Mistras Group, Inc. (MG) has 20 known insider and institutional holders on record. The largest holder is Vahaviolos Sotirios J. with 10,352,803 shares. Other notable holders include 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos and Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust.
Over the last 12 months, insiders have made 39 transactions in MG stock — 17 buys (valued at $220.35K) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
MG Insider Ownership
Top Holder
Vahaviolos Sotirios J.
10,352,803 shares
Buys (12 mo)
17
$220.35K value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Vahaviolos Sotirios J. |
10 Percent Owner |
10,352,803 |
2024-08-19 |
|
| 2 |
2025 Irrevocable Two-year Grantor Retained Annuity Trust Of Aspasia F. Vahaviolos |
10 Percent Owner |
5,251,358 |
2026-02-27 |
|
| 3 |
Sotirios Vahaviolos January 2023 2-year Grantor Retained Annuity Trust |
10 Percent Owner |
4,685,578 |
2024-05-03 |
|
| 4 |
Burgess Elizabeth |
Director |
965,594 |
2010-04-22 |
|
| 5 |
Vahaviolos Aspasia Felice |
10 Percent Owner |
854,292 |
2026-02-27 |
|
| 6 |
Stamatakis Manuel N. |
Executive Chairman |
509,795 |
2026-03-10 |
|
| 7 |
Bertolotti Dennis |
President and CEO |
424,358 |
2023-03-30 |
|
| 8 |
Debenedictis Nicholas |
Director |
241,958 |
2025-05-21 |
|
| 9 |
Lange Michael J. |
Senior EVP |
240,515 |
2024-09-25 |
|
| 10 |
Wolk Jonathan H |
Sr. EVP and COO |
194,575 |
2023-01-03 |
|
| 11 |
Forese James J |
Director |
170,181 |
2025-05-21 |
|
| 12 |
Carlos Mark F. |
Group EVP, Products & Systems |
163,120 |
2016-08-18 |
|
| 13 |
Cole Phillip T. |
Group EVP, International |
160,950 |
2012-11-13 |
|
| 14 |
Prajzner Edward J |
Sr. EVP and CFO |
148,076 |
2026-03-23 |
|
| 15 |
Shuman-fabbri Natalia |
President and CEO |
126,190 |
2026-03-06 |
|
| 16 |
Smith John Anthony |
Executive Vice President |
100,447 |
2024-04-05 |
|
| 17 |
Lohmeier Michelle |
Director |
92,361 |
2025-05-21 |
|
| 18 |
Keefe Michael C |
EVP, General Counsel |
91,558 |
2025-03-20 |
|
| 19 |
Pizzi Charles P |
Director |
66,618 |
2025-12-05 |
|
| 20 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
61,777 |
2026-03-26 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-26 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
Tax Withholding of RSU |
2,865 |
$15.10 |
$43.26K |
| 2026-03-22 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
1,367 |
$14.05 |
$19.21K |
| 2026-03-16 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
2,239 |
$14.61 |
$32.71K |
| 2026-03-04 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
Tax Withholding of RSU |
337 |
$15.68 |
$5.28K |
| 2026-03-04 |
Stamatakis Manuel N. |
Executive Chairman |
Tax Withholding of RSU |
814 |
$15.68 |
$12.76K |
| 2026-03-04 |
D'alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax Withholding of RSU |
184 |
$15.68 |
$2.89K |
| 2026-03-07 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
2,540 |
$14.82 |
$37.64K |
| 2026-03-04 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
698 |
$15.68 |
$10.94K |
| 2025-03-25 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
Tax Withholding of RSU |
6,384 |
$10.79 |
$68.88K |
| 2026-02-25 |
Shuman-fabbri Natalia |
President and CEO |
RSU Award |
101,190 |
- |
- |
| 2026-02-25 |
Stamatakis Manuel N. |
Executive Chairman |
RSU Award |
86,310 |
- |
- |
| 2026-02-28 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
1,303 |
$15.28 |
$19.91K |
| 2026-02-25 |
Prajzner Edward J |
Sr. EVP and CFO |
RSU Award |
37,202 |
- |
- |
| 2026-02-25 |
Coggins Eileen Mary |
EVP, General Counsel |
RSU Award |
7,242 |
- |
- |
| 2026-02-25 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
RSU Award |
29,762 |
- |
- |
| 2025-03-25 |
Hammad Hanei Wail |
EVP & Chief Operating Officer |
Return of Shares |
6,384 |
$10.79 |
$68.88K |
| 2026-02-28 |
D'alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax Withholding of RSU |
862 |
$15.28 |
$13.17K |
| 2026-02-25 |
D'alterio Gennaro A. |
EVP, Chief Commercial Officer |
RSU Award |
19,905 |
- |
- |
| 2025-12-31 |
2025 Irrevocable Two-year Grantor Retained Annuity Trust Of Aspasia F. Vahaviolos |
10 Percent Owner |
Unknown |
- |
- |
- |
| 2025-12-31 |
Vahaviolos Aspasia Felice |
10 Percent Owner |
Gift (Given) |
5,251,358 |
- |
- |
| 2026-01-02 |
Stamatakis Manuel N. |
Executive Chairman |
RSU Award |
40,000 |
- |
- |
| 2026-01-05 |
Prajzner Edward J |
Sr. EVP and CFO |
Tax Withholding of RSU |
2,699 |
$12.65 |
$34.14K |
| 2025-12-04 |
Pizzi Charles P |
Director |
Gift (Given) |
2,150 |
- |
- |
| 2025-09-24 |
D'alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax Withholding of RSU |
475 |
$9.53 |
$4.53K |
| 2025-09-15 |
Coggins Eileen Mary |
EVP & Chief Legal Officer |
RSU Award |
15,000 |
- |
- |
