SCHEDULE: Mistras Group Insider Ownership Update

Stephanie Foglia and the 2025 Irrevocable GRAT of Aspasia F. Vahaviolos report a combined 18.60% beneficial ownership in Mistras Group, Inc.

Summary

• Stephanie Foglia and the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust (GRAT) of Aspasia F. Vahaviolos filed an amendment to their Schedule 13D.
• The reporting persons collectively beneficially own 5,917,135 shares of Mistras Group, Inc. common stock.
• This aggregate holding represents approximately 18.60% of the issuer's 31,816,681 outstanding shares as of May 7, 2026.
• The shares held by the Trust were acquired via a gift from Aspasia F. Vahaviolos on December 31, 2025.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral regulatory disclosure regarding ownership structure, indicating no immediate change in company operations or financial strategy.

Positives

• Significant alignment of interest between key personnel and the company through substantial equity ownership.
• The reporting persons maintain a long-term investment perspective regarding their holdings.

Negatives

• Concentrated ownership by related parties may influence corporate governance and strategic decision-making.

Risks

• Potential for future changes in investment intent, including the possibility of disposing of shares or making formal proposals to the board.
• Market volatility associated with significant shareholder activity.

Future Outlook

The reporting persons state they may consider future investment alternatives, including acquiring additional securities, disposing of holdings, or making formal proposals to the board of directors.

Management Comments

• The Reporting Persons reserve the right to acquire additional securities of the issuer in the open markets, in privately negotiated transactions or otherwise, to dispose of all or a portion of their holdings, or to change their intention.

Industry Context

StockSavvy.ai notes that this filing reflects standard regulatory compliance for significant shareholders and insiders, common in mid-cap industrial services companies where family or legacy ownership remains a factor in governance.

Comparison to Industry Standards

• The 18.6% ownership stake is significant for a publicly traded company, placing the reporting persons in a position of substantial influence compared to typical institutional holdings.
• The use of a Grantor Retained Annuity Trust (GRAT) is a standard estate planning tool for high-net-worth individuals holding concentrated equity positions.

Legal Proceedings

• None disclosed.

Related Party Transactions

• The Trust was established by Aspasia F. Vahaviolos, and Stephanie Foglia serves as the trustee.

Stakeholder Impact

• Shareholders should note the concentrated voting power held by the reporting persons.
• Potential for future market activity if the reporting persons decide to adjust their holdings.

Next Steps

• Ongoing evaluation of investment alternatives by the reporting persons.
• Potential future filings if ownership percentages change significantly.

Key Dates

Keywords

Mistras Group, MG, Schedule 13D, Insider Ownership, Beneficial Ownership, Equity Stake