EX-21.1 4 a20211231subsidiarylisting.htm EX-21.1
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.

Name |  | Jurisdiction of Organization
Assistances Controles Technologies |  | France
Controles Industriels de L'entang |  | France
GMA Aeronautica S.L.U. |  | Germany
GMA Holding B.V. |  | The Netherlands
GMA Werkstoffprufung GmbH |  | Germany
Mistras Arizona Inspection Services LLC |  | Delaware
Mistras Canada, Inc. |  | Canada
Mistras Group B.V. |  | The Netherlands
Mistras Group BVBA |  | Belgium
Mistras Group Holding GmbH |  | Germany
Mistras Group Hellas A.B.E.E. |  | Greece
Mistras Group Limited |  | England and Wales
Mistras Group SAS |  | France
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 LLC |  | Delaware
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.