%	Shares	Sole	2022-05-12
2021-09-30	$50,576	4,978	-67.0%	Shares	Sole	2021-11-12
2021-06-30	$148,216	15,078	-0.7%	Shares	Sole	2021-08-10
2021-03-31	$173,317	15,190	—	Shares	Sole	2021-05-12
No filing history on record for this holder in this stock.