| Date Filed | Type | Description |
| 10/13/2023 |
8-K
| Quarterly results |
| 10/10/2023 |
8-K
| Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements... |
| 08/07/2023 |
10-Q
| Quarterly Report for the period ended June 30, 2023 |
| 08/02/2023 |
8-K/A
| Quarterly results |
| 08/02/2023 |
8-K
| Quarterly results |
| 05/24/2023 |
8-K
| Submission of Matters to a Vote of Security Holders |
| 05/05/2023 |
10-Q
| Quarterly Report for the period ended March 31, 2023 |
| 05/05/2023 |
10-K/A
| Annual Report for the period ended December 31, 2022 [amend] |
| 04/03/2023 |
8-K
| Changes in Registrant's Certifying Accountant, Financial Statements and Exhibits |
| 03/15/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
| 03/08/2023 |
8-K
| Quarterly results |
| 02/09/2023 |
8-K
| Quarterly results |
| 02/07/2023 |
SC 13G
| Vahaviolos Sotirios J. reports a 28.8% stake in Mistras Group, Inc. |
| 01/26/2023 |
SC 13D
| Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust reports a 22.5% stake in Mistras Group, Inc. |
| 11/07/2022 |
10-Q
| Quarterly Report for the period ended September 30, 2022 |
| 11/02/2022 |
8-K
| Quarterly results |
| 08/05/2022 |
S-8
| Form S-8 - Securities to be offered to employees in employee benefit plans: |
| 08/05/2022 |
10-Q
| Quarterly Report for the period ended June 30, 2022 |
| 08/03/2022 |
8-K
| Quarterly results |
| 08/01/2022 |
8-K
| Entry into a Material Definitive Agreement, Regulation FD Disclosure |
| 06/24/2022 |
SD
| Form SD - Specialized disclosure report: |
| 05/25/2022 |
8-K
| Quarterly results |
| 05/06/2022 |
10-Q
| Quarterly Report for the period ended March 31, 2022 |
| 05/03/2022 |
8-K
| Quarterly results |
| 04/13/2022 |
DEFA14A
| Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material: |
| 04/13/2022 |
8-K
| Regulation FD Disclosure Interactive Data |
| 04/13/2022 |
DEF 14A
| Form DEF 14A - Other definitive proxy statements: |
| 03/14/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 03/09/2022 |
8-K
| Quarterly results |
| 02/08/2022 |
SC 13G
| Vahaviolos Sotirios J. reports a 29.1% stake in Mistras Group, Inc. |
| 11/03/2021 |
10-Q
| Quarterly Report for the period ended September 30, 2021 |
| 11/02/2021 |
8-K
| Quarterly results |
| 08/03/2021 |
10-Q
| Quarterly Report for the period ended June 30, 2021 |
| 08/02/2021 |
8-K
| Quarterly results |
|