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10-K primary document
MG · Annual Report (Form 10-K) · Filed March 11, 2026

Mistras Group Inc — 10-K exhibit

a20211231subsidiarylisting.htm
Mistras Group Inc on Boardroom Alpha
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Exhibit 21.1

The following is a list of subsidiaries of the registrant. The list omits some subsidiaries which, in the aggregate, would not constitute a significant subsidiary.

NameJurisdiction of Organization
Assistances Controles TechnologiesFrance
Controles Industriels de L'entangFrance
GMA Aeronautica S.L.U.Germany
GMA Holding B.V.The Netherlands
GMA Werkstoffprufung GmbHGermany
Mistras Arizona Inspection Services LLCDelaware
Mistras Canada, Inc.Canada
Mistras Group B.V.The Netherlands
Mistras Group BVBABelgium
Mistras Group Holding GmbHGermany
Mistras Group Hellas A.B.E.E.Greece
Mistras Group LimitedEngland and Wales
Mistras Group SASFrance
Mistras International Holdings Inc.Delaware
Mistras KAA Partners Inc.Canada
Mistras Mexico Holdings Inc.Delaware
Mistras Onstream S. de R.L. de C.V.Mexico
Mistras Quebec Holdings Inc.Canada
Mistras Ropeworks Training LLCDelaware
Mistras Services Inc.Canada
Mistras South America Ltda.Brazil
Mistras Western Canada Holdings Inc.Canada
MWC Management Inc.Canada
NDT do Brasil Ltd.Brazil
Onstream Pipeline Inspection Services Inc.Canada
Physical Acoustics India Private Ltd.India
Quality Services Laboratories, Inc. (1)Delaware
QSL NDT Inc.Delaware
QSL Quebec Inc.Canada
R.A.C. Group Inc.Canada
Rope Access Calgary Inc.Canada

(1) Also does business under the names QSL and QSL Plus.

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