| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13D/A | 2024-02-14 | Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust | Mistras Group, Inc. | 6,734,718 | 22.0% | EDGAR |
| SC 13D | 2024-02-14 | Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust | Mistras Group, Inc. | 6,734,718 | 22.0% | EDGAR |
| SC 13G/A | 2024-02-14 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 1,841,559 | 6.0% | EDGAR |
| SC 13G/A | 2024-02-14 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 1,841,559 | 6.0% | EDGAR |
| SC 13G | 2023-02-07 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 8,606,877 | 28.8% | EDGAR |
| SC 13D | 2023-01-26 | Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust | Mistras Group, Inc. | 6,734,718 | 22.5% | EDGAR |
| SC 13G | 2022-02-09 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 8,606,877 | 29.1% | EDGAR |
| SC 13G/A | 2021-02-12 | DIMENSIONAL FUND ADVISORS LP | Mistras Group, Inc. | 1,135,711 | 3.9% | EDGAR |
| SC 13G/A | 2021-02-11 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 8,609,193 | 29.4% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | Mistras Group, Inc. | 808,586 | 2.8% | EDGAR |
| SC 13G/A | 2020-04-30 | BERNZOTT CAPITAL ADVISORS | Mistras Group, Inc. | 1,875 | 0.0% | EDGAR |
| SC 13G/A | 2020-02-14 | Vahaviolos Sotirios J. | Mistras Group, Inc. | 10,350,705 | 35.7% | EDGAR |
| SC 13G | 2020-02-13 | Mistras Group, Inc. | Mistras Group, Inc. | 10,350,705 | 35.7% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | Mistras Group, Inc. | 1,665,944 | 5.8% | EDGAR |
| SC 13G | 2020-02-12 | DIMENSIONAL FUND ADVISORS LP | Mistras Group, Inc. | 1,459,112 | 5.0% | EDGAR |
| SC 13G/A | 2020-02-04 | BERNZOTT CAPITAL ADVISORS | Mistras Group, Inc. | 1,903,332 | 6.6% | EDGAR |
| SC 13G/A | 2019-08-20 | BERNZOTT CAPITAL ADVISORS | Mistras Group, Inc. | 2,174,456 | 7.6% | EDGAR |
| SC 13G/A | 2019-08-12 | WELLINGTON MANAGEMENT GROUP LLP | Mistras Group, Inc. | 1,280,577 | 4.5% | EDGAR |
| SC 13G/A | 2019-02-14 | Broad Run Investment Management, LLC | Mistras Group, Inc. | 979,716 | 3.4% | EDGAR |
| SC 13G/A | 2019-02-12 | WELLINGTON MANAGEMENT GROUP LLP | Mistras Group, Inc. | 2,855,007 | 10.0% | EDGAR |