| | | | | | | | |
| 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 |