Mistras Group, Inc.
A global provider of technology-enabled asset integrity and testing services, Mistras Group checks the health of critical equipment and infrastructure. Its teams perform non-destructive testing (NDT), pipeline inspections, and in-house lab work, with the OneSuite cloud platform pulling asset data into predictive analytics and its PCMS software used by about half of U.S. refiners. Customers span oil & gas, aerospace & defense, power generation, and civil infrastructure.
The Reporting Persons acquired, and presently beneficially own, shares of the issuer's common stock for investment purposes. None of the Reporting Persons currently has any plans or proposals that would result in or relate to any of the transactions or changes listed in Items 4(a) through 4(j) of Schedule 13D. However, as part of their ongoing evaluation of their investment and investment alternatives, the Reporting Persons may consider such matters and, subject to applicable law, may formulate a plan with respect to such matters or make formal proposals to the board of directors of the issuer, other stockholders of the issuer, or other third parties regarding such matters. The Reporting Persons reserve the right to acquire additional securities of the issuer in the open markets, in privately negotiated transactions (which may be with the issuer or with third parties) or otherwise, to dispose of all or a portion of their holdings of securities of the issuer, or to change their intention with respect to any or all of the matters referred to in this Item 4.
The Reporting Persons acquired, and presently beneficially own, shares of the issuer's common stock for investment purposes. None of the Reporting Persons currently has any plans or proposals that would result in or relate to any of the transactions or changes listed in Items 4(a) through 4(j) of Schedule 13D. However, as part of their ongoing evaluation of their investment and investment alternatives, the Reporting Persons may consider such matters and, subject to applicable law, may formulate a plan with respect to such matters or make formal proposals to the board of directors of the issuer, other stockholders of the issuer, or other third parties regarding such matters. The Reporting Persons reserve the right to acquire additional securities of the issuer in the open markets, in privately negotiated transactions (which may be with the issuer or with third parties) or otherwise, to dispose of all or a portion of their holdings of securities of the issuer, or to change their intention with respect to any or all of the matters referred to in this Item 4.
| Holder | Schedule | % of class | Shares | Filed |
|---|---|---|---|---|
| Aspasia Felice Vahaviolos | 13G/APassive | 19.2% | 6.11M | Aug 13, 2026 |
| Stephanie Foglia | 13D/AActivist | 18.6% | 5.92M | Jun 12, 2026 |
The Reporting Persons acquired, and presently beneficially own, shares of the issuer's common stock for investment purposes. None of the Reporting Persons currently has any plans or proposals that would result in or relate to any of the transactions or changes listed in Items 4(a) through 4(j) of Schedule 13D. However, as part of their ongoing evaluation of their investment and investment alternatives, the Reporting Persons may consider such matters and, subject to applicable law, may formulate a plan with respect to such matters or make formal proposals to the board of directors of the issuer, other stockholders of the issuer, or other third parties regarding such matters. The Reporting Persons reserve the right to acquire additional securities of the issuer in the open markets, in privately negotiated transactions (which may be with the issuer or with third parties) or otherwise, to dispose of all or a portion of their holdings of securities of the issuer, or to change their intention with respect to any or all of the matters referred to in this Item 4. | ||||
| 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos | 13D/AActivist | 13.55% | 4.31M | Jun 12, 2026 |
The Reporting Persons acquired, and presently beneficially own, shares of the issuer's common stock for investment purposes. None of the Reporting Persons currently has any plans or proposals that would result in or relate to any of the transactions or changes listed in Items 4(a) through 4(j) of Schedule 13D. However, as part of their ongoing evaluation of their investment and investment alternatives, the Reporting Persons may consider such matters and, subject to applicable law, may formulate a plan with respect to such matters or make formal proposals to the board of directors of the issuer, other stockholders of the issuer, or other third parties regarding such matters. The Reporting Persons reserve the right to acquire additional securities of the issuer in the open markets, in privately negotiated transactions (which may be with the issuer or with third parties) or otherwise, to dispose of all or a portion of their holdings of securities of the issuer, or to change their intention with respect to any or all of the matters referred to in this Item 4. | ||||
| Mill Road Capital III, L.P. | 13D/AActivist | 5.9% | 1.87M | Apr 23, 2026 |
| Mill Road Capital III GP LLC | 13D/AActivist | 5.9% | 1.87M | Apr 23, 2026 |
| Thomas E. Lynch | 13D/AActivist | 5.9% | 1.87M | Apr 23, 2026 |
| Kristy Kyriakopoulos | 13G/APassive | 5.12% | 1.62M | Mar 31, 2026 |
| Dimensional Fund Advisors LP | 13GPassive | 5.2% | 1.62M | Jul 15, 2025 |