Mistras's top three insider shareholders as of May 30, 2026 are Sotirios J. Vahaviolos (Executive Chairman, 3.89Mn shares), Aspasia Felice Vahaviolos (TenPercentOwner, 854.29K shares), Manuel N. Stamatakis (Executive Chairman, 509.80K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Richard H Glanton | - | 61,569 | 0 | 21 May, 2025 |
| James J Forese | - | 170,181 | 0 | 21 May, 2025 |
| Charles P Pizzi | - | 66,618 | 0 | 05 Dec, 2025 |
| Nicholas Debenedictis | - | 241,958 | 0 | 21 May, 2025 |
| Jonathan H Wolk | Sr. Evp And Coo | 194,575 | 0 | 03 Jan, 2023 |
| Edward J Prajzner | Sr. Evp And Cfo | 148,076 | 0 | 23 Mar, 2026 |
| Michael C Keefe | Evp, General Counsel | 91,558 | 0 | 20 Mar, 2025 |
| Gennaro A. D'Alterio | Evp, Chief Commercial Officer | 47,239 | 0 | 10 Mar, 2026 |
| Sotirios J. Vahaviolos | Executive Chairman | 3,890,699 | 0 | 03 May, 2024 |
| Manuel N. Stamatakis | Executive Chairman | 509,795 | 0 | 10 Mar, 2026 |
| Michael J. Lange | Senior Evp | 240,515 | 0 | 25 Sep, 2024 |
| Dennis Bertolotti | President And Ceo | 424,358 | 0 | 30 Mar, 2023 |
| Natalia Shuman-Fabbri | President And Ceo | 126,190 | 0 | 06 Mar, 2026 |
| Michelle Lohmeier | - | 92,361 | 0 | 21 May, 2025 |
| John Anthony Smith | Executive Vice President | 100,447 | 0 | 05 Apr, 2024 |
| Hanei Wail Hammad | Evp Chief Operating Officer | 61,777 | 0 | 26 Mar, 2026 |
| Aspasia Felice Vahaviolos | - | 854,292 | 0 | 16 Feb, 2026 |
| Eileen Mary Coggins | Evp, General Counsel | 22,242 | 0 | 04 Mar, 2026 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 26 Mar, 2026 | Hanei Wail Hammad | Common Stock | D | 2,865 | $15.10 | 61,777 | D | F |
| 22 Mar, 2026 | Edward J Prajzner | Common Stock | D | 1,367 | $14.05 | 148,076 | D | F |
| 16 Mar, 2026 | Edward J Prajzner | Common Stock | D | 2,239 | $14.61 | 149,443 | D | F |
| 04 Mar, 2026 | Manuel N. Stamatakis | Common Stock | D | 814 | $15.68 | 509,795 | D | F |
| 04 Mar, 2026 | Gennaro A. D'Alterio | Common Stock | D | 184 | $15.68 | 47,239 | D | F |
| 04 Mar, 2026 | Hanei Wail Hammad | Common Stock | D | 337 | $15.68 | 64,642 | D | F |
| 04 Mar, 2026 | Edward J Prajzner | Common Stock | D | 698 | $15.68 | 154,222 | D | F |
| 04 Mar, 2026 | Manuel N. Stamatakis | Common Stock | D | 814 | $15.68 | 509,795 | D | F |
| 07 Mar, 2026 | Edward J Prajzner | Common Stock | D | 2,540 | $14.82 | 151,682 | D | F |
| 25 Feb, 2026 | Natalia Shuman-Fabbri | Common Stock | A | 101,190 | $0.00 | 126,190 | D | A |
| 25 Feb, 2026 | Natalia Shuman-Fabbri | Common Stock | A | 101,190 | $0.00 | 126,190 | D | A |
| 25 Feb, 2026 | Eileen Mary Coggins | Common Stock | A | 7,242 | $0.00 | 22,242 | D | A |
| 25 Feb, 2026 | Manuel N. Stamatakis | Common Stock | A | 86,310 | $0.00 | 510,609 | D | A |
| 25 Feb, 2026 | Manuel N. Stamatakis | Common Stock | A | 86,310 | $0.00 | 510,609 | D | A |
| 25 Feb, 2026 | Edward J Prajzner | Common Stock | A | 37,202 | $0.00 | 156,223 | D | A |
| 25 Feb, 2026 | Gennaro A. D'Alterio | Common Stock | A | 19,905 | $0.00 | 48,940 | D | A |
| 28 Feb, 2026 | Gennaro A. D'Alterio | Common Stock | D | 655 | $15.28 | 48,285 | D | F |
| 28 Feb, 2026 | Edward J Prajzner | Common Stock | D | 1,303 | $15.28 | 154,920 | D | F |
| 28 Feb, 2026 | Gennaro A. D'Alterio | Common Stock | D | 862 | $15.28 | 47,423 | D | F |
| 31 Dec, 2025 | Aspasia Felice Vahaviolos | Common Stock | D | 5,251,358 | $0.00 | 854,292 | D | G |