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 class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value	MG	New 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 impairment charges and reorganization and other costs, 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 investment cycles and the method by which assets were acquired. It also eliminates stock-based compensation, which is a non-cash expense and is excluded by management when evaluating the underlying performance of our business operations.

Our management uses free cash flow when evaluating the performance of our business operations. This financial measure also takes into account cash used to purchase fixed assets needed for business operations which are not expensed. We believe this financial measure provides an additional tool to compare cash generated by our operations on a consistent basis and measure underlying trends and results in our business.

While Adjusted EBITDA and free cash flow are terms and financial measures commonly used by investors and securities analysts, they have limitations. As non-GAAP financial measures, Adjusted EBITDA and free cash flows have no standard meaning and, therefore, may not be comparable with similar financial measures for other companies. Similarly, segment and total company income from operations before special items and diluted EPS excluding special items has no standard meaning and may not be comparable to financial measures for other companies. Adjusted EBITDA and free cash flow are generally limited as analytical tools because they exclude charges and expenses we do incur as part of our operations as well as cash uses which are included in a GAAP cash flow statement. In addition, free cash flow does not represent residual cash flow available for discretionary expenditures since items such as debt repayments are not deducted in determining such measure.

None of these non-GAAP financial measures should be considered in isolation or as a substitute for analyzing our results as reported under U.S. GAAP.

Item 9.01. Financial Statement and Exhibits

Exhibit No. Description

99.1 Press release issued by Mistras Group, Inc. on November 4 , 2025

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


	MISTRAS GROUP, INC.


Date: November 4, 2025	By:	/s/ Edward J. Prajzner
		Name:	Edward J. Prajzner
		Title:	Senior Executive Vice President and Chief Financial Officer


Exhibit No.						Description
99.1						Press release issued by Mistras Group, Inc. on November 4 , 2025

Mistras Group, Inc. 8-K