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mg-202603040001436126false00014361262021-03-162021-03-16

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 4, 2026

Mistras Group, Inc. (Exact name of registrant as specified in its charter)

Delaware 001-34481 22-3341267 (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No.)

195 Clarksville Road Princeton Junction,New Jersey 08550 (Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (609) 716-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐          Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐           Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d 2(b))

☐            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueMGNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

.Item 2.02.  Results of Operations and Financial Condition

On March 4, 2026, Mistras Group, Inc. (the "Company," "we," "us" and "our") issued a press release announcing the financial results for our fourth quarter and year ended December 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this report.

Disclosure of Non-GAAP Financial Measures

In the press release attached, the Company uses the terms “Adjusted EBITDA,” “free cash flow,” "net debt" and "net income before special items," which are not measures of financial performance under U.S. generally accepted accounting principles (“GAAP”). The tables to the press release include reconciliations of these non-GAAP financial measures to the most comparable financial measure under GAAP. Also, in the tables to the press release, the non-GAAP financial measures "Segment and Total Company Income (Loss) before Special Items” (which includes operating income (loss) before special items) are presented and reconciled to financial measures under GAAP within the table "Segment and Total Company Income (Loss) from Operations (GAAP) to Income (Loss) from Operations before Special Items (Non-GAAP)." The non-GAAP financial measure "Diluted EPS excluding Special Items," is presented and reconciled to the financial measure under GAAP within the table "Net Income (Loss) (GAAP) and Diluted EPS (GAAP) to Net Income Excluding Special Items (non-GAAP) and Diluted EPS Excluding Special Items (Non-GAAP)." Information about these non-GAAP financial measures are included in the press release.

Our management uses and provides these non-GAAP financial measures as a measure of operating performance and liquidity to assist in comparing performance from period to period on a consistent basis, as a measure for planning and forecasting overall expectations for the Company and for evaluating actual results against such expectations. Adjusted EBITDA and free cash flow are also performance evaluation metrics used to determine incentive compensation for the Company's executive officers.

We believe that investors and other users of the financial statements benefit from the presentation of these non-GAAP financial measures because they provide additional metrics to compare the Company's operating performance and liquidity on a consistent basis and measure underlying trends and results of the Company's business. Adjusted EBITDA and operating income before special items assist in evaluating our operating performance because they remove the impact of certain items that management believes do not directly reflect our core operations. For instance, Adjusted EBITDA generally excludes interest expense, taxes and depreciation and amortization, each of which can vary substantially from company to company depending upon accounting methods and the book value and age of assets, capital structure, capital inv

mg-202511040001436126false00014361262021-03-162021-03-16

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 4, 2025

Mistras Group, Inc. (Exact name of registrant as specified in its charter)

Delaware 001-34481 22-3341267 (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No.)

195 Clarksville Road Princeton Junction,New Jersey 08550 (Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (609) 716-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐          Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐           Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d 2(b))

☐            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueMGNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 2.02.  Results of Operations and Financial Condition

On November 4, 2025, Mistras Group, Inc. (the "Company," "we," "us" and "our") issued a press release announcing the financial results for our third quarter, which ended on September 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this report.

Disclosure of Non-GAAP Financial Measures

In the press release attached, the Company uses the terms “Adjusted EBITDA,” “free cash flow,” "net debt" and "income from operations before special items," which are not measures of financial performance under U.S. generally accepted accounting principles (“GAAP”). The tables to the press release include reconciliations of these non-GAAP financial measures to the most comparable financial measure under GAAP. Also, in the tables to the press release, the non-GAAP financial measures "Segment and Total Company Income (Loss) from Operations before Special Items” (which includes income (loss) from operations before special items) are presented and reconciled to financial measures under GAAP within the table "Segment and Total Company Income (Loss) from Operations (GAAP) to Income from Operations before Special Items (Non-GAAP)." The non-GAAP financial measure "Diluted EPS Excluding Special Items (non-GAAP)," is presented and reconciled to the financial measure under GAAP within the table "Net Income (Loss) (GAAP) and Diluted EPS (GAAP) to Net Income (Loss) Excluding Special Items (non-GAAP) and Diluted EPS Excluding Special Items (Non-GAAP)." Information about these non-GAAP financial measures is included in the press release.

Our management uses and provides these non-GAAP financial measures as a measure of the Company's operating performance and liquidity to assist in comparing performance from period to period on a consistent basis, as a measure for planning and forecasting overall expectations for the Company and for evaluating actual results against such expectations. Adjusted EBITDA and free cash flow are also performance evaluation metrics used to determine incentive compensation for the Company's executive officers.

We believe that investors and other users of the financial statements benefit from the presentation of these non-GAAP financial measures because they provide additional metrics to compare the Company's operating performance and liquidity on a consistent basis and measure underlying trends and results of the Company's business. Adjusted EBITDA and income from operations before special items assist in evaluating our operating performance because they remove the impact of certain items that management believes do not directly reflect our core operations. For instance, Adjusted EBITDA generally excludes interest expense, provision for income taxes, depreciation and amortization, certain acquisition related costs, foreign exchange gain or loss, non-cash