SCHEDULE 13G Filing for Mistras Group, Inc.

Aspasia Vahaviolos, a United States citizen, has filed a SCHEDULE 13G, indicating beneficial ownership of 19.32% of Mistras Group, Inc. common stock as of March 31, 2026. This ownership amounts to 6,105,650 shares, with 854,292 shares held directly and 5,251,358 shares held in a grantor retained annuity trust. Vahaviolos may be deemed to have beneficial ownership of the shares in the trust due to a potential right to re-acquire them within sixty days. The filing asserts that these securities were not acquired or held to influence the control of the issuer. The principal executive office of Mistras Group, Inc. is located at 195 Clarksville Road, Princeton Junction, NJ 08550.