| 10/07/2026 3:20 PM | Mistras Group (1436126) Issuer Vahaviolos Aspasia Felice (2082296) Reporting | Form 4/A | |
| 10/07/2026 3:05 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 09/22/2026 9:04 AM | D'Alterio Gennaro A. (1457461) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/21/2026 3:05 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 09/18/2026 5:35 PM | Coggins Eileen Mary (2087458) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/18/2026 4:22 PM | Mill Road Capital III, L.P. (1767199) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 09/18/2026 3:26 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:26 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:27 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:27 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:27 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
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| 09/18/2026 3:27 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:08 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 09/18/2026 3:05 PM | Mistras Group (1436126) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 09/14/2026 8:28 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 09/14/2026 8:29 PM | 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos (2102046) Reporting Foglia Stephanie Athena (2082289) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/14/2026 8:29 PM | Mistras Group (1436126) Issuer Vahaviolos Aspasia Felice (2082296) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 09/09/2026 7:17 PM | Mistras Group (1436126) Issuer SHUMAN-FABBRI NATALIA (1585776) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 08/13/2026 3:21 PM | Mistras Group (1436126) Subject Vahaviolos Aspasia Felice (2082296) Filed by | Form SCHEDULE 13G/A | |
| 08/10/2026 4:10 PM | Mistras Group (1436126) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 08/10/2026 4:16 PM | Mistras Group (1436126) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 06/18/2026 11:22 AM | Mistras Group (1436126) Filer | Form S-8 Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans | |
| 06/12/2026 6:15 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 06/12/2026 3:51 PM | Mistras Group (1436126) Issuer Vahaviolos Aspasia Felice (2082296) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/12/2026 3:52 PM | 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos (2102046) Reporting Foglia Stephanie Athena (2082289) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 06/04/2026 3:12 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 06/04/2026 3:05 PM | Foglia Stephanie Athena (2082289) Reporting Mistras Group (1436126) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 06/04/2026 3:07 PM | 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos (2102046) Reporting Foglia Stephanie Athena (2082289) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/27/2026 2:13 PM | Mistras Group (1436126) Filer | Form SD Specialized Disclosure Report | |
| 05/21/2026 2:37 PM | FORESE JAMES J (1179521) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/21/2026 2:42 PM | GLANTON RICHARD H (1060493) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/21/2026 2:34 PM | Lohmeier Michelle (1645009) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/21/2026 12:55 PM | Mistras Group (1436126) Issuer PIZZI CHARLES P (1192898) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 05/20/2026 3:30 PM | Mistras Group (1436126) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 05/07/2026 1:52 PM | Mistras Group (1436126) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 05/05/2026 4:17 PM | Mistras Group (1436126) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |
| 04/23/2026 7:00 PM | Mill Road Capital III, L.P. (1767199) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D/A | |
| 04/07/2026 8:40 PM | Mistras Group (1436126) Filer | Form ARS | |
| 04/07/2026 4:24 PM | Mistras Group (1436126) Filer | Form DEF 14A | |
| 04/07/2026 4:25 PM | Mistras Group (1436126) Filer | Form DEFA14A | |
| 03/31/2026 3:17 PM | Mistras Group (1436126) Subject Vahaviolos Aspasia Felice (2082296) Filed by | Form SCHEDULE 13G | |
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| 03/31/2026 3:12 PM | Foglia Stephanie Athena (2082289) Filed by Mistras Group (1436126) Subject | Form SCHEDULE 13D | |
| 03/26/2026 3:09 PM | Hammad Hanei Wail (2018025) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/23/2026 12:13 PM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/17/2026 2:37 PM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/11/2026 1:36 PM | Mistras Group (1436126) Filer | Form 10-K Annual report pursuant to Section 13 or 15(d) | |
| 03/10/2026 2:26 PM | Mistras Group (1436126) Issuer Stamatakis Manuel N. (1473735) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/10/2026 10:21 AM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/10/2026 9:25 AM | D'Alterio Gennaro A. (1457461) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/09/2026 8:23 PM | Hammad Hanei Wail (2018025) Reporting Mistras Group (1436126) Issuer | Form 4/A | |
| 03/06/2026 7:34 AM | Mistras Group (1436126) Issuer SHUMAN-FABBRI NATALIA (1585776) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/06/2026 7:02 AM | Mistras Group (1436126) Issuer Stamatakis Manuel N. (1473735) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/06/2026 6:44 AM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/04/2026 8:05 PM | Hammad Hanei Wail (2018025) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/04/2026 5:06 PM | Coggins Eileen Mary (2087458) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 03/03/2026 7:49 PM | D'Alterio Gennaro A. (1457461) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 02/27/2026 4:25 PM | Mistras Group (1436126) Issuer Vahaviolos Aspasia Felice (2082296) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 02/27/2026 4:26 PM | 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos (2102046) Reporting Mistras Group (1436126) Issuer | Form 3 Initial statement of beneficial ownership of securities | |
| 01/09/2026 1:55 PM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4/A | |
| 01/09/2026 2:01 PM | Mistras Group (1436126) Issuer Stamatakis Manuel N. (1473735) Reporting | Form 4/A | |
| 01/05/2026 3:17 PM | Mistras Group (1436126) Issuer Stamatakis Manuel N. (1473735) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 01/05/2026 3:19 PM | Mistras Group (1436126) Issuer Prajzner Edward J (1361681) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 12/05/2025 3:33 PM | Mistras Group (1436126) Issuer PIZZI CHARLES P (1192898) Reporting | Form 4 Statement of changes in beneficial ownership of securities | |
| 12/04/2025 5:05 PM | D'Alterio Gennaro A. (1457461) Reporting Mistras Group (1436126) Issuer | Form 4 Statement of changes in beneficial ownership of securities | |
| 11/06/2025 1:28 PM | Mistras Group (1436126) Filer | Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
| 11/04/2025 4:02 PM | Mistras Group (1436126) Filer | Form 8-K Current report pursuant to Section 13 or 15(d) | |