Through the 90-day period concluding February 19, 2026, Mistras's top three insider stakeholders include TenPercentOwner Aspasia Felice Vahaviolos (6.11Mn shares), Director Sotirios J. Vahaviolos (3.89Mn shares), President And Ceo Dennis Bertolotti (424.36K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Aspasia Felice Vahaviolos | 6,105,650 | 10 Sep, 2025 | |
| Sotirios J. Vahaviolos | 3,890,699 | 03 May, 2024 | |
| Dennis Bertolotti | President And Ceo | 424,358 | 30 Mar, 2023 |
| Manuel N. Stamatakis | Executive Chairman | 424,299 | 09 Jan, 2026 |
| Nicholas Debenedictis | 266,958 | 21 May, 2025 | |
| Michael J. Lange | Senior Evp | 240,515 | 25 Sep, 2024 |
| Jonathan H Wolk | Sr. Evp And Coo | 194,575 | 03 Jan, 2023 |
| James J Forese | 170,181 | 21 May, 2025 | |
| Edward J Prajzner | Sr. Evp And Cfo | 119,021 | 09 Jan, 2026 |
| John Anthony Smith | Executive Vice President | 100,447 | 05 Apr, 2024 |
| Michelle Lohmeier | 92,361 | 21 May, 2025 | |
| Michael C Keefe | Evp And General Counsel | 91,558 | 20 Mar, 2025 |
| Charles P Pizzi | 66,618 | 05 Dec, 2025 | |
| Hanei Wail Hammad | Evp & Chief Operating Officer | 64,979 | 06 Mar, 2025 |
| Richard H Glanton | 64,379 | 21 May, 2025 | |
| Gennaro A. D'Alterio | Evp And Chief Commercial Officer | 29,035 | 04 Dec, 2025 |
| Natalia Shuman-Fabbri | President And Ceo | 25,000 | 10 Sep, 2025 |
| Eileen Mary Coggins | Evp & Chief Legal Officer | 15,000 | 01 Oct, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 05 Jan, 2026 | Edward J Prajzner | Common Stock | D | 2,699 | $12.65 | 119,021 | D | F |
| 05 Jan, 2026 | Edward J Prajzner | Common Stock | D | 2,699 | $12.65 | 119,021 | D | F |
| 02 Jan, 2026 | Manuel N. Stamatakis | Common Stock | A | 40,000 | $0.00 | 424,299 | D | A |
| 02 Jan, 2026 | Manuel N. Stamatakis | Common Stock | A | 40,000 | $0.00 | 424,299 | D | A |
| 04 Dec, 2025 | Charles P Pizzi | Common Stock | D | 2,150 | $0.00 | 66,618 | D | G |
| 04 Dec, 2025 | Charles P Pizzi | - | - | 66,618 | D | |||
| 24 Sep, 2025 | Gennaro A. D'Alterio | Common Stock | D | 475 | $9.53 | 29,035 | D | F |
| 24 Sep, 2025 | Gennaro A. D'Alterio | - | - | 29,035 | D | |||
| 15 Sep, 2025 | Eileen Mary Coggins | - | - | 15,000 | D | |||
| 15 Sep, 2025 | Eileen Mary Coggins | Common Stock | A | 15,000 | $9.55 | 15,000 | D | P |
| 15 Sep, 2025 | Eileen Mary Coggins | Common Stock | A | 15,000 | $0.00 | 15,000 | D | A |
| 08 Sep, 2025 | Natalia Shuman-Fabbri | Common Stock | A | 25,000 | $0.00 | 25,000 | D | A |
| 08 Sep, 2025 | Natalia Shuman-Fabbri | - | - | 25,000 | D | |||
| 02 Jul, 2025 | Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust Sotirios | - | - | 0 | D | |||
| 02 Jul, 2025 | Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust Sotirios | Common Stock | D | 4,685,578 | $0.00 | 0 | D | G |
| 02 Jul, 2025 | Aspasia Felice Vahaviolos | Common Stock | A | 2,217,087 | $0.00 | 6,105,650 | D | W |
| 05 Jun, 2025 | Manuel N. Stamatakis | - | - | 384,299 | D | |||
| 05 Jun, 2025 | Manuel N. Stamatakis | Common Stock | A | 10,000 | $7.71 | 384,299 | D | P |
| 19 May, 2025 | Richard H Glanton | Common Stock | A | 14,447 | $0.00 | 61,569 | D | A |
| 19 May, 2025 | Richard H Glanton | - | - | 61,569 | D |