X0508 4 2025-06-05 0001436126 Mistras Group, Inc. MG 0001473735 Stamatakis Manuel N. C/O MISTRAS GROUP, INC. 195 CLARKSVILLE ROAD PRINCETON JUNCTION NJ 08550 1 1 Executive Chairman 0 Common Stock 2025-06-05 4 P 0 10000 7.71 A 384299 D The price on this line represents the weighted average price for the transactions reported on this line. The range of prices for the transactions reported on this line was $7.69 to $7.74. Upon request by the Commission staff or a security holder of the issuer, the full information regarding the number of shares purchased at each separate price shall be provided. The information has been provided to the issuer. Michael C. Keefe, attorney-in-fact for Manuel N. Stamatakis 2025-06-06