X0306 4 2020-11-16 0001436126 Mistras Group, Inc. MG 0001473735 Stamatakis Manuel N. C/O MISTRAS GROUP, INC. 195 CLARKSVILLE ROAD PRINCETON JUNCTION NJ 08550 1 Common Stock 2020-11-16 4 S 0 47721 4.55 D 136262 D The reporting person, Mr. Stamatakis, sold these shares in open market transactions for 2020 tax planning purposes. Mr. Stamatakis still holds 136,262 shares after taking into account this sale. Mr. Stamatakis intends to purchase additional shares in open market transactions after 30 days have elapsed from the sale date. 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 $4.21 to $4.75. Upon request by the Commission staff or a security holder of the issuer, the full information regarding the number of shares sold 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 2020-11-17