X0508 4 2025-12-31 0001436126 Mistras Group, Inc. MG 0002082296 Vahaviolos Aspasia Felice 7 RIDGEVIEW ROAD PRINCETON NJ 08540 0 0 1 0 0 Common Stock 2025-12-31 4 G 0 5251358 0 D 854292 D Transaction represents a gift by the reporting person to the 2025 2-Year Irrevocable Grantor Retained Annuity Trust of Aspasia F. Vahaviolos (GRAT). Mrs. Vahaviolos has retained an interest in the value of the original principal contribution to the GRAT and will receive annuity payments which may be in shares if the GRAT retains the shares. Any shares retained by the GRAT after annuity payments will be distributed to the beneficiaries of the GRAT upon its termination in two years. Mrs. Vahaviolos' daughter. who does not reside with her is the trustee for the GRAT and will hold sole power over the voting and disposition of the shares held by the GRAT. Mrs. Vahaviolos and the GRAT trustee have agreed that the GRAT will be subject to the issuer's insider trading compliance policy regarding the shares held by the GRAT because of the managerial position with the issuer held by the trustee of the GRAT. /s/ Aspasia Vahaviolos 2026-02-16