MG · Mistras Group, Inc. · Insider Trading
10 customers — 36% of revenue (the year ended December 31, 2025)
“Taken as a group, our top ten customers were responsible for approximately 36%, 36%, and 35% of our revenues for the years ended December 31, 2025, 2024 and 2023, respectively.”
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Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 4 and 5. Form 3 supplies initial ownership rather than a trade; Form 4 must be filed within two business days of the trade.
| Date | Insider | Role | Type | Security | Shares |
|---|---|---|---|---|---|
| 2026-09-20 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. |
Common Stock
|
662 |
| 2026-09-18 | Coggins Eileen Mary |
EVP, General Counsel |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. |
Common Stock
|
1,636 |
| 2026-09-10 | Vahaviolos Aspasia Felice |
10% Owner |
Gift↑
Filing footnotes — Common Stock (Direct)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") to the reporting person pursuant to the terms of the GRAT. The amount was adjusted retroactively to reflect a reduction of 21,142 shares due to a reconciliation of the amounts previously reported against the reporting person's internal records. Amended solely to correct a clerical error in the amount previously reported in Column 5. |
Common Stock
|
387,093 |
| 2026-09-10 | Foglia Stephanie Athena |
10% Owner |
Gift↓
Filing footnotes — Common Stock (Indirect)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") pursuant to its terms. The reporting person is the trustee for the GRAT and holds sole power over the voting and disposition of the issuer's common stock held by the GRAT. The reporting person disclaims beneficial ownership of these shares except to the extent of her pecuniary interest therein. |
Common Stock
(I)
|
387,093 |
| 2026-09-08 | SHUMAN-FABBRI NATALIA |
Director, President and CEO |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. |
Common Stock
|
2,410 |
| 2026-06-10 | Foglia Stephanie Athena |
10% Owner |
Gift↓
Filing footnotes — Common Stock (Indirect)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") pursuant to its terms. The reporting person is the trustee for the GRAT and holds sole power over the voting and disposition of the issuer's common stock held by the GRAT. The reporting person disclaims beneficial ownership of these shares except to the extent of her pecuniary interest therein. |
Common Stock
(I)
|
411,875 |
| 2026-06-10 | Vahaviolos Aspasia Felice |
10% Owner |
Gift↑
Filing footnotes — Common Stock (Direct)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") to the reporting person pursuant to the terms of the GRAT. |
Common Stock
|
411,875 |
| 2026-05-19 | PIZZI CHARLES P |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for director fees. |
Common Stock
|
6,862 |
| 2026-05-19 | Lohmeier Michelle |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for Director fees. |
Common Stock
|
6,862 |
| 2026-05-19 | GLANTON RICHARD H |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for director fees. |
Common Stock
|
6,862 |
| 2026-05-19 | FORESE JAMES J |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for director fees. |
Common Stock
|
6,862 |
| 2026-05-19 | DEBENEDICTIS NICHOLAS |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for director fees. |
Common Stock
|
6,862 |
| 2026-04-27 | Foglia Stephanie Athena |
10% Owner |
Gift↓
Filing footnotes — Common Stock (Indirect)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") pursuant to its terms. The reporting person is the trustee for the GRAT and holds sole power over the voting and disposition of the issuer's common stock held by the GRAT. The reporting person disclaims beneficial ownership of these shares except to the extent of her pecuniary interest therein. |
Common Stock
(I)
|
528,672 |
| 2026-04-17 | Foglia Stephanie Athena |
10% Owner |
Sell↓
|
Common Stock
(I)
|
1,000 |
| 2026-03-26 | Hammad Hanei Wail |
EVP & Chief Operating Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units. |
Common Stock
|
2,865 |
| 2026-03-22 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units. |
Common Stock
|
1,367 |
| 2026-03-16 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units. |
Common Stock
|
2,239 |
| 2026-03-07 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of performance-based restricted stock units. |
Common Stock
|
2,540 |
| 2026-03-04 | Hammad Hanei Wail |
EVP & Chief Operating Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units, |
Common Stock
|
337 |
| 2026-03-04 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units. |
Common Stock
|
184 |
| 2026-03-04 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
Filing footnotes — Common Stock (Direct)
Transaction represents shares withheld to pay taxes upon vesting of restricted stock units. |
Common Stock
|
698 |
| 2026-03-04 | Stamatakis Manuel N. |
Director, Executive Chairman |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units that will vest 100% on the first anniversary date of the grant. |
Common Stock
|
814 |
| 2026-03-03 | Foglia Stephanie Athena |
10% Owner |
Sell↓
|
Common Stock
(I)
|
1,000 |
| 2026-02-28 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax↓
|
Common Stock
|
862 |
| 2026-02-28 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax↓
|
Common Stock
|
655 |
| 2026-02-28 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
|
Common Stock
|
1,303 |
| 2026-02-25 | Prajzner Edward J |
Sr. EVP and CFO |
Award↑
|
Common Stock
|
37,202 |
| 2026-02-25 | Stamatakis Manuel N. |
Director, Executive Chairman |
Award↑
|
Common Stock
|
86,310 |
| 2026-02-25 | Hammad Hanei Wail |
EVP & Chief Operating Officer |
Award↑
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units for payment of a performance award earned, which vest on December 31 in 2026, 2027, 2028 and 2029. |
Common Stock
|
29,762 |
| 2026-02-25 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Award↑
|
Common Stock
|
19,905 |
| 2026-02-25 | SHUMAN-FABBRI NATALIA |
Director, President and CEO |
Award↑
|
Common Stock
|
101,190 |
| 2026-02-25 | Coggins Eileen Mary |
EVP, General Counsel |
Award↑
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units for payment of a performance award earned, which vest 25% on December 31 in 2026, 2027, 2028 and 2029. |
Common Stock
|
7,242 |
| 2026-02-03 | Foglia Stephanie Athena |
10% Owner |
Sell↓
|
Common Stock
(I)
|
1,000 |
| 2026-01-05 | Prajzner Edward J |
Sr. EVP and CFO |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. |
Common Stock
|
2,699 |
| 2026-01-05 | Foglia Stephanie Athena |
10% Owner |
Sell↓
|
Common Stock
(I)
|
1,000 |
| 2026-01-02 | Stamatakis Manuel N. |
Director, Executive Chairman |
Award↑
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units that will vest 100% on the first anniversary date of the grant. |
Common Stock
|
40,000 |
| 2025-12-31 | Vahaviolos Aspasia Felice |
10% Owner |
Gift↓
|
Common Stock
|
5,251,358 |
| 2025-12-31 | Vahaviolos Aspasia Felice |
10% Owner |
Gift↑
Filing footnotes — Common Stock (Direct)
Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") to the reporting person pursuant to the terms of the GRAT. |
Common Stock
|
528,672 |
| 2025-12-04 | PIZZI CHARLES P |
Director |
Gift↓
|
Common Stock
|
2,150 |
| 2025-09-24 | D'Alterio Gennaro A. |
EVP, Chief Commercial Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. |
Common Stock
|
475 |
| 2025-09-15 | Coggins Eileen Mary |
EVP, General Counsel |
Buy↑
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units that will vest 100% on the first anniversary date of the grant. |
Common Stock
|
15,000 |
| 2025-09-15 | Coggins Eileen Mary |
EVP, General Counsel |
Award↑
Filing footnotes — Right to buy (Direct)
This corrects the transaction code which was incorrectly filed originally as "P" (Purchase) rather than as "A" (Award) which these transactions represent. |
Right to buy
|
25,000 |
| 2025-09-15 | Coggins Eileen Mary |
EVP, General Counsel |
Award↑
Filing footnotes — Common Stock (Direct)
This corrects the transaction code which was incorrectly filed originally as "P" (Purchase) rather than as "A" (Award) which these transactions represent. Represents an award of restricted stock units that will vest 100% on the first anniversary date of the grant. |
Common Stock
|
15,000 |
| 2025-09-15 | Coggins Eileen Mary |
EVP, General Counsel |
Buy↑
|
Stock Options (Right to Buy)
|
25,000 |
| 2025-09-08 | SHUMAN-FABBRI NATALIA |
Director, President and CEO |
Award↑
Filing footnotes — Common Stock (Direct)
Represents an award of restricted stock units that will vest 100% on the first anniversary date of the grant. |
Common Stock
|
25,000 |
| 2025-09-08 | SHUMAN-FABBRI NATALIA |
Director, President and CEO |
Award↑
|
Stock Options (Right to Buy)
|
35,000 |
| 2025-07-02 | Vahaviolos Aspasia Felice |
10% Owner |
Inheritance↑
|
Common Stock
|
2,217,087 |
| 2025-07-02 | Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust |
10% Owner |
Gift↓
Filing footnotes — Common Stock (Direct)
This represents the final distribution of the shares in the trust and after which the trust was terminated. |
Common Stock
|
4,685,578 |
| 2025-06-05 | Stamatakis Manuel N. |
Director, Executive Chairman |
Buy↑
Filing footnotes — Common Stock (Direct)
The price on this line represents the weighted average price for the transactions reported on this line. The range of prices for the transactions reported on this line was $7.69 to $7.74. Upon request by the Commission staff or a security holder of the issuer, the full information regarding the number of shares purchased at each separate price shall be provided. The information has been provided to the issuer. |
Common Stock
|
10,000 |
| 2025-05-19 | PIZZI CHARLES P |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
Transaction represents an award of stock for director fees. |
Common Stock
|
14,447 |