Across the past 12 months, Mistras insiders reported no open-market purchases or sales.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Stephanie Athena Foglia | TenPercentOwner | 0 | 3,923,718 | 3,923,718 | 31.1% | 14 Sep, 2026 |
| 2 | Sotirios J. Vahaviolos | Executive Chairman | 3,890,699 | 0 | 3,890,699 | 30.9% | 03 May, 2024 |
| 3 | Aspasia Felice Vahaviolos | TenPercentOwner | 2,160,790 | 0 | 2,160,790 | 17.2% | 07 Oct, 2026 |
| 4 | Manuel N. Stamatakis | Executive Chairman | 509,795 | 0 | 509,795 | 4.0% | 10 Mar, 2026 |
| 5 | Dennis Bertolotti | President And Ceo | 424,358 | 0 | 424,358 | 3.4% | 30 Mar, 2023 |
| 6 | Nicholas Debenedictis | Director | 248,820 | 0 | 248,820 | 2.0% | 21 May, 2026 |
| 7 | Michael J. Lange | Senior Evp | 240,515 | 0 | 240,515 | 1.9% | 25 Sep, 2024 |
| 8 | Jonathan H Wolk | Sr. Evp And Coo | 194,575 | 0 | 194,575 | 1.5% | 03 Jan, 2023 |
| 9 | James J Forese | Director | 177,043 | 0 | 177,043 | 1.4% | 21 May, 2026 |
| 10 | Edward J Prajzner | Sr. Evp And Cfo | 148,076 | 0 | 148,076 | 1.2% | 23 Mar, 2026 |
| 11 | Natalia Shuman-Fabbri | President And Ceo | 123,780 | 0 | 123,780 | 1.0% | 09 Sep, 2026 |
| 12 | John Anthony Smith | Executive Vice President | 100,447 | 0 | 100,447 | 0.8% | 05 Apr, 2024 |
| 13 | Michelle Lohmeier | Director | 99,223 | 0 | 99,223 | 0.8% | 21 May, 2026 |
| 14 | Michael C Keefe | Evp, General Counsel | 91,558 | 0 | 91,558 | 0.7% | 20 Mar, 2025 |
| 15 | Charles P Pizzi | Director | 73,480 | 0 | 73,480 | 0.6% | 20 May, 2026 |
| 16 | Richard H Glanton | Director | 68,431 | 0 | 68,431 | 0.5% | 21 May, 2026 |
| 17 | Hanei Wail Hammad | Evp Chief Operating Officer | 61,777 | 0 | 61,777 | 0.5% | 26 Mar, 2026 |
| 18 | Gennaro A. D'Alterio | Evp, Chief Commercial Officer | 46,577 | 0 | 46,577 | 0.4% | 22 Sep, 2026 |
| 19 | Eileen Mary Coggins | Chief Legal Officer | 13,364 | 0 | 13,364 | 0.1% | 18 Sep, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 10 Sep, 2026 | Aspasia Felice Vahaviolos | TenPercentOwner | Acquired G | 387,093 | $0.00 | $0 | 2,160,790 | Direct |
| 20 Sep, 2026 | Gennaro A. D'Alterio | Evp, Chief Commercial Officer | Disposed F | 662 | $20.75 | $13.74K | 46,577 | Direct |
| 18 Sep, 2026 | Eileen Mary Coggins | Chief Legal Officer | Disposed F | 1,636 | $19.66 | $32.16K | 13,364 | Direct |
| 10 Sep, 2026 | Aspasia Felice Vahaviolos | TenPercentOwner | Acquired G | 387,093 | $0.00 | $0 | 2,154,541 | Direct |
| 10 Sep, 2026 | Stephanie Athena Foglia | TenPercentOwner | Disposed G | 387,093 | $0.00 | $0 | 3,923,718 | Indirect |
| 08 Sep, 2026 | Natalia Shuman-Fabbri | President And Ceo | Disposed F | 2,410 | $19.42 | $46.80K | 123,780 | Direct |
| 10 Jun, 2026 | Stephanie Athena Foglia | TenPercentOwner | Disposed G | 411,875 | $0.00 | $0 | 4,310,811 | Indirect |
| 10 Jun, 2026 | Aspasia Felice Vahaviolos | TenPercentOwner | Acquired G | 411,875 | $0.00 | $0 | 1,794,839 | Direct |
| 19 May, 2026 | James J Forese | Director | Acquired A | 6,862 | $0.00 | $0 | 177,043 | Direct |
| 19 May, 2026 | Michelle Lohmeier | Director | Acquired A | 6,862 | $0.00 | $0 | 99,223 | Direct |
| 19 May, 2026 | Richard H Glanton | Director | Acquired A | 6,862 | $0.00 | $0 | 68,431 | Direct |
| 19 May, 2026 | Nicholas Debenedictis | Director | Acquired A | 6,862 | $0.00 | $0 | 248,820 | Direct |
| 19 May, 2026 | Charles P Pizzi | Director | Acquired A | 6,862 | $0.00 | $0 | 73,480 | Direct |
| 26 Mar, 2026 | Hanei Wail Hammad | Evp Chief Operating Officer | Disposed F | 2,865 | $15.10 | $43.26K | 61,777 | Direct |
| 22 Mar, 2026 | Edward J Prajzner | Sr. Evp And Cfo | Disposed F | 1,367 | $14.05 | $19.21K | 148,076 | Direct |
| 16 Mar, 2026 | Edward J Prajzner | Sr. Evp And Cfo | Disposed F | 2,239 | $14.61 | $32.71K | 149,443 | Direct |
| 04 Mar, 2026 | Hanei Wail Hammad | Evp Chief Operating Officer | Disposed F | 337 | $15.68 | $5.28K | 64,642 | Direct |
| 04 Mar, 2026 | Gennaro A. D'Alterio | Evp, Chief Commercial Officer | Disposed F | 184 | $15.68 | $2.89K | 47,239 | Direct |
| 04 Mar, 2026 | Edward J Prajzner | Sr. Evp And Cfo | Disposed F | 698 | $15.68 | $10.94K | 154,222 | Direct |
| 04 Mar, 2026 | Manuel N. Stamatakis | Executive Chairman | Disposed F | 814 | $15.68 | $12.76K | 509,795 | Direct |