X0202 SCHEDULE 13G 0002082296 XXXXXXXX LIVE Common Stock, $0.01 par value 12/31/2025 0001436126 Mistras Group, Inc. 60649T107 195 Clarksville Road Princeton Junction NJ 08550 Rule 13d-1(c) Aspasia Vahaviolos X1 854292.00 5251358.00 854292.00 5251358.00 6105650.00 N 19.32 IN Mistras Group, Inc. 195 Clarksville Road, Princeton Junction, NJ 08550 Aspasia Vahaviolos 7 Ridgeview Road Princeton, NJ 08540 United States of America Y 6,105,650* * The 6,105,650 shares reported as beneficially owned by the Reporting Person consists of (i) 854,292 shares held directly by the Reporting Person and (ii) 5,251,358 shares held in a grantor retained annuity trust (the "Trust"). The Reporting Person's daughter, who does not reside with her, is the trustee for the Trust and currently holds power over the voting and disposition of the shares of common stock held by the Trust. The Reporting Person may be deemed to have beneficial ownership of the shares held by the Trust because of a potential right to re-acquire the shares within sixty days. 19.32%* * This percentage calculation is based on 31,595,562 outstanding shares as of March 9, 2026 as reported by the issuer. 854,292 5,251,358 854,292 5,251,358 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Aspasia Vahaviolos /s/Aspasia Vahaviolos 03/31/2026