Mistras Group, Inc.

Rule 10b5-1 Trading Plans

During the three months ended June 30, 2026, none of the Company's directors or officers, as defined in Section 16 of the Securities Exchange Act of 1934, adopted orterminated a "Rule 10b5-1 trading arrangement" or a "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K of the Securities Exchange Act of 1934.

On August 5, 2026, the Company entered into an amendment to its Credit Agreement, dated August 1, 2022, with the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent. The amendment extended the maturity date of the Company's $190.0 million revolving credit facility and approximately $90.6 million outstanding term loan from July 30, 2027 to July 28, 2028. In connection with the amendment, the Company incurred an extension fee equal to 0.15% of the aggregate committed amount of the revolving credit facility and term loan held by participating lenders. There were no other changes to the material terms of the Credit Agreement, including the applicable interest rate provisions and financial covenants, which remained substantially unchanged. Additional information regarding the amendment is included in Note 15 –Subsequent Events to the unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

The foregoing description of the amendment does not purport to be complete and is qualified in its entirety by reference to the amendment, which is filed as Exhibit 10.1 to this Quarterly Report on Form 10-Q and is incorporated herein by reference.