X0407 4 2023-03-17 0001436126 Mistras Group, Inc. MG 0001473738 Lange Michael J. C/O MISTRAS GROUP, INC. 195 CLARKSVILLE ROAD PRINCETON JUNCTION NJ 08550 1 Senior EVP 0 Common Stock 2023-03-17 4 F 0 3249 5.58 D 349983 D Common Stock 2023-03-17 4 F 0 1284 5.62 D 348699 D Performance Share Unit 0 2023-03-17 4 J 0 10260 0 D Common Stock 10260 0 D Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units. Transaction represents the expiration and forfeiture of performance units which were not earned because of the failure to meet the performance conditions. These performance share units vest to the extent earned in 2023 based upon performance metrics for 2022. The reporting person may earn between 0 and 200% of the units reported based on performance. Once earned, these performance share units will be paid in restricted stock units which will vest over 4 years. Michael C. Keefe, attorney-in-fact for Michael J. Lange 2023-03-20