10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended February 29, 2016

Or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period to

Commission file number 001- 34481

Mistras Group, Inc.

(Exact name of registrant as specified in its charter)

Delaware	22-3341267
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
195 Clarksville Road Princeton Junction, New Jersey	08550
(Address of principal executive offices)	(Zip Code)

(609) 716-4000

(Registrant’s telephone number, including area code) 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

ý Yes  o No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

ý Yes  o No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer o	Accelerated filer x
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

o Yes  ý No

As of April 1, 2016, the registrant had 28,924,214 shares of common stock outstanding.

TABLE OF CONTENTS

			PAGE
PART I—FINANCIAL INFORMATION
	ITEM 1.	Financial Statements	1
		Condensed Consolidated Balance Sheets as of February 29, 2016 (unaudited) and May 31, 2015	1
		Unaudited Condensed Consolidated Statements of Income for the three and nine months ended February 29, 2016 and February 28, 2015	2
		Unaudited Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended February 29, 2016 and February 28, 2015	3
		Unaudited Condensed Consolidated Statements of Cash Flows for the nine months ended February 29, 2016 and February 28, 2015	4
		Notes to Unaudited Condensed Consolidated Financial Statements	5
	ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	19
	ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	26
	ITEM 4.A	Controls and Procedures	26
PART II—OTHER INFORMATION
	ITEM 1.	Legal Proceedings	28
	ITEM 1.A.	Risk Factors	28
	ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	28
	ITEM 3.	Defaults Upon Senior Securities	28
	ITEM 4.	Mine Safety Disclosures	28
	ITEM 5.	Other Information	28
	ITEM 6.	Exhibits	29
SIGNATURES			30

i

PART I—FINANCIAL INFORMATION

ITEM 1.Financial Statements

Mistras Group, Inc. and Subsidiaries
Condensed Consolidated Balance Sheets

(in thousands, except share and per share data)

	(unaudited)
	February 29, 2016			May 31, 2015
ASSETS
Current Assets
Cash and cash equivalents	$	18,095		$	10,555
Accounts receivable, net	128,605			133,228
Inventories	9,880			10,841
Deferred income taxes	4,738			5,144
Prepaid expenses and other current assets	13,263			11,698
Total current assets	174,581			171,466
Property, plant and equipment, net	75,665			79,256
Intangible assets, net	44,331			51,276
Goodwill	166,719			166,414
Deferred income taxes	804			1,208
Other assets	1,857			2,107
Total assets	$	463,957		$	471,727
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	10,240		$	10,529
Accrued expenses and other current liabilities	53,184			55,914
Current portion of long-term debt	12,488			17,902
Current portion of capital lease obligations	6,864			8,646
Income taxes payable	2,126			532
Total current liabilities	84,902			93,523
Long-term debt, net of current portion	74,878			95,557
Obligations under capital leases, net of current portion	10,653			10,717
Deferred income taxes	19,150			16,984
Other long-term liabilities	7,482			9,934
Total liabilities	197,065			226,715
Commitments and contingencies
Equity
Preferred stock, 10,000,000 shares authorized	—			—
Common stock, $0.01 par value, 200,000,000 shares authorized	290			287
Additional paid-in capital	212,013			208,064
Retained earnings	79,464			57,581
Accumulated other comprehensive loss	(24,991		)	(21,113		)
Total Mistras Group, Inc. stockholders’ equity	266,776			244,819
Noncontrolling interests	116			193
Total equity	266,892			245,012
Total liabilities and equity	$	463,957		$	471,727

The accompanying notes are an integral part of these condensed consolidated financial statements.

1

Mistras Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Statements of Income

(in thousands, except per share data)

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Revenue	$	160,355		$	163,100		$	534,994		$	536,566
Cost of revenue	112,357			119,356			368,477			382,018
Depreciation	5,189			5,010			15,509			14,781
Gross profit	42,809			38,734			151,008			139,767
Selling, general and administrative expenses	33,747			32,758			103,591			105,158
Research and engineering	677			644			1,899			1,922
Depreciation and amortization	2,742			3,104			8,345			9,998
Acquisition-related (benefit), net	(115		)	(1,642		)	(1,086		)	(3,037		)
Income from operations	5,758			3,870			38,259			25,726
Interest expense	1,123			1,161			4,380			3,418
Income before provision for income taxes	4,635			2,709			33,879			22,308
Provision for income taxes	1,034			941			12,001			8,457
Net income	3,601			1,768			21,878			13,851
Less: net (income) loss attributable to noncontrolling interests, net of taxes	(8		)	49			12			59
Net income attributable to Mistras Group, Inc.	$	3,593		$	1,817		$	21,890		$	13,910
Earnings per common share
Basic	$	0.12		$	0.06		$	0.76		$	0.49
Diluted	$	0.12		$	0.06		$	0.74		$	0.47
Weighted average common shares outstanding:
Basic	28,906			28,656			28,832			28,583
Diluted	29,899			29,529			29,760			29,559

The accompanying notes are an integral part of these condensed consolidated financial statements.

2

Mistras Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Statements of Comprehensive Income

(in thousands)

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Net income	$	3,601		$	1,768		$	21,878		$	13,851
Other comprehensive (loss):
Foreign currency translation adjustments	(2,842		)	(10,694		)	(3,878		)	(18,610		)
Comprehensive income (loss)	759			(8,926		)	18,000			(4,759		)
Less: comprehensive loss (income) attributable to noncontrolling interest	(8		)	49			12			59
Comprehensive income (loss) attributable to Mistras Group, Inc.	$	751		$	(8,877	)	$	18,012		$	(4,700	)

The accompanying notes are an integral part of these condensed consolidated financial statements.

3

Mistras Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Statements of Cash Flows

(in thousands)

	Nine months ended
	February 29, 2016			February 28, 2015
				Note 1
Cash flows from operating activities
Net income	$	21,878		$	13,851
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	23,854			24,779
Deferred income taxes	2,880			2,177
Share-based compensation expense	4,997			4,856
Fair value adjustment to contingent consideration liabilities	(1,292		)	(3,266		)
Other	85			520
Changes in operating assets and liabilities, net of effect of acquisitions of businesses:
Accounts receivable	1,378			12,207
Inventories	1,235			(735		)
Prepaid expenses and other current assets	(2,128		)	(4,522		)
Other assets	102			(571		)
Accounts payable	(66		)	(8,037		)
Accrued expenses and other liabilities	1,197			(4,594		)
Income taxes payable	1,682			(2,149		)
Net cash provided by operating activities	55,802			34,516
Cash flows from investing activities
Purchase of property, plant and equipment	(11,421		)	(11,757		)
Purchase of intangible assets	(894		)	(581		)
Acquisition of businesses, net of cash acquired	(1,709		)	(34,671		)
Proceeds from sale of equipment	1,056			872
Net cash used in investing activities	(12,968		)	(46,137		)
Cash flows from financing activities
Repayment of capital lease obligations	(5,577		)	(6,005		)
Proceeds from borrowings of long-term debt	2,293			1,145
Repayment of long-term debt	(16,991		)	(11,741		)
Proceeds of revolver	45,100			99,200
Repayments of revolver	(56,100		)	(62,100		)
Payment of contingent consideration for business acquisitions	(2,090		)	(3,034		)
Taxes paid related to net share settlement of share-based awards	(1,068		)	(1,462		)
Excess tax benefit from share-based compensation	(266		)	382
Proceeds from the exercise of stock options	361			682
Net cash (used in) provided by financing activities	(34,338		)	17,067
Effect of exchange rate changes on cash and cash equivalents	(956		)	(2,081		)
Net change in cash and cash equivalents	7,540			3,365
Cash and cash equivalents
Beginning of period	10,555			10,020
End of period	$	18,095		$	13,385
Supplemental disclosure of cash paid
Interest	$	4,148		$	2,456
Income taxes	$	7,875		$	12,388
Noncash investing and financing
Equipment acquired through capital lease obligations	$	3,957		$	5,502
Issuance of notes payable	$	—		$	20,488

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

Mistras Group, Inc. and Subsidiaries
Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

1.Description of Business and Basis of Presentation

Description of Business

Mistras Group, Inc. and subsidiaries ("the Company") is a leading “one source” global provider of technology-enabled asset protection solutions used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure. The Company combines industry-leading products and technologies, expertise in mechanical integrity (MI) and non-destructive testing (NDT) services and proprietary data analysis software to deliver a comprehensive portfolio of customized solutions, ranging from routine inspections to complex, plant-wide asset integrity assessments and management. These mission critical solutions enhance customers’ ability to extend the useful life of their assets, increase productivity, minimize repair costs, comply with governmental safety and environmental regulations, manage risk and avoid catastrophic disasters. The Company serves a global customer base of companies with asset-intensive infrastructure, including companies in the oil and gas, fossil and nuclear power, alternative and renewable energy, public infrastructure, chemicals, commercial aerospace and defense, transportation, primary metals and metalworking, pharmaceutical/biotechnology and food processing industries and research and engineering institutions.

Basis of Presentation

The condensed consolidated financial statements contained in this report are unaudited. In the opinion of management, the condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the fiscal years ending May 31, 2016 and 2015. Reference to a fiscal year means the fiscal year ended May 31. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the notes to the audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K (“2015 Annual Report”) for fiscal 2015, as filed with the Securities and Exchange Commission on August 12, 2015.

Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements include the accounts of Mistras Group, Inc. and its wholly and majority-owned subsidiaries. For subsidiaries in which the Company’s ownership interest is less than 100%, the noncontrolling interests are reported in stockholders’ equity in the accompanying condensed consolidated balance sheets. The noncontrolling interests in net income, net of tax, is classified separately in the accompanying condensed consolidated statements of income.

All significant intercompany accounts and transactions have been eliminated in consolidation. Mistras Group, Inc.’s and its subsidiaries’ fiscal years end on May 31 except for the subsidiaries in the International segment, which end on April 30. Accordingly, the Company’s International segment subsidiaries are consolidated on a one month lag. Therefore, in the quarter and year of acquisition, results of acquired subsidiaries in the International segment are generally included in consolidated results for one less month than the actual number of months from the acquisition date to the end of the reporting period. Management does not believe that any events occurred during the one-month lag period that would have a material effect on the Company’s condensed consolidated financial statements.

Reclassification

Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.

Immaterial Correction

Subsequent to the issuance of its interim condensed consolidated financial statements as of and for the three and nine months ended February 28, 2015, the Company identified errors related to the classification of amounts reported in the Condensed Consolidated Statement of Cash Flows for that period. In accordance with the SEC Staff Accounting Bulletin (SAB) No. 99, Materiality, and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements, management evaluated the materiality of the errors from qualitative and quantitative perspectives,

5

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

and concluded that the errors were immaterial. Accordingly, management has corrected the presentation of the affected line items of the accompanying Condensed Consolidated Statement of Cash Flows for the nine months ended February 28, 2015, as summarized below. These changes did not impact the Company’s net income, balance sheet, or stockholders’ equity for any periods previously reported.

	Previously Reported		Revised
Cash flows from operating activities
Accounts payable	(7,741	)	(8,037	)
Accrued expenses and other liabilities	(5,089	)	(4,594	)
Net cash provided by operating activities	34,317		34,516
Cash flows from investing activities
Acquisition of businesses, net of cash acquired	(34,967	)	(34,671	)
Net cash used in investing activities	(46,433	)	(46,137	)
Cash flows from financing activities
Proceeds from borrowings of long-term debt	—		1,145
Repayments of long-term debt	(10,596	)	(11,741	)
Net borrowings against revolver	35,544		37,100
Net cash provided by financing activities	15,511		17,067
Effect of exchange rate changes on cash and cash equivalents	(30	)	(2,081	)

Significant Accounting Policies

The Company’s significant accounting policies are disclosed in Note 2 — Summary of Significant Accounting Policies in the Company's 2015 Annual Report. On an ongoing basis, the Company evaluates its estimates and assumptions, including, among other things those related to revenue recognition, valuations of accounts receivable, long-lived assets, goodwill, deferred tax assets and uncertain tax positions. Since the date of the 2015 Annual Report, there have been no material changes to the Company's significant accounting policies.

Income Taxes

The Company provides for income taxes in interim periods in an amount that aligns its year-to-date tax provision with the effective income tax rate expected for the full year, plus adjustments to certain discrete tax items. During the three months ended February 29, 2016 and February 28, 2015, the Company's effective income tax rate differed from the statutory rate principally due to adjustments to certain discrete tax items related to the resolution and adjustment of certain income tax contingencies, which decreased the effective tax rate by 11% and 8%, respectively.

6

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years and interim periods within those fiscal years beginning December 15, 2017, as a result of a one year deferral in the standard issued by the FASB in August 2015 with ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures.

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. This amendment will simplify the accounting for adjustments made to provisional amounts recognized in a business combination and eliminates the requirement to retrospectively account for those adjustments in previous reporting periods. This update will require on the face of the income statement or in the notes to the financial statements the amount recorded in current-period earnings that would have previously been recorded if the adjustment to the provisional amounts had been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2015. This update should be applied prospectively and earlier adoption is permitted for financial statements that have not been issued. The Company is evaluating the effect that ASU 2015-16 will have on its condensed consolidated financial statements and related disclosures.

In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. This amendment will simplify the presentation of deferred tax assets and liabilities on the balance sheet and require all deferred tax assets and liabilities to be treated as non-current. ASU 2015-17 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2016, with early adoption permitted. The Company is evaluating the effect that ASU 2015-17 will have on its condensed consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This amendment supersedes previous accounting guidance (Topic 840) and requires all leases, with exception of leases with a term of 12 months or less, to be recorded on the balance sheet as lease assets and lease liabilities. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018, with early adoption permitted. The standard requires lessees and lessors to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is evaluating the effect that ASU 2016-02 will have on its condensed consolidated financial statements and related disclosures.

2.Share-Based Compensation

The Company has share-based incentive awards outstanding to its eligible employees and Directors under two equity incentive plans: (i) the 2007 Stock Option Plan (the 2007 Plan), and (ii) the 2009 Long-Term Incentive Plan (the 2009 Plan). No further awards may be granted under the 2007 Plan, although awards granted under the 2007 Plan remain outstanding in accordance with their terms. Awards granted under the 2009 Plan may be in the form of stock options, restricted stock units and other forms of share-based incentives, including performance restricted stock units, stock appreciation rights and deferred stock rights.

Stock Options

For the three and nine months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to stock option awards of less than $0.1 million for each period, respectively. As of February 29, 2016, there was less than $0.1 million of unrecognized compensation costs, net of estimated forfeitures, related to stock option awards, which are expected to be recognized over a remaining weighted average period of less than 0.1 years.

No stock options were granted during the nine months ended February 29, 2016 and February 28, 2015.

Restricted Stock Unit Awards

For the three months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to restricted stock unit awards of $1.1 million and $1.2 million, respectively. For the nine months ended

7

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to restricted stock unit awards of $3.3 million and $3.5 million, respectively. As of February 29, 2016, there was $8.3 million of unrecognized compensation costs, net of estimated forfeitures, related to restricted stock unit awards, which are expected to be recognized over a remaining weighted average period of 2.3 years.

During the first nine months of fiscal 2016 and 2015, the Company granted approximately 28,000 and 21,000 shares, respectively, of fully-vested common stock to its five non-employee directors, in connection with its non-employee director compensation plan. These shares had grant date fair values of $0.5 million and $0.4 million, respectively, which was recorded as share-based compensation expense during the nine months ended February 29, 2016 and February 28, 2015, respectively.

During the first nine months of fiscal 2016 and 2015, approximately 220,000 and 231,000 restricted stock units, respectively, vested. The fair value of these units was $3.5 million and $5.2 million, respectively. Upon vesting, restricted stock units are generally net share-settled to cover the required minimum withholding tax and the remaining amount is converted into an equivalent number of shares of common stock.

Performance Restricted Stock Units

In the third quarter of fiscal 2014, the Company granted one-year, two-year and three-year performance restricted stock units to its executive officers and certain other senior officers. In the second quarter of fiscal 2015, the Company granted performance restricted stock units to its executive and certain other senior officers. In the first quarter of fiscal 2016, the Company modified its equity compensation program and granted 154,000 performance restricted stock units to its executive and certain other senior officers. As a condition for receiving any awards under the revised fiscal 2016 plan, the executive and senior officers surrendered and released all rights to receive any shares under the three-year 2014 awards and three-year 2015 awards with a performance or market condition. The Company has accounted for the fiscal 2016 awards as modifications in accordance with ASC 718, Compensation - Stock Compensation. These units have requisite service periods of five years and have no dividend rights. The actual payout of these units will vary based on the Company’s performance over a one-year period based on three metrics related to the Company’s fiscal 2016 performance: (1) Operating Income, (2) Adjusted EBITDAS, which is consistent with Adjusted EBITDA as disclosed in the financial statements, which is net income before interest, taxes, depreciation, amortization, non-cash stock-based compensation expense, acquisition related items, and other non-routine items as determined by the Committee and (3) Revenue. There is also a discretionary portion based on individual performance. During the three months ended November 30, 2015, the Company evaluated the expected performance metrics and increased the estimated performance shares expected to be granted by 80,000 units to a total of 234,000 units. No adjustment was required during the three months ended February 29, 2016.

Compensation costs are initially measured assuming that the target performance conditions will be achieved. However, compensation costs related to the performance conditions are adjusted for subsequent changes in the expected outcomes of the performance conditions. The discretionary portion of these awards are liability-classified and adjusted to fair value each reporting period. Compensation costs for the discretionary portion of the awards are recognized over the same five year requisite service period as the awards based on the Company’s fiscal 2016 performance. For the three months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense/(benefit) related to performance restricted stock units, inclusive of all awards noted above, of approximately $0.4 million and $(0.8) million, respectively. For the nine months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to these units of approximately $1.2 million and $0.9 million, respectively. At February 29, 2016, there was $3.4 million of total unrecognized compensation costs related to the 234,000 non-vested performance restricted stock units, which are expected to be recognized over a remaining weighted average period of 3.8 years.

3.Earnings per Share

Basic earnings per share is computed by dividing net income by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (1) the weighted-average number of shares of common stock outstanding during the period, and (2) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted-average shares outstanding (denominator), diluted shares

8

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

reflects: (i) only the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common shares during the period and (ii) the pro forma vesting of restricted stock units.

The following table sets forth the computations of basic and diluted earnings per share:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Basic earnings per share
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Basic earnings per share	$	0.12	$	0.06	$	0.76	$	0.49
Diluted earnings per share:
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Dilutive effect of stock options outstanding	739		694		657		742
Dilutive effect of restricted stock units outstanding	254		179		271		234
	29,899		29,529		29,760		29,559
Diluted earnings per share	$	0.12	$	0.06	$	0.74	$	0.47

9

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

4.Acquisitions

Acquisitions

In the first nine months of fiscal 2016, the Company completed one acquisition. The Company purchased a company that provides unmanned aerial systems and NDT services, located in the U.S.

In this acquisition, the Company acquired 100% of the common stock of the acquiree in exchange for consideration of $1.8 million in cash and contingent consideration estimated to be $0.9 million to be earned based upon the acquired business achieving specific performance metrics over the initial four years of operations from the acquisition date. The Company accounted for this transaction in accordance with the acquisition method of accounting for business combinations.

The assets and liabilities of the business acquired in fiscal 2016 were included in the Company's condensed consolidated balance sheet based upon their estimated fair values on the date of acquisition as determined in a preliminary purchase price allocation, using available information and making assumptions management believes are reasonable. The Company is still in the process of completing its valuation of the assets, both tangible and intangible, and liabilities acquired. The results of operations for this acquisition is included in the Services segment's results from the date of acquisition. The Company's preliminary purchase price allocations are included in the table below, summarizing the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:

	Fiscal
	2016
Number of Entities	1
Consideration transferred:
Cash paid	$	1,750
Contingent consideration	945
Consideration transferred	2,695
Current assets	145
Property, plant and equipment	485
Goodwill	2,658
Current liabilities	(521		)
Long-term deferred tax liability	(72		)
Net assets acquired	$	2,695

In the first nine months of fiscal 2015, the Company completed four acquisitions. The Company purchased a company, located in Louisiana, a provider of maintenance and inspection services primarily on offshore platforms. This acquisition expanded the service offerings within the Services segment, allowing the Company to provide services to the upstream operations of its customers. The Company also purchased a group of asset protection businesses located in Quebec, Canada and an asset inspection business in Florida to complement service offerings within the Company’s Services segment and continue its market expansion strategy. The Company’s International Segment completed an acquisition of an asset inspection business located in the United Kingdom.

In these acquisitions, the Company acquired 100% of the common stock or certain assets of each acquiree in exchange for aggregate consideration of approximately $35.7 million in cash and $20.5 million in notes payable issued as part of the acquisitions. The Company accounted for these transactions in accordance with the acquisition method of accounting for business combinations. In addition, the acquisitions in Quebec and Florida provided for contingent consideration of up to $3.2 million to be earned based upon the acquired business achieving specific performance metrics over the initial two to three years of operation from the acquisition date.

10

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

The amortization period of intangible assets acquired in fiscal 2015 ranges from 3 to 10 years. The Company recorded $45.2 million of goodwill in connection with these acquisitions, reflecting the strategic fit and revenue and earnings growth potential of these businesses.

Acquisition-Related Expense

During the three and nine month periods ended February 29, 2016, the Company incurred acquisition-related costs of $0.1 million and $0.2 million, respectively, in connection with due diligence, professional fees, and other expenses for its acquisition activities. Additionally, the Company adjusted the fair value of certain previously recorded acquisition-related contingent consideration liabilities. These adjustments resulted in a net decrease of acquisition-related contingent consideration liabilities and a corresponding increase in income from operations of $0.2 million and $1.3 million, for the three and nine month periods ended February 29, 2016, respectively. The Company’s aggregate acquisition-related contingent consideration liabilities were $3.8 million and $6.4 million as of February 29, 2016 and May 31, 2015, respectively.

During the three and nine month periods ended February 28, 2015, the Company incurred acquisition-related costs of $0.2 million in connection with due diligence, professional fees, and other expenses for its acquisition activities. Additionally, the Company adjusted the fair value of certain previously recorded acquisition-related contingent consideration liabilities. For the three and nine month periods ended February 28, 2015, these adjustments resulted in a net decrease of acquisition-related contingent consideration liabilities and a corresponding increase in income from operations of $1.7 million and $3.3 million, respectively.

The fair value adjustments to acquisition-related contingent consideration liabilities and the acquisition-related transaction costs have been classified as acquisition-related expense, net, in the condensed consolidated statements of income for the three and nine month periods ended February 29, 2016 and February 28, 2015.

5.Accounts Receivable, net

Accounts receivable consisted of the following:

	February 29, 2016			May 31, 2015
Trade accounts receivable	$	132,340		$	136,208
Allowance for doubtful accounts	(3,735		)	(2,980		)
Accounts receivable, net	$	128,605		$	133,228

6.Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

	Useful Life (Years)	February 29, 2016			May 31, 2015
Land		$	1,719		$	1,856
Buildings and improvements	30-40	18,534			17,712
Office furniture and equipment	5-8	8,653			8,084
Machinery and equipment	5-7	166,379			162,612
		195,285			190,264
Accumulated depreciation and amortization		(119,620		)	(111,008		)
Property, plant and equipment, net		$	75,665		$	79,256

11

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

Depreciation expense for the three months ended February 29, 2016 and February 28, 2015 was $5.5 million and $5.4 million, respectively. Depreciation expense for the nine months ended February 29, 2016 and February 28, 2015 was $16.7 million and $16.3 million, respectively.

7.     Goodwill

The changes in the carrying amount of goodwill by segment is shown below:

	Services			International			Products		Total
Balance at May 31, 2014	$	73,767		$	43,552		$	13,197	$	130,516
Goodwill acquired during the year	41,986			1,480			—		43,466
Adjustments to preliminary purchase price allocations	3,529			(367		)	—		3,162
Foreign currency translation	(2,003		)	(8,727		)	—		(10,730		)
Balance at May 31, 2015	$	117,279		$	35,938		$	13,197	$	166,414
Goodwill acquired (disposed) during the year	2,658			(374		)	—		2,284
Adjustments to preliminary purchase price allocations	271			—			—		271
Foreign currency translation	(1,034		)	(1,216		)	—		(2,250		)
Balance at February 29, 2016	$	119,174		$	34,348		$	13,197	$	166,719

The Company reviews goodwill for impairment on a reporting unit basis on March 1 of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. As of February 29, 2016, the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable.

The Company's cumulative goodwill impairment as of February 29, 2016, May 31, 2015 and May 31, 2014 was $9.9 million, which is within its International segment.

8.Intangible Assets

The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:

		February 29, 2016							May 31, 2015
	Useful Life (Years)	Gross Amount		Accumulated Amortization			Net Carrying Amount		Gross Amount		Accumulated Amortization			Net Carrying Amount
Customer relationships	5-12	$	79,577	$	(45,469	)	$	34,108	$	81,101	$	(41,009	)	$	40,092
Software/Technology	3-15	17,055		(11,377		)	5,678		15,738		(10,290		)	5,448
Covenants not to compete	2-5	11,618		(9,102		)	2,516		11,678		(8,605		)	3,073
Other	2-5	6,820		(4,791		)	2,029		6,910		(4,247		)	2,663
Total		$	115,070	$	(70,739	)	$	44,331	$	115,427	$	(64,151	)	$	51,276

Amortization expense for the three months ended February 29, 2016 and February 28, 2015 was $2.4 million and $2.7 million, respectively. Amortization expense for the nine months ended February 29, 2016 and February 28, 2015 was $7.2 million and $8.5 million, respectively.

12

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

9.Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	February 29, 2016		May 31, 2015
Accrued salaries, wages and related employee benefits	$	27,274	$	26,053
Contingent consideration, current portion	1,508		3,543
Accrued workers’ compensation and health benefits	5,933		3,630
Deferred revenue	4,302		3,841
Other accrued expenses	14,167		18,847
Total accrued expenses and other liabilities	$	53,184	$	55,914

10.Long-Term Debt

Long-term debt consisted of the following:

	February 29, 2016			May 31, 2015
Senior credit facility	$	71,528		$	83,062
Notes payable	10,368			24,933
Other	5,470			5,464
Total debt	87,366			113,459
Less: Current portion	(12,488		)	(17,902		)
Long-term debt, net of current portion	$	74,878		$	95,557

Senior Credit Facility

On October 31, 2014, the Company entered into a Third Amendment and Modification Agreement, to its revolving line of credit, the Third Amended and Restated Credit Agreement (“Credit Agreement”) with Bank of America, N.A., as agent for the lenders and a lender, and JPMorgan Chase Bank, N.A., Keybank, National Association and TD Bank, N.A., as lenders. The Credit Agreement provides the Company with a $175.0 million revolving line of credit, which, under certain circumstances, the line of credit can be increased to $225.0 million. The Company may borrow up to $30.0 million in non-U.S. Dollar currencies and use up to $10.0 million of the credit limit for the issuance of letters of credit. The Credit Agreement has a maturity date of October 30, 2019. As of February 29, 2016, the Company had borrowings of $71.5 million and a total of $4.5 million of letters of credit outstanding under the Credit Agreement.

Loans under the Credit Agreement bear interest at LIBOR plus an applicable LIBOR margin ranging from 1% to 1.75%, or a base rate less a margin of 1.25% to 0.375%, at the option of the Company, based upon the Company’s Funded Debt Leverage Ratio. Funded Debt Leverage Ratio is generally the ratio of (1) all outstanding indebtedness for borrowed money and other interest-bearing indebtedness as of the date of determination to (2) EBITDA (which is (a) net income, less (b) income (or plus loss) from discontinued operations and extraordinary items, plus (c) income tax expenses, plus (d) interest expense, plus (e) depreciation, depletion, and amortization (including non-cash loss on retirement of assets), plus (f) stock compensation expense, less (g) cash expense related to stock compensation, plus or minus certain other adjustments) for the period of four consecutive fiscal quarters immediately preceding the date of determination. The Company has the benefit of the lowest margin if its Funded Debt Leverage Ratio is equal to or less than 0.5 to 1, and the margin increases as the ratio increases, to the maximum margin if the ratio is greater than 2.0 to 1. The Company will also bear additional costs for market disruption, regulatory changes effecting the lenders’ funding costs, and default pricing of an additional 2% interest rate margin on any amounts not paid when due. Amounts borrowed under the Credit Agreement are secured by liens on substantially all of the assets of the Company.

The Credit Agreement contains financial covenants requiring that the Company maintain a Funded Debt Leverage Ratio of no greater than 3.25 to 1 and an Interest Coverage Ratio of at least 3.0 to 1. Interest Coverage Ratio means the ratio, as of any date

13

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

of determination, of (a) EBITDA for the 12 month period immediately preceding the date of determination, to (b) all interest, premium payments, debt discount, fees, charges and related expenses of the Company and its subsidiaries in connection with borrowed money (including capitalized interest) or in connection with the deferred purchase price of assets, in each case to the extent treated as interest in accordance with GAAP, paid during the 12 month period immediately preceding the date of determination. The Credit Agreement also limits the Company’s ability to, among other things, create liens, make investments, incur more indebtedness, merge or consolidate, make dispositions of property, pay dividends and make distributions to stockholders, enter into a new line of business, enter into transactions with affiliates and enter into burdensome agreements. The Credit Agreement does not limit the Company’s ability to acquire other businesses or companies except that the acquired business or company must be in the Company's line of business, the Company must be in compliance with the financial covenants on a pro forma basis after taking into account the acquisition, and, if the acquired business is a separate subsidiary, in certain circumstances the lenders will receive the benefit of a guaranty of the subsidiary and liens on its assets and a pledge of its stock.

As of February 29, 2016, the Company was in compliance with the terms of the Credit Agreement, and will continuously monitor its compliance with the covenants contained in its credit agreement.

Notes Payable and Other

In connection with certain of its acquisitions through fiscal 2015, the Company issued subordinated notes payable to the sellers. The maturity of the notes that remain outstanding range from two to five years from the date of acquisition with stated interest rates ranging from 0% to 4%. The Company has discounted these obligations to reflect a 2% to 4% market interest. Unamortized discount on the notes was de minimis as of February 29, 2016 and May 31, 2015. Amortization is recorded as interest expense in the condensed consolidated statements of income.

The Company has evaluated current market conditions and borrower credit quality and has determined that the carrying value of its long-term debt approximates fair value. The fair value of the Company’s notes payable and capital lease obligations approximates their carrying amounts based on anticipated interest rates which management believes would currently be available to the Company for similar issuances of debt.

11.Fair Value Measurements

The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It also establishes a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of the hierarchy are defined as follows:

Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 — Observable inputs other than quoted prices included in Level 1, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data.

Level 3 — Unobservable inputs reflecting the Company’s own assumptions about inputs that market participants would use in pricing the asset or liability based on the best information available.

14

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

In accordance with the fair value hierarchy described above, the following table shows the fair value of the Company’s financial liabilities that are required to be remeasured at fair value on a recurring basis:

	February 29, 2016
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	3,808	$	3,808
Total Liabilities	$	—	$	—	$	3,808	$	3,808

	May 31, 2015
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	6,411	$	6,411
Total Liabilities	$	—	$	—	$	6,411	$	6,411

The fair value of contingent consideration liabilities that was classified as Level 3 in the table above was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements.

12.Commitments and Contingencies

Litigation and Government Investigations

The Company is subject to periodic lawsuits, investigations and claims that arise in the ordinary course of business. Although the Company cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against it, the Company does not believe that any currently pending legal proceeding to which the Company is a party will have a material adverse effect on its business, results of operations, cash flows or financial condition, except for the proceedings described below for which the Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability estimate. The costs of defense and amounts that may be recovered against the Company in such matters may be covered by insurance, except that the primary claims set forth in the purported class action case in California is excluded from insurance coverage.

Litigation and Commercial Claims

In April 2015, two separate lawsuits were filed in California as purported class action lawsuits on behalf of current and former Mistras employees. The cases are David Kruger v Mistras Group, Inc., filed in the U.S. District Court for the Eastern District of California and Edgar Viceral v Mistras Group, et al, pending in the U.S. District Court for the Northern District of California. Both cases were originally filed in California state court and were removed to the respective U.S. District Courts for the districts in which the state court cases were filed. These two cases have been consolidated, with Kruger dismissing his case and joining the Viceral case. As part of this consolidation, the claims in the Kruger case that were not part of the Viceral case were added to the Viceral case by the filing of an amended complaint. The consolidated case alleges violations of California statutes primarily, the California Labor Code, and seeks to proceed as a collective action under the U.S. Fair Labor Standards Act. The case is predicated on claims for allegedly missed rest and meal periods, inaccurate wage statements, and failure to pay all wages due, as well as related unfair business practices, and is requesting payment of all damages, including unpaid wages, and various fines and penalties available under California law. The parties met with a mediator on April 5, 2016 but no resolution of the case was reached, though the Company anticipates discussions regarding resolution may continue. The Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability, if any, related to these matters, and accordingly, has not established any reserves for these matters.

15

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

During fiscal 2012 and 2013, the Company performed radiography work on the construction of pipeline projects in the U.S. The Company has received notice that the owner of the pipeline projects contends that certain of the x-ray images the Company’s technicians prepared regarding the projects did not meet the code quality interpretation standards required by API (American Petroleum Institute) 1103. The projects' owner is claiming damages as a result of the alleged quality defects of the Company’s x-ray images. No lawsuit has been filed at this time. The Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability related to this matter, and accordingly, has not established any reserves for this matter.

Government Investigations

In May 2015, the Company received a notice from the U.S. Environmental Protection Agency (“EPA”) that it performed a preliminary assessment at a leased facility the Company operates in Cudahy, California. Based upon the preliminary assessment, the EPA is conducting an investigation of the site, which includes taking groundwater and soil samples. The purpose of the investigation is to determine whether any hazardous materials were released from the facility. The Company has been informed that certain hazardous materials and pollutants have been found in the ground water in the general vicinity of the site and the EPA is attempting to ascertain the origination or source of these materials and pollutants. Given the historic industrial use of the site, the EPA determined that the site of the Cudahy facility should be examined, along with numerous other sites in the vicinity. At this time, the Company is unable to determine whether it has any liability in connection with this matter and if so, the amount or range of any such liability, and accordingly, has not established any reserves for this matter.

In January 2012, the Company received notice of a governmental investigation concerning an environmental incident which occurred in February 2011 outside on the premises of the Cudahy facility.  No human injury or property damage was reported or appears to have been caused as a result of this incident. While management cannot predict the ultimate outcome of this matter, based on its internal investigation to date, the Company does not believe the outcome will have a material effect on its financial condition or results of operations. To the Company’s knowledge, this matter has been dormant since fiscal 2012.

Acquisition-related contingencies

The Company is liable for contingent consideration in connection with certain of its acquisitions. As of February 29, 2016, total potential acquisition-related contingent consideration ranged from zero to approximately $17.8 million and would be payable upon the achievement of specific performance metrics by certain of the acquired companies over the next 3.3 years of operations. See Note 4 - Acquisitions to these condensed consolidated financial statements for further discussion of the Company’s acquisitions.

13.Segment Disclosure

The Company’s three operating segments are:

• Services. This segment provides asset protection solutions primarily in North America with the largest concentration in the United States and the Canadian services business, consisting primarily of non-destructive testing and inspection and engineering services that are used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure.

• International. This segment offers services, products and systems similar to those of the Company’s other two segments to global markets, principally in Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by the Products and Systems segment.

• Products and Systems. This segment designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States.

Allocations for general corporate services, including accounting, audit, and contract management, that are provided to the segments are reported within Corporate and eliminations. Sales to the International segment from the Products and Systems segment and subsequent sales by the International segment of the same items are recorded and reflected in the operating performance of both segments. Additionally, engineering charges and royalty fees charged to the Services and International segments by the Products and Systems segment are reflected in the operating performance of each segment. All such intersegment transactions are eliminated in the Company’s consolidated financial reporting.

16

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

Selected consolidated financial information by segment for the periods shown was as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Revenues
Services	$	123,616		$	121,845		$	411,484		$	404,651
International	31,801			33,554			107,085			114,610
Products and Systems	6,866			8,526			23,343			22,588
Corporate and eliminations	(1,928		)	(825		)	(6,918		)	(5,283		)
	$	160,355		$	163,100		$	534,994		$	536,566

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016			February 28, 2015
Gross profit
Services	$	30,256	$	27,429	$	107,943		$	101,452
International	9,227		7,018		32,113			27,795
Products and Systems	3,202		4,211		10,957			10,203
Corporate and eliminations	124		76		(5		)	317
	$	42,809	$	38,734	$	151,008		$	139,767

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Income (loss) from operations
Services	$	10,071		$	7,257		$	44,285		$	36,208
International	1,136			(1,315		)	6,925			1,163
Products and Systems	438			1,346			2,677			1,330
Corporate and eliminations	(5,887		)	(3,418		)	(15,628		)	(12,975		)
	$	5,758		$	3,870		$	38,259		$	25,726

Income (loss) by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations.

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Depreciation and amortization
Services	$	5,556		$	5,658		$	16,640		$	16,622
International	1,876			1,919			5,762			6,130
Products and Systems	587			608			1,727			1,809
Corporate and eliminations	(88		)	(71		)	(275		)	218
	$	7,931		$	8,114		$	23,854		$	24,779

17

Mistras Group, Inc. and Subsidiaries

Notes to Unaudited Condensed Consolidated Financial Statements

(tabular dollars in thousands, except per share data)

	February 29, 2016		May 31, 2015
Goodwill
Services	$	119,174	$	117,279
International	34,348		35,938
Products and Systems	13,197		13,197
	$	166,719	$	166,414

	February 29, 2016		May 31, 2015
Total assets
Services	$	300,553	$	301,031
International	122,669		126,643
Products and Systems	32,753		35,464
Corporate and eliminations	7,982		8,589
	$	463,957	$	471,727

Revenues by geographic area for the three and nine months ended February 29, 2016 and 2015, respectively, were as follows:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Revenues
United States	$	109,518	$	113,664	$	371,929	$	365,912
Other Americas	17,162		14,353		52,248		53,917
Europe	29,706		31,644		100,411		106,370
Asia-Pacific	3,969		3,439		10,406		10,367
	$	160,355	$	163,100	$	534,994	$	536,566

18

ITEM 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following Management’s Discussion and Analysis (“MD&A”) includes a narrative explanation and analysis of our results of operations and financial condition for the three and nine months ended February 29, 2016 and February 28, 2015. The MD&A should be read together with our condensed consolidated financial statements and related notes included in Item 1 in this Quarterly Report on Form 10-Q and our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for fiscal 2015 filed August 12, 2015 (“2015 Annual Report”). In this quarterly report, our fiscal years, which end on May 31, are identified according to the calendar year in which they end (e.g., the fiscal year ending May 31, 2016 is referred to as “fiscal 2016”), and unless otherwise specified or the context otherwise requires, “Mistras,” “the Company,” “we,” “us” and “our” refer to Mistras Group, Inc. and its consolidated subsidiaries. The MD&A includes disclosure in the following areas:

•Forward-Looking Statements

•Overview

•Results of Operations

•Liquidity and Capital Resources

•Critical Accounting Policies and Estimates

Forward-Looking Statements

This report on Form 10-Q contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, and Section 21E of the Securities Exchange Act of 1934 (“Exchange Act”). Such forward-looking statements include those that express plans, anticipation, intent, contingency, goals, targets or future development and/or otherwise are not statements of historical fact. These forward-looking statements are based on our current expectations and projections about future events and they are subject to risks and uncertainties known and unknown that could cause actual results and developments to differ materially from those expressed or implied in such statements.

In some cases, you can identify forward-looking statements by terminology, such as “goals,” or “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “may,” “could,” “should,” “would,” “predicts,” “appears,” “projects,” or the negative of such terms or other similar expressions. You are urged not to place undue reliance on any such forward-looking statements, any of which may turn out to be wrong due to inaccurate assumptions, various risks, uncertainties or other factors known and unknown. Factors that could cause or contribute to differences in results and outcomes from those in our forward-looking statements include, without limitation, those discussed in the “Business—Forward-Looking Statements,” and “Risk Factors” sections of our 2015 Annual Report as well as those discussed in our other filings with the Securities and Exchange Commission (“SEC”).

Overview

We offer our customers “one source for asset protection solutions”® and are a leading global provider of technology-enabled asset protection solutions used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure. We combine industry-leading products and technologies, expertise in mechanical integrity (MI), Non-Destructive Testing (NDT), Destructive Testing (DT) and predictive maintenance (PdM) services, process and fixed asset engineering and consulting services, proprietary data analysis and our world class enterprise inspection database management and analysis software, PCMS, to deliver a comprehensive portfolio of customized solutions, ranging from routine inspections to complex, plant-wide asset integrity management and assessments. These mission critical solutions enhance our customers’ ability to comply with governmental safety and environmental regulations, extend the useful life of their assets, increase productivity, minimize repair costs, manage risk and avoid catastrophic disasters. Our operations consist of three reportable segments: Services, International and Products and Systems.

• Services provides asset protection solutions predominantly in North America with the largest concentration in the United States along with a growing Canadian business, consisting primarily of NDT, inspection and engineering services that are used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure.

• International offers services, products and systems similar to those of the other segments to global markets, principally in Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by the Products and Systems segment. South America consists of our Brazil operations.

19

• Products and Systems designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States.

Given the role our solutions play in ensuring the safe and efficient operation of infrastructure, we provide a majority of our services to our customers on a regular, recurring basis. We serve a global customer base of companies with asset-intensive infrastructure, including companies in the oil and gas (downstream, midstream, upstream and petrochemical), power generation (natural gas, fossil, nuclear, alternative, renewable, and transmission and distribution), public infrastructure, chemicals, commercial aerospace and defense, transportation, primary metals and metalworking, pharmaceutical/biotechnology and food processing industries and research and engineering institutions. We have established long-term relationships as a critical solutions provider to many of the leading companies in our target markets.

For the last several years, we have focused on introducing our advanced asset protection solutions to our customers using proprietary, technology-enabled software and testing instruments, including those developed by our Products and Systems segment. During this period, the demand for outsourced asset protection solutions, in general, has increased, creating demand from which our entire industry has benefited. We believe continued growth can be realized in all of our target markets. Concurrent with this growth, we are working on building our infrastructure to profitably absorb additional growth and have made a number of acquisitions in an effort to leverage our fixed costs, grow our base of experienced, certified personnel, expand our product and technical capabilities and increase our geographical reach.

We have increased our capabilities and the size of our customer base through the development of applied technologies and managed support services, organic growth and the integration of acquired companies. These acquisitions have provided us with additional products, technologies, resources and customers that we believe will enhance our advantages over our competition.

Global financial markets continue to experience uncertainty, including tight liquidity and credit availability, relatively low consumer confidence, slow economic growth, fluctuating oil prices, which are currently very low, and volatile currency exchange rates. However, we believe these conditions have allowed us to selectively hire new talented individuals that otherwise might not have been available to us, and to make acquisitions of complementary businesses at reasonable valuations.

Results of Operations

Condensed consolidated results of operations for the three and nine months ended February 29, 2016 and February 28, 2015 were as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
	($ in thousands)						($ in thousands)
Revenues	$	160,355		$	163,100		$	534,994		$	536,566
Gross profit	42,809			38,734			151,008			139,767
Gross profit as a % of Revenue	27		%	24		%	28		%	26		%
Total operating expenses	37,051			34,864			112,749			114,041
Operating expenses as a % of Revenue	23		%	21		%	21		%	21		%
Income from operations	5,758			3,870			38,259			25,726
Income from Operations as a % of Revenue	4		%	2		%	7		%	5		%
Interest expense	1,123			1,161			4,380			3,418
Income before provision for income taxes	4,635			2,709			33,879			22,308
Provision for income taxes	1,034			941			12,001			8,457
Net income	3,601			1,768			21,878			13,851
Less: net (income) loss attributable to noncontrolling interests, net of taxes	$	(8	)	49			12			59
Net income attributable to Mistras Group, Inc.	$	3,593		$	1,817		$	21,890		$	13,910

20

EBITDA and Adjusted EBITDA, non-GAAP measures explained below, for the three and nine months ended February 29, 2016 and February 28, 2015 were as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
	($ in thousands)						($ in thousands)
EBITDA and Adjusted EBITDA data
Net income attributable to Mistras Group, Inc.	$	3,593		$	1,817		$	21,890		$	13,910
Interest expense	1,123			1,161			4,380			3,418
Provision for income taxes	1,034			941			12,001			8,457
Depreciation and amortization	7,931			8,114			23,854			24,779
EBITDA	$	13,681		$	12,033		$	62,125		$	50,564
Share-based compensation expense	1,770			599			4,997			4,856
Acquisition-related (benefit), net	(115		)	(1,642		)	(1,086		)	(3,037		)
Severance	54			160			293			401
Foreign exchange (gain) loss	(98		)	247			357			1,213
Adjusted EBITDA	$	15,292		$	11,397		$	66,686		$	53,997

Note About Non-GAAP Measures

Adjusted EBITDA is a performance measure used by management that is not calculated in accordance with U.S. generally accepted accounting principles (GAAP). EBITDA is defined in this Report as net income attributable to Mistras Group, Inc. plus: interest expense, provision for income taxes and depreciation and amortization. Adjusted EBITDA is defined in this Report as net income attributable to Mistras Group, Inc. plus: interest expense, provision for income taxes, depreciation and amortization, share-based compensation expense, and certain acquisition-related costs (including transaction due diligence costs and adjustments to the fair value of contingent consideration), foreign exchange loss and, if applicable, certain non-recurring items which we note.

Management uses Adjusted EBITDA as a measure of operating performance to assist in comparing performance from period to period on a consistent basis, as a measure for planning and forecasting overall expectations and for evaluating actual results against such expectations. Adjusted EBITDA is also used as the basis for a performance evaluation metric for executive and employee incentive compensation programs.

In the MD&A under the heading "Income from Operations", the non-GAAP financial performance measures "Income from operations before acquisition-related expense (benefit), net” is used for each of our three segments and the "Total Company", with tables reconciling the measure to a financial measure under GAAP. This non-GAAP measures excludes from the GAAP measure "Income from Operations" (a) transaction expenses related to acquisitions, such as professional fees and due diligence costs and (b) the net changes in the fair value of acquisition-related contingent consideration liabilities. These items have been excluded from the GAAP measure because these expenses and credits are not related to the Company’s or Segment’s core business operations and are related solely to the Company’s or Segment’s acquisition activities. Changes in the fair value of acquisition-related contingent consideration liabilities can be a net expense or credit in any given period, and fluctuate based upon the then current value of cash consideration the Company expects to pay in the future for prior acquisitions, without impacting cash generated from the Company’s business operations.

In the MD&A section "Liquidity and Capital Resources", we use the term free cash flow, a non-GAAP measurement. We define free cash flow as cash provided by operating activities less capital expenditures (which is classified as an investing activity). Free cash flow for the first nine months of fiscal 2016 was $43.5 million consisting of $55.8 million of operating cash flow less $12.3 million of capital expenditures. For the comparable period in fiscal 2015, free cash flow was $22.2 million consisting of $34.5 million of operating cash flow less $12.3 million of capital expenditures.

Revenue

Revenues for the three months ended February 29, 2016 were $160.4 million, a decrease of $2.7 million, or 1.7%, compared to the prior year. Revenues for the nine months ended February 29, 2016 were $535.0 million, a decrease of $1.6 million, or 0.3%, compared to the nine months ended February 28, 2015.

21

Revenues by segment for the three and nine months ended February 29, 2016 and February 28, 2015 were as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
	($ in thousands)						($ in thousands)
Revenues
Services	$	123,616		$	121,845		$	411,484		$	404,651
International	31,801			33,554			107,085			114,610
Products and Systems	6,866			8,526			23,343			22,588
Corporate and eliminations	(1,928		)	(825		)	(6,918		)	(5,283		)
	$	160,355		$	163,100		$	534,994		$	536,566

Three Months

In the third quarter of fiscal 2016, Services segment revenues increased1% due to a combination of low single digit organic growth coupled with a small amount of acquisition growth, which more than offset the adverse impact of a weaker Canadian dollar. Products and Systems segment revenues decreased by 20% driven by timing of sales. International segment revenues decreased by 5%, driven by an unfavorable impact of foreign exchanges rates and dispositions which caused revenues to decline by low double digits, which more than offset mid single-digit organic growth.

Oil and gas revenues increased by approximately 6% and remained the Company’s most significant vertical market, comprising approximately 59% and 53% of total Company revenues in the third quarters of fiscal 2016 and 2015, respectively. The Company’s top ten customers comprised approximately 40% of total revenues in the third quarter of fiscal 2016 compared with approximately 36% in the third quarter of the prior fiscal year.

Nine Months

In the first nine months of fiscal 2016, our revenue decrease of less than 1% was adversely impacted by a combination of foreign exchange and dispositions which reduced revenues by approximately $24 million, or 4%. Services segment revenues increased2% due to acquisition growth of low single digits, offset by adverse foreign exchange rates, while organic growth was flat. International segment revenues decreased7% compared with the prior year driven by a mid-teens decline from foreign exchange rates and dispositions. Products and Systems segment revenues increased3%, primarily due to greater volume.

The Company experienced mid-single digit year-on-year growth in its oil and gas vertical market. Oil and gas revenues comprised approximately 56% and 52% of total Company revenues in the first nine months of fiscal 2016 and 2015, respectively. The Company’s top ten customers comprised approximately 36% of total revenues in the first nine months of fiscal 2016 compared with approximately 33% in the first nine months of the prior fiscal year.

Gross Profit

Gross profit increased by $4.1 million, or 10.5%, in the third quarter of fiscal 2016, on a sales decline of 1.7%. Gross profit increased by $11.2 million, or 8.0% during the first nine months of fiscal 2016, on a sales decline of less than 1%.

Gross profit by segment for the three and nine months ended February 29, 2016 and February 28, 2015 was as follows:

22

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016			February 28, 2015
	($ in thousands)				($ in thousands)
Gross profit
Services	$	30,256	$	27,429	$	107,943		$	101,452
International	9,227		7,018		32,113			27,795
Products and Systems	3,202		4,211		10,957			10,203
Corporate and eliminations	124		76		(5		)	317
	$	42,809	$	38,734	$	151,008		$	139,767

Three months

As a percentage of revenues, gross profit was 26.7% and 23.7% for the third quarters of fiscal 2016 and 2015, respectively. Service segment gross profit margins increased to 24.5% in the third quarter of fiscal 2016 compared to 22.5% in the third quarter of fiscal 2015. The 200 basis point increase was driven by improved technical labor utilization, sales mix, improvements in contract management and lower overhead costs. International segment gross margins increased to 29.0% in the third quarter of fiscal 2016 compared with 20.9% in the prior year. The 810 basis point increase was due to improvement in each of our four largest country locations, driven by prior year management changes and staffing actions that improved technical labor utilization, as well as improvements in sales mix and overhead costs. Products and Systems segment gross margin declined by 280 basis points to 46.6% compared with 49.4% in the prior year, driven by lower sales volume.

Nine Months

As a percentage of revenues, gross profit was 28.2% and 26.0% for the first nine months of fiscal 2016 and 2015, respectively. The increase in gross profit percentage was primarily attributable to the Services and International segments. Service segment gross profit margin increased to 26.2% compared to 25.1% in the first nine months of fiscal 2015, due to improved technical labor utilization, sales mix, contract management and lower overhead costs. International segment gross margins increased to 30.0% in the first nine months of fiscal 2016 compared with 24.3% in the prior year, due to improvement in each of our four largest country locations, driven by prior year management changes and staffing actions that improved technical labor utilization, as well as improvements in sales mix and overhead costs. Products and Systems segment gross margin improved to 46.9% compared to 45.2% in the prior year driven by a more favorable sales mix.

23

Income from Operations

The following table shows a reconciliation of the income from operations before acquisition-related expense (benefit), net, to income from operations for each of the Company's three segments and for the Company in total:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
	($ in thousands)						($ in thousands)
Services:
Income from operations before acquisition-related expense (benefit), net	$	9,857		$	7,082		$	43,478		$	36,819
Acquisition-related expense (benefit), net	(214		)	(175		)	(807		)	611
Income from operations	10,071			7,257			44,285			36,208
International:
Income from operations before acquisition-related expense (benefit), net	$	1,156		$	(2,438	)	$	6,488		$	(896	)
Acquisition-related expense (benefit), net	20			(1,123		)	(437		)	(2,059		)
Income from operations	1,136			(1,315		)	6,925			1,163
Products and Systems:
Income from operations before acquisition-related expense (benefit), net	$	438		$	1,346		$	2,677		$	1,330
Acquisition-related expense (benefit), net	—			—			—			—
Income from operations	438			1,346			2,677			1,330
Corporate and Eliminations:
Loss from operations before acquisition-related expense (benefit), net	$	(5,808	)	$	(3,762	)	$	(15,470	)	$	(14,564	)
Acquisition-related expense (benefit), net	79			(344		)	158			(1,589		)
Loss from operations	(5,887		)	(3,418		)	(15,628		)	(12,975		)
Total Company
Income from operations before acquisition-related expense (benefit), net	$	5,643		$	2,228		$	37,173		$	22,689
Acquisition-related expense (benefit), net	$	(115	)	$	(1,642	)	$	(1,086	)	$	(3,037	)
Income from operations	$	5,758		$	3,870		$	38,259		$	25,726

Three months

For the three months ended February 29, 2016, income from operations increased $1.9 million, or 49%, compared with the prior year’s third quarter. As a percentage of revenues, income from operations was 4% and 2% for the third quarters of fiscal 2016 and 2015, respectively.

Operating expenses increased $2.2 million, or 6%, compared with the prior year’s third quarter. The Services, International, and Products and Systems segments year-on-year operating expenses were flat. Corporate operating expenses were $2.5 million higher than in the prior year's third quarter, as a normal level of share-based compensation was incurred in the current year period compared with an abnormally low prior year amount, as well as an elevated level of legal costs.

Nine Months

For the nine months ended February 29, 2016, income from operations increased $12.5 million or 49%, compared with the prior year’s first nine months. As a percentage of revenues, income from operations was 7% and 5% for the first nine months of fiscal 2016 and 2015, respectively.

Operating expenses decreased by $1.3 million, or 1% compared with the prior year’s first nine months. The Services segment experienced an year-on-year operating expense decrease of $1.6 million, driven by decreased salary and benefits related costs. The International segment year-on-year operating expenses declined by $1.4 million, driven by the impact of foreign exchange

24

rates and continued cost reduction initiatives. Products and Systems operating expenses declined by $0.6 million, due primarily to the impact of cost reductions. Corporate operating expenses were $2.3 million higher than in the prior year's first nine months, as a normal level of share-based compensation was incurred in the current year period compared with an abnormally low prior year amount, as well as an elevated level of legal costs.

Interest Expense

Interest expense was approximately $1.1 million and $1.2 million for the third quarters of fiscal 2016 and 2015, respectively. Interest expense was approximately $4.4 million and $3.4 million for the first nine months of fiscal 2016 and 2015, respectively. The increase was primarily related to interest expense on seller notes from our recent acquisitions.

Income Taxes

The Company’s effective income tax rate was approximately 22% and 35% for the third quarter of fiscal 2016 and 2015, respectively. Fiscal 2016 and 2015 rates included favorable discrete tax items aggregating $0.5 million in the current year and $0.2 million in the prior year, which decreased the effective tax rate by 11% and 8%, respectively. The decrease in the current year related primarily to reserves that were released due to the lapse of the related statute of limitations. The Company's effective income tax rate was approximately 35% and 38% for the first nine months of fiscal 2016 and 2015, respectively. These same items reduced the year to date effective tax rates by 2% in the current year and 1% in the prior year.

Liquidity and Capital Resources

Cash Flows Table

Cash flows are summarized in the table below:

	Nine months ended
	February 29, 2016			February 28, 2015
	($ in thousands)
Net cash provided by (used in):
Operating activities	$	55,802		$	34,516
Investing activities	(12,968		)	(46,137		)
Financing activities	(34,338		)	17,067
Effect of exchange rate changes on cash	(956		)	(2,081		)
Net change in cash and cash equivalents	$	7,540		$	3,365

Cash Flows from Operating Activities

During the nine months ended February 29, 2016, cash provided by operating activities was $55.8 million, an increase of $21.3 million, or 62%. The improvement was primarily attributable to the Company’s $12.7 million improvement in Adjusted EBITDA, as well as a 3 day reduction in DSO that reduced working capital outlays.

Cash Flows from Investing Activities

During the nine months ended February 29, 2016, cash used in investing activities was $13.0 million, compared with cash outflow of $46.1 million in the comparable period of the prior year. The prior year's first nine months included $34.7 million outflow related to acquisitions, compared with $1.7 million cash utilized for this purpose in the first nine months of fiscal 2016. Cash used for capital expenditures was $12.3 million in the first nine months of fiscal 2016 and 2015.

Cash Flows from Financing Activities

Net cash used by financing activities was $34.3 million for the nine months ended February 29, 2016. The Company utilized most of the $43.5 million of free cash flow generated in the first nine months of fiscal 2016 to reduce its debt and capital lease obligations by $31.3 million, and to fund other tax-related outflows totaling $1.0 million. The Company generated cash from financing activities in the prior year’s comparable period by taking on a net of $37.1 million of additional debt to fund

25

acquisitions made in the prior year, offset by repayments of debt, capital lease obligations and contingent consideration obligations of approximately $20 million.

Effect of Exchange Rate Changes on Cash and Cash Equivalents

The effect of exchange rate changes on our cash and cash equivalents was a net reduction of $1.0 million in the nine months of fiscal 2016, compared to $2.1 million for the nine months of fiscal 2015, driven by a stronger U.S. dollar and dispositions of three small foreign subsidiaries made at the end of the prior fiscal year.

Cash Balance and Credit Facility Borrowings

The terms of our Credit Agreement have not changed from those set forth in Part II, Item 7 of our 2015 Annual Report under the Section “Liquidity and Capital Resources”, under the heading “Cash Balance and Credit Facility Borrowings,” and Note 9 - Long-Term Debt to these condensed consolidated financial statements in this report, under the heading “Senior Credit Facility.”

As of February 29, 2016, we had cash and cash equivalents totaling $18.1 million and available borrowing capacity of $99.0 million under our Credit Agreement with borrowings of $71.5 million and $4.5 million of letters of credit outstanding. We finance operations primarily through our existing cash balances, cash collected from operations, bank borrowings and capital lease financing. We believe these sources are sufficient to fund our operations for the foreseeable future.

As of February 29, 2016, we were in compliance with the terms of the Credit Agreement, and we will continuously monitor our compliance with the covenants contained in our Credit Agreement.

Contractual Obligations

Other than the amendment to the Credit Agreement, discussed above under “Liquidity and Capital Resources- Cash Balance and Credit Facility Borrowings”, there have been no significant changes in our contractual obligations and outstanding indebtedness as disclosed in the 2015 Annual Report.

Off-balance Sheet Arrangements

During the nine months ended February 29, 2016, we did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

Critical Accounting Policies and Estimates

There have been no significant changes to our critical accounting policies and estimates from the information provided in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” included in the 2015 Annual Report.

ITEM 3.Quantitative and Qualitative Disclosures about Market Risk

There have been no significant changes to the Company’s quantitative and qualitative disclosures about market risk as discussed in Part II, Item 7A “Quantitative and Qualitative Disclosures About Market Risk,” included in the 2015 Annual Report.

ITEM 4.Controls and Procedures

Evaluation of Disclosure Controls and Procedures

As of February 29, 2016, the Company carried out an evaluation, under the supervision and with the participation of the Company’s management, including the Company’s Chief Executive Officer and the Company’s Chief Financial Officer, of the effectiveness of the design and operation of the Company’s disclosure controls and procedures, as such term is defined in Rule 13a-15(e) of the Exchange Act. Based on the evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures are effective to ensure that information required to be disclosed by the Company in the reports it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms.

26

Changes in Internal Control Over Financial Reporting

There has been no change in the Company’s internal control over financial reporting that occurred during the Company’s quarter ended February 29, 2016 that has materially affected, or is reasonably likely to materially affect, such internal control over financial reporting.

27

PART II—OTHER INFORMATION

ITEM 1.Legal Proceedings

There have been no material developments with regard to any matters disclosed under Part I, Item 3 “Legal Proceedings” in our 2015 Annual Report.

See Note 11 - Commitments and Contingencies to the condensed consolidated financial statements included in this report for a description of our legal proceedings.

ITEM 1.A.Risk Factors

In addition to the other information set forth in this report, you should carefully consider the risk factors discussed under the “Risk Factors” section included in our 2015 Annual Report. There have been no material changes to the risk factors previously disclosed in the 2015 Annual Report.

ITEM 2.Unregistered Sale of Equity Securities and Use of Proceeds

(a) Sales of Unregistered Securities

None.

(b) Use of Proceeds from Public Offering of Common Stock

None.

(c) Repurchases of Our Equity Securities

The following table sets forth the shares of our common stock we acquired during the quarter pursuant to the surrender of shares by employees to satisfy the minimum tax withholding obligations in connection with the vesting of restricted stock units.

Fiscal Month Ending	Total Number of Shares (or Units) Purchased	Average Price Paid per Share (or Unit)
January 31, 2016	1,706	$	19.61

ITEM 3.Defaults Upon Senior Securities

None.

ITEM 4.Mine Safety Disclosures

Not applicable.

ITEM 5.Other Information

None.

28

ITEM 6.Exhibits

Exhibit No.	Description
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
32.1	Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Schema Document
101.CAL	XBRL Calculation Linkbase Document
101.LAB	XBRL Labels Linkbase Document
101.PRE	XBRL Presentation Linkbase Document
101.DEF	XBRL Definition Linkbase Document

29

Signatures

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 thereunto duly authorized.

MISTRAS GROUP, INC.
By:	/s/ Jonathan H. Wolk
	Jonathan H. Wolk
	Executive Vice President, Chief Financial Officer and Treasurer
	(Principal Financial and Accounting Officer and duly authorized officer)

Date: April 7, 2016

30

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO RULE 13A-14(a) OF THE SECURITIES

EXCHANGE ACT OF 1934

I, Sotirios J. Vahaviolos, certify that:

1. I have reviewed this report on Form 10-Q of Mistras Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 7, 2016

/s/ Sotirios J. Vahaviolos

Sotirios J. Vahaviolos

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO RULE 13A-14(a) OF THE SECURITIES

EXCHANGE ACT OF 1934

I, Jonathan H. Wolk, certify that:

1. I have reviewed this report on Form 10-Q of Mistras Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 7, 2016

/s/ Jonathan H. Wolk

Jonathan H. Wolk

Executive Vice President, Chief Financial Officer and Treasurer

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned hereby certifies, for the purposes of section 1350 of chapter 63 of title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Mistras Group, Inc. (the “Company”), that, to his knowledge, the Quarterly Report on Form 10-Q of the Company for the quarter ended February 29, 2016 (the “Report”), fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This written statement is being furnished to the Securities and Exchange Commission as an exhibit to the Report.

Dated: April 7, 2016

/s/ Sotirios J. Vahaviolos

Sotirios J. Vahaviolos

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

/s/ Jonathan H. Wolk

Jonathan H. Wolk

Executive Vice President, Chief Financial Officer and Treasurer

(Principal Financial Officer)

XML

Document and Entity Information - shares	9 Months Ended
	Feb. 29, 2016	Apr. 01, 2016
Document and Entity Information
Entity Registrant Name	Mistras Group, Inc.
Entity Central Index Key	0001436126
Document Type	10-Q
Document Period End Date	Feb. 29, 2016
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		28,924,214
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Feb. 29, 2016	May. 31, 2015
Current Assets
Cash and cash equivalents	$ 18,095	$ 10,555
Accounts receivable, net	128,605	133,228
Inventories	9,880	10,841
Deferred income taxes	4,738	5,144
Prepaid expenses and other current assets	13,263	11,698
Total current assets	174,581	171,466
Property, plant and equipment, net	75,665	79,256
Intangible assets, net	44,331	51,276
Goodwill	166,719	166,414
Deferred income taxes	804	1,208
Other assets	1,857	2,107
Total assets	463,957	471,727
Current Liabilities
Accounts payable	10,240	10,529
Accrued expenses and other current liabilities	53,184	55,914
Current portion of long-term debt	12,488	17,902
Current portion of capital lease obligations	6,864	8,646
Income taxes payable	2,126	532
Total current liabilities	84,902	93,523
Long-term debt, net of current portion	74,878	95,557
Obligations under capital leases, net of current portion	10,653	10,717
Deferred income taxes	19,150	16,984
Other long-term liabilities	7,482	9,934
Total liabilities	$ 197,065	$ 226,715
Commitments and contingencies
Equity
Preferred stock, 10,000,000 shares authorized	$ 0	$ 0
Common stock, $0.01 par value, 200,000,000 shares authorized	290	287
Additional paid-in capital	212,013	208,064
Retained earnings	79,464	57,581
Accumulated other comprehensive loss	(24,991)	(21,113)
Total Mistras Group, Inc. stockholders’ equity	266,776	244,819
Noncontrolling interests	116	193
Total equity	266,892	245,012
Total liabilities and equity	$ 463,957	$ 471,727

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Feb. 29, 2016	May. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000

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Unaudited Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Income Statement [Abstract]
Revenue	$ 160,355	$ 163,100	$ 534,994	$ 536,566
Cost of revenue	112,357	119,356	368,477	382,018
Depreciation	5,189	5,010	15,509	14,781
Gross profit	42,809	38,734	151,008	139,767
Selling, general and administrative expenses	33,747	32,758	103,591	105,158
Research and engineering	677	644	1,899	1,922
Depreciation and amortization	2,742	3,104	8,345	9,998
Acquisition-related (benefit), net	(115)	(1,642)	(1,086)	(3,037)
Income from operations	5,758	3,870	38,259	25,726
Interest expense	1,123	1,161	4,380	3,418
Income before provision for income taxes	4,635	2,709	33,879	22,308
Provision for income taxes	1,034	941	12,001	8,457
Net income	3,601	1,768	21,878	13,851
Less: net (income) loss attributable to noncontrolling interests, net of taxes	(8)	49	12	59
Net income attributable to Mistras Group, Inc.	$ 3,593	$ 1,817	$ 21,890	$ 13,910
Earnings per common share
Basic (in dollars per share)	$ 0.12	$ 0.06	$ 0.76	$ 0.49
Diluted (in dollars per share)	$ 0.12	$ 0.06	$ 0.74	$ 0.47
Weighted average common shares outstanding:
Basic (in shares)	28,906	28,656	28,832	28,583
Diluted (in shares)	29,899	29,529	29,760	29,559

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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,601	$ 1,768	$ 21,878	$ 13,851
Other comprehensive (loss):
Foreign currency translation adjustments	(2,842)	(10,694)	(3,878)	(18,610)
Comprehensive income (loss)	759	(8,926)	18,000	(4,759)
Less: comprehensive loss (income) attributable to noncontrolling interest	(8)	49	12	59
Comprehensive income (loss) attributable to Mistras Group, Inc.	$ 751	$ (8,877)	$ 18,012	$ (4,700)

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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Cash flows from operating activities
Net income	$ 21,878	$ 13,851
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	23,854	24,779
Deferred income taxes	2,880	2,177
Share-based compensation expense	4,997	4,856
Fair value adjustment to contingent consideration liabilities	(1,292)	(3,266)
Other	85	520
Changes in operating assets and liabilities, net of effect of acquisitions of businesses:
Accounts receivable	1,378	12,207
Inventories	1,235	(735)
Prepaid expenses and other current assets	(2,128)	(4,522)
Other assets	102	(571)
Accounts payable	(66)	(8,037)
Accrued expenses and other liabilities	1,197	(4,594)
Income taxes payable	1,682	(2,149)
Net cash provided by operating activities	55,802	34,516
Cash flows from investing activities
Purchase of property, plant and equipment	(11,421)	(11,757)
Purchase of intangible assets	(894)	(581)
Acquisition of businesses, net of cash acquired	(1,709)	(34,671)
Proceeds from sale of equipment	1,056	872
Net cash used in investing activities	(12,968)	(46,137)
Cash flows from financing activities
Repayment of capital lease obligations	(5,577)	(6,005)
Proceeds from borrowings of long-term debt	2,293	1,145
Repayment of long-term debt	(16,991)	(11,741)
Proceeds of revolver	45,100	99,200
Repayments of revolver	(56,100)	(62,100)
Payment of contingent consideration for business acquisitions	(2,090)	(3,034)
Taxes paid related to net share settlement of share-based awards	(1,068)	(1,462)
Excess tax benefit from share-based compensation	(266)	382
Proceeds from the exercise of stock options	361	682
Net cash (used in) provided by financing activities	(34,338)	17,067
Effect of exchange rate changes on cash and cash equivalents	(956)	(2,081)
Net change in cash and cash equivalents	7,540	3,365
Cash and cash equivalents
Beginning of period	10,555	10,020
End of period	18,095	13,385
Supplemental disclosure of cash paid
Interest	4,148	2,456
Income taxes	7,875	12,388
Noncash investing and financing
Equipment acquired through capital lease obligations	3,957	5,502
Issuance of notes payable	$ 0	$ 20,488

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Description of Business and Basis of Presentation

9 Months Ended

Feb. 29, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

Description of Business and Basis of Presentation

Description of Business

Mistras Group, Inc. and subsidiaries ("the Company") is a leading “one source” global provider of technology-enabled asset protection solutions used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure. The Company combines industry-leading products and technologies, expertise in mechanical integrity (MI) and non-destructive testing (NDT) services and proprietary data analysis software to deliver a comprehensive portfolio of customized solutions, ranging from routine inspections to complex, plant-wide asset integrity assessments and management. These mission critical solutions enhance customers’ ability to extend the useful life of their assets, increase productivity, minimize repair costs, comply with governmental safety and environmental regulations, manage risk and avoid catastrophic disasters. The Company serves a global customer base of companies with asset-intensive infrastructure, including companies in the oil and gas, fossil and nuclear power, alternative and renewable energy, public infrastructure, chemicals, commercial aerospace and defense, transportation, primary metals and metalworking, pharmaceutical/biotechnology and food processing industries and research and engineering institutions.

Basis of Presentation

The condensed consolidated financial statements contained in this report are unaudited. In the opinion of management, the condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the fiscal years ending May 31, 2016 and 2015. Reference to a fiscal year means the fiscal year ended May 31. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the notes to the audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K (“2015 Annual Report”) for fiscal 2015, as filed with the Securities and Exchange Commission on August 12, 2015.

Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements include the accounts of Mistras Group, Inc. and its wholly and majority-owned subsidiaries. For subsidiaries in which the Company’s ownership interest is less than 100%, the noncontrolling interests are reported in stockholders’ equity in the accompanying condensed consolidated balance sheets. The noncontrolling interests in net income, net of tax, is classified separately in the accompanying condensed consolidated statements of income.

All significant intercompany accounts and transactions have been eliminated in consolidation. Mistras Group, Inc.’s and its subsidiaries’ fiscal years end on May 31 except for the subsidiaries in the International segment, which end on April 30. Accordingly, the Company’s International segment subsidiaries are consolidated on a one month lag. Therefore, in the quarter and year of acquisition, results of acquired subsidiaries in the International segment are generally included in consolidated results for one less month than the actual number of months from the acquisition date to the end of the reporting period. Management does not believe that any events occurred during the one-month lag period that would have a material effect on the Company’s condensed consolidated financial statements.

Reclassification

Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.

Immaterial Correction

Subsequent to the issuance of its interim condensed consolidated financial statements as of and for the three and nine months ended February 28, 2015, the Company identified errors related to the classification of amounts reported in the Condensed Consolidated Statement of Cash Flows for that period. In accordance with the SEC Staff Accounting Bulletin (SAB) No. 99, Materiality, and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements, management evaluated the materiality of the errors from qualitative and quantitative perspectives, and concluded that the errors were immaterial. Accordingly, management has corrected the presentation of the affected line items of the accompanying Condensed Consolidated Statement of Cash Flows for the nine months ended February 28, 2015, as summarized below. These changes did not impact the Company’s net income, balance sheet, or stockholders’ equity for any periods previously reported.

	Previously Reported		Revised
Cash flows from operating activities
Accounts payable	(7,741	)	(8,037	)
Accrued expenses and other liabilities	(5,089	)	(4,594	)
Net cash provided by operating activities	34,317		34,516
Cash flows from investing activities
Acquisition of businesses, net of cash acquired	(34,967	)	(34,671	)
Net cash used in investing activities	(46,433	)	(46,137	)
Cash flows from financing activities
Proceeds from borrowings of long-term debt	—		1,145
Repayments of long-term debt	(10,596	)	(11,741	)
Net borrowings against revolver	35,544		37,100
Net cash provided by financing activities	15,511		17,067
Effect of exchange rate changes on cash and cash equivalents	(30	)	(2,081	)

Significant Accounting Policies

The Company’s significant accounting policies are disclosed in Note 2 — Summary of Significant Accounting Policies in the Company's 2015 Annual Report. On an ongoing basis, the Company evaluates its estimates and assumptions, including, among other things those related to revenue recognition, valuations of accounts receivable, long-lived assets, goodwill, deferred tax assets and uncertain tax positions. Since the date of the 2015 Annual Report, there have been no material changes to the Company's significant accounting policies.

Income Taxes

The Company provides for income taxes in interim periods in an amount that aligns its year-to-date tax provision with the effective income tax rate expected for the full year, plus adjustments to certain discrete tax items. During the three months ended February 29, 2016 and February 28, 2015, the Company's effective income tax rate differed from the statutory rate principally due to adjustments to certain discrete tax items related to the resolution and adjustment of certain income tax contingencies, which decreased the effective tax rate by 11% and 8%, respectively.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years and interim periods within those fiscal years beginning December 15, 2017, as a result of a one year deferral in the standard issued by the FASB in August 2015 with ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures.

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. This amendment will simplify the accounting for adjustments made to provisional amounts recognized in a business combination and eliminates the requirement to retrospectively account for those adjustments in previous reporting periods. This update will require on the face of the income statement or in the notes to the financial statements the amount recorded in current-period earnings that would have previously been recorded if the adjustment to the provisional amounts had been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2015. This update should be applied prospectively and earlier adoption is permitted for financial statements that have not been issued. The Company is evaluating the effect that ASU 2015-16 will have on its condensed consolidated financial statements and related disclosures.

In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. This amendment will simplify the presentation of deferred tax assets and liabilities on the balance sheet and require all deferred tax assets and liabilities to be treated as non-current. ASU 2015-17 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2016, with early adoption permitted. The Company is evaluating the effect that ASU 2015-17 will have on its condensed consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This amendment supersedes previous accounting guidance (Topic 840) and requires all leases, with exception of leases with a term of 12 months or less, to be recorded on the balance sheet as lease assets and lease liabilities. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018, with early adoption permitted. The standard requires lessees and lessors to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is evaluating the effect that ASU 2016-02 will have on its condensed consolidated financial statements and related disclosures.

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Share-Based Compensation

9 Months Ended

Feb. 29, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

The Company has share-based incentive awards outstanding to its eligible employees and Directors under two equity incentive plans: (i) the 2007 Stock Option Plan (the 2007 Plan), and (ii) the 2009 Long-Term Incentive Plan (the 2009 Plan). No further awards may be granted under the 2007 Plan, although awards granted under the 2007 Plan remain outstanding in accordance with their terms. Awards granted under the 2009 Plan may be in the form of stock options, restricted stock units and other forms of share-based incentives, including performance restricted stock units, stock appreciation rights and deferred stock rights.

Stock Options

For the three and nine months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to stock option awards of less than $0.1 million for each period, respectively. As of February 29, 2016, there was less than $0.1 million of unrecognized compensation costs, net of estimated forfeitures, related to stock option awards, which are expected to be recognized over a remaining weighted average period of less than 0.1 years.

No stock options were granted during the nine months ended February 29, 2016 and February 28, 2015.

Restricted Stock Unit Awards

For the three months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to restricted stock unit awards of $1.1 million and $1.2 million, respectively. For the nine months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to restricted stock unit awards of $3.3 million and $3.5 million, respectively. As of February 29, 2016, there was $8.3 million of unrecognized compensation costs, net of estimated forfeitures, related to restricted stock unit awards, which are expected to be recognized over a remaining weighted average period of 2.3 years.

During the first nine months of fiscal 2016 and 2015, the Company granted approximately 28,000 and 21,000 shares, respectively, of fully-vested common stock to its five non-employee directors, in connection with its non-employee director compensation plan. These shares had grant date fair values of $0.5 million and $0.4 million, respectively, which was recorded as share-based compensation expense during the nine months ended February 29, 2016 and February 28, 2015, respectively.

During the first nine months of fiscal 2016 and 2015, approximately 220,000 and 231,000 restricted stock units, respectively, vested. The fair value of these units was $3.5 million and $5.2 million, respectively. Upon vesting, restricted stock units are generally net share-settled to cover the required minimum withholding tax and the remaining amount is converted into an equivalent number of shares of common stock.

Performance Restricted Stock Units

In the third quarter of fiscal 2014, the Company granted one-year, two-year and three-year performance restricted stock units to its executive officers and certain other senior officers. In the second quarter of fiscal 2015, the Company granted performance restricted stock units to its executive and certain other senior officers. In the first quarter of fiscal 2016, the Company modified its equity compensation program and granted 154,000 performance restricted stock units to its executive and certain other senior officers. As a condition for receiving any awards under the revised fiscal 2016 plan, the executive and senior officers surrendered and released all rights to receive any shares under the three-year 2014 awards and three-year 2015 awards with a performance or market condition. The Company has accounted for the fiscal 2016 awards as modifications in accordance with ASC 718, Compensation - Stock Compensation. These units have requisite service periods of five years and have no dividend rights. The actual payout of these units will vary based on the Company’s performance over a one-year period based on three metrics related to the Company’s fiscal 2016 performance: (1) Operating Income, (2) Adjusted EBITDAS, which is consistent with Adjusted EBITDA as disclosed in the financial statements, which is net income before interest, taxes, depreciation, amortization, non-cash stock-based compensation expense, acquisition related items, and other non-routine items as determined by the Committee and (3) Revenue. There is also a discretionary portion based on individual performance. During the three months ended November 30, 2015, the Company evaluated the expected performance metrics and increased the estimated performance shares expected to be granted by 80,000 units to a total of 234,000 units. No adjustment was required during the three months ended February 29, 2016.

Compensation costs are initially measured assuming that the target performance conditions will be achieved. However, compensation costs related to the performance conditions are adjusted for subsequent changes in the expected outcomes of the performance conditions. The discretionary portion of these awards are liability-classified and adjusted to fair value each reporting period. Compensation costs for the discretionary portion of the awards are recognized over the same five year requisite service period as the awards based on the Company’s fiscal 2016 performance. For the three months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense/(benefit) related to performance restricted stock units, inclusive of all awards noted above, of approximately $0.4 million and $(0.8) million, respectively. For the nine months ended February 29, 2016 and February 28, 2015, the Company recognized share-based compensation expense related to these units of approximately $1.2 million and $0.9 million, respectively. At February 29, 2016, there was $3.4 million of total unrecognized compensation costs related to the 234,000 non-vested performance restricted stock units, which are expected to be recognized over a remaining weighted average period of 3.8 years.

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Earnings per Share

9 Months Ended

Feb. 29, 2016

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

Basic earnings per share is computed by dividing net income by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (1) the weighted-average number of shares of common stock outstanding during the period, and (2) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted-average shares outstanding (denominator), diluted shares reflects: (i) only the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common shares during the period and (ii) the pro forma vesting of restricted stock units.

The following table sets forth the computations of basic and diluted earnings per share:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Basic earnings per share
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Basic earnings per share	$	0.12	$	0.06	$	0.76	$	0.49
Diluted earnings per share:
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Dilutive effect of stock options outstanding	739		694		657		742
Dilutive effect of restricted stock units outstanding	254		179		271		234
	29,899		29,529		29,760		29,559
Diluted earnings per share	$	0.12	$	0.06	$	0.74	$	0.47

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Acquisitions

9 Months Ended

Feb. 29, 2016

Business Combinations [Abstract]

Acquisitions

Acquisitions

Acquisitions

In the first nine months of fiscal 2016, the Company completed one acquisition. The Company purchased a company that provides unmanned aerial systems and NDT services, located in the U.S.

In this acquisition, the Company acquired 100% of the common stock of the acquiree in exchange for consideration of $1.8 million in cash and contingent consideration estimated to be $0.9 million to be earned based upon the acquired business achieving specific performance metrics over the initial four years of operations from the acquisition date. The Company accounted for this transaction in accordance with the acquisition method of accounting for business combinations.

The assets and liabilities of the business acquired in fiscal 2016 were included in the Company's condensed consolidated balance sheet based upon their estimated fair values on the date of acquisition as determined in a preliminary purchase price allocation, using available information and making assumptions management believes are reasonable. The Company is still in the process of completing its valuation of the assets, both tangible and intangible, and liabilities acquired. The results of operations for this acquisition is included in the Services segment's results from the date of acquisition. The Company's preliminary purchase price allocations are included in the table below, summarizing the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:

	Fiscal
	2016
Number of Entities	1
Consideration transferred:
Cash paid	$	1,750
Contingent consideration	945
Consideration transferred	2,695
Current assets	145
Property, plant and equipment	485
Goodwill	2,658
Current liabilities	(521		)
Long-term deferred tax liability	(72		)
Net assets acquired	$	2,695

In the first nine months of fiscal 2015, the Company completed four acquisitions. The Company purchased a company, located in Louisiana, a provider of maintenance and inspection services primarily on offshore platforms. This acquisition expanded the service offerings within the Services segment, allowing the Company to provide services to the upstream operations of its customers. The Company also purchased a group of asset protection businesses located in Quebec, Canada and an asset inspection business in Florida to complement service offerings within the Company’s Services segment and continue its market expansion strategy. The Company’s International Segment completed an acquisition of an asset inspection business located in the United Kingdom.

In these acquisitions, the Company acquired 100% of the common stock or certain assets of each acquiree in exchange for aggregate consideration of approximately $35.7 million in cash and $20.5 million in notes payable issued as part of the acquisitions. The Company accounted for these transactions in accordance with the acquisition method of accounting for business combinations. In addition, the acquisitions in Quebec and Florida provided for contingent consideration of up to $3.2 million to be earned based upon the acquired business achieving specific performance metrics over the initial two to three years of operation from the acquisition date.

The amortization period of intangible assets acquired in fiscal 2015 ranges from 3 to 10 years. The Company recorded $45.2 million of goodwill in connection with these acquisitions, reflecting the strategic fit and revenue and earnings growth potential of these businesses.

Acquisition-Related Expense

During the three and nine month periods ended February 29, 2016, the Company incurred acquisition-related costs of $0.1 million and $0.2 million, respectively, in connection with due diligence, professional fees, and other expenses for its acquisition activities. Additionally, the Company adjusted the fair value of certain previously recorded acquisition-related contingent consideration liabilities. These adjustments resulted in a net decrease of acquisition-related contingent consideration liabilities and a corresponding increase in income from operations of $0.2 million and $1.3 million, for the three and nine month periods ended February 29, 2016, respectively. The Company’s aggregate acquisition-related contingent consideration liabilities were $3.8 million and $6.4 million as of February 29, 2016 and May 31, 2015, respectively.

During the three and nine month periods ended February 28, 2015, the Company incurred acquisition-related costs of $0.2 million in connection with due diligence, professional fees, and other expenses for its acquisition activities. Additionally, the Company adjusted the fair value of certain previously recorded acquisition-related contingent consideration liabilities. For the three and nine month periods ended February 28, 2015, these adjustments resulted in a net decrease of acquisition-related contingent consideration liabilities and a corresponding increase in income from operations of $1.7 million and $3.3 million, respectively.

The fair value adjustments to acquisition-related contingent consideration liabilities and the acquisition-related transaction costs have been classified as acquisition-related expense, net, in the condensed consolidated statements of income for the three and nine month periods ended February 29, 2016 and February 28, 2015.

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Accounts Receivable, net

9 Months Ended

Feb. 29, 2016

Receivables [Abstract]

Accounts Receivable, net

Accounts Receivable, net

Accounts receivable consisted of the following:

	February 29, 2016			May 31, 2015
Trade accounts receivable	$	132,340		$	136,208
Allowance for doubtful accounts	(3,735		)	(2,980		)
Accounts receivable, net	$	128,605		$	133,228

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Property, Plant and Equipment, net

9 Months Ended

Feb. 29, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, net

Property, Plant and Equipment, net

Property, plant and equipment consisted of the following:

	Useful Life (Years)	February 29, 2016			May 31, 2015
Land		$	1,719		$	1,856
Buildings and improvements	30-40	18,534			17,712
Office furniture and equipment	5-8	8,653			8,084
Machinery and equipment	5-7	166,379			162,612
		195,285			190,264
Accumulated depreciation and amortization		(119,620		)	(111,008		)
Property, plant and equipment, net		$	75,665		$	79,256

Depreciation expense for the three months ended February 29, 2016 and February 28, 2015 was $5.5 million and $5.4 million, respectively. Depreciation expense for the nine months ended February 29, 2016 and February 28, 2015 was $16.7 million and $16.3 million, respectively.

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Goodwill

9 Months Ended

Feb. 29, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill

The changes in the carrying amount of goodwill by segment is shown below:

	Services			International			Products		Total
Balance at May 31, 2014	$	73,767		$	43,552		$	13,197	$	130,516
Goodwill acquired during the year	41,986			1,480			—		43,466
Adjustments to preliminary purchase price allocations	3,529			(367		)	—		3,162
Foreign currency translation	(2,003		)	(8,727		)	—		(10,730		)
Balance at May 31, 2015	$	117,279		$	35,938		$	13,197	$	166,414
Goodwill acquired (disposed) during the year	2,658			(374		)	—		2,284
Adjustments to preliminary purchase price allocations	271			—			—		271
Foreign currency translation	(1,034		)	(1,216		)	—		(2,250		)
Balance at February 29, 2016	$	119,174		$	34,348		$	13,197	$	166,719

The Company reviews goodwill for impairment on a reporting unit basis on March 1 of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. As of February 29, 2016, the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable.

The Company's cumulative goodwill impairment as of February 29, 2016, May 31, 2015 and May 31, 2014 was $9.9 million, which is within its International segment.

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Intangible Assets

9 Months Ended

Feb. 29, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

Intangible Assets

The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:

		February 29, 2016							May 31, 2015
	Useful Life (Years)	Gross Amount		Accumulated Amortization			Net Carrying Amount		Gross Amount		Accumulated Amortization			Net Carrying Amount
Customer relationships	5-12	$	79,577	$	(45,469	)	$	34,108	$	81,101	$	(41,009	)	$	40,092
Software/Technology	3-15	17,055		(11,377		)	5,678		15,738		(10,290		)	5,448
Covenants not to compete	2-5	11,618		(9,102		)	2,516		11,678		(8,605		)	3,073
Other	2-5	6,820		(4,791		)	2,029		6,910		(4,247		)	2,663
Total		$	115,070	$	(70,739	)	$	44,331	$	115,427	$	(64,151	)	$	51,276

Amortization expense for the three months ended February 29, 2016 and February 28, 2015 was $2.4 million and $2.7 million, respectively. Amortization expense for the nine months ended February 29, 2016 and February 28, 2015 was $7.2 million and $8.5 million, respectively.

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Accrued Expenses and Other Current Liabilities

9 Months Ended

Feb. 29, 2016

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	February 29, 2016		May 31, 2015
Accrued salaries, wages and related employee benefits	$	27,274	$	26,053
Contingent consideration, current portion	1,508		3,543
Accrued workers’ compensation and health benefits	5,933		3,630
Deferred revenue	4,302		3,841
Other accrued expenses	14,167		18,847
Total accrued expenses and other liabilities	$	53,184	$	55,914

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Long-Term Debt

9 Months Ended

Feb. 29, 2016

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

Long-term debt consisted of the following:

	February 29, 2016			May 31, 2015
Senior credit facility	$	71,528		$	83,062
Notes payable	10,368			24,933
Other	5,470			5,464
Total debt	87,366			113,459
Less: Current portion	(12,488		)	(17,902		)
Long-term debt, net of current portion	$	74,878		$	95,557

Senior Credit Facility

On October 31, 2014, the Company entered into a Third Amendment and Modification Agreement, to its revolving line of credit, the Third Amended and Restated Credit Agreement (“Credit Agreement”) with Bank of America, N.A., as agent for the lenders and a lender, and JPMorgan Chase Bank, N.A., Keybank, National Association and TD Bank, N.A., as lenders. The Credit Agreement provides the Company with a $175.0 million revolving line of credit, which, under certain circumstances, the line of credit can be increased to $225.0 million. The Company may borrow up to $30.0 million in non-U.S. Dollar currencies and use up to $10.0 million of the credit limit for the issuance of letters of credit. The Credit Agreement has a maturity date of October 30, 2019. As of February 29, 2016, the Company had borrowings of $71.5 million and a total of $4.5 million of letters of credit outstanding under the Credit Agreement.

Loans under the Credit Agreement bear interest at LIBOR plus an applicable LIBOR margin ranging from 1% to 1.75%, or a base rate less a margin of 1.25% to 0.375%, at the option of the Company, based upon the Company’s Funded Debt Leverage Ratio. Funded Debt Leverage Ratio is generally the ratio of (1) all outstanding indebtedness for borrowed money and other interest-bearing indebtedness as of the date of determination to (2) EBITDA (which is (a) net income, less (b) income (or plus loss) from discontinued operations and extraordinary items, plus (c) income tax expenses, plus (d) interest expense, plus (e) depreciation, depletion, and amortization (including non-cash loss on retirement of assets), plus (f) stock compensation expense, less (g) cash expense related to stock compensation, plus or minus certain other adjustments) for the period of four consecutive fiscal quarters immediately preceding the date of determination. The Company has the benefit of the lowest margin if its Funded Debt Leverage Ratio is equal to or less than 0.5 to 1, and the margin increases as the ratio increases, to the maximum margin if the ratio is greater than 2.0 to 1. The Company will also bear additional costs for market disruption, regulatory changes effecting the lenders’ funding costs, and default pricing of an additional 2% interest rate margin on any amounts not paid when due. Amounts borrowed under the Credit Agreement are secured by liens on substantially all of the assets of the Company.

The Credit Agreement contains financial covenants requiring that the Company maintain a Funded Debt Leverage Ratio of no greater than 3.25 to 1 and an Interest Coverage Ratio of at least 3.0 to 1. Interest Coverage Ratio means the ratio, as of any date of determination, of (a) EBITDA for the 12 month period immediately preceding the date of determination, to (b) all interest, premium payments, debt discount, fees, charges and related expenses of the Company and its subsidiaries in connection with borrowed money (including capitalized interest) or in connection with the deferred purchase price of assets, in each case to the extent treated as interest in accordance with GAAP, paid during the 12 month period immediately preceding the date of determination. The Credit Agreement also limits the Company’s ability to, among other things, create liens, make investments, incur more indebtedness, merge or consolidate, make dispositions of property, pay dividends and make distributions to stockholders, enter into a new line of business, enter into transactions with affiliates and enter into burdensome agreements. The Credit Agreement does not limit the Company’s ability to acquire other businesses or companies except that the acquired business or company must be in the Company's line of business, the Company must be in compliance with the financial covenants on a pro forma basis after taking into account the acquisition, and, if the acquired business is a separate subsidiary, in certain circumstances the lenders will receive the benefit of a guaranty of the subsidiary and liens on its assets and a pledge of its stock.

As of February 29, 2016, the Company was in compliance with the terms of the Credit Agreement, and will continuously monitor its compliance with the covenants contained in its credit agreement.

Notes Payable and Other

In connection with certain of its acquisitions through fiscal 2015, the Company issued subordinated notes payable to the sellers. The maturity of the notes that remain outstanding range from two to five years from the date of acquisition with stated interest rates ranging from 0% to 4%. The Company has discounted these obligations to reflect a 2% to 4% market interest. Unamortized discount on the notes was de minimis as of February 29, 2016 and May 31, 2015. Amortization is recorded as interest expense in the condensed consolidated statements of income.

The Company has evaluated current market conditions and borrower credit quality and has determined that the carrying value of its long-term debt approximates fair value. The fair value of the Company’s notes payable and capital lease obligations approximates their carrying amounts based on anticipated interest rates which management believes would currently be available to the Company for similar issuances of debt.

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Fair Value Measurements

9 Months Ended

Feb. 29, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It also establishes a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of the hierarchy are defined as follows:

Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 — Observable inputs other than quoted prices included in Level 1, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data.

Level 3 — Unobservable inputs reflecting the Company’s own assumptions about inputs that market participants would use in pricing the asset or liability based on the best information available.

In accordance with the fair value hierarchy described above, the following table shows the fair value of the Company’s financial liabilities that are required to be remeasured at fair value on a recurring basis:

	February 29, 2016
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	3,808	$	3,808
Total Liabilities	$	—	$	—	$	3,808	$	3,808

	May 31, 2015
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	6,411	$	6,411
Total Liabilities	$	—	$	—	$	6,411	$	6,411

The fair value of contingent consideration liabilities that was classified as Level 3 in the table above was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements.

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Commitments and Contingencies

9 Months Ended

Feb. 29, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Litigation and Government Investigations

The Company is subject to periodic lawsuits, investigations and claims that arise in the ordinary course of business. Although the Company cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against it, the Company does not believe that any currently pending legal proceeding to which the Company is a party will have a material adverse effect on its business, results of operations, cash flows or financial condition, except for the proceedings described below for which the Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability estimate. The costs of defense and amounts that may be recovered against the Company in such matters may be covered by insurance, except that the primary claims set forth in the purported class action case in California is excluded from insurance coverage.

Litigation and Commercial Claims

In April 2015, two separate lawsuits were filed in California as purported class action lawsuits on behalf of current and former Mistras employees. The cases are David Kruger v Mistras Group, Inc., filed in the U.S. District Court for the Eastern District of California and Edgar Viceral v Mistras Group, et al, pending in the U.S. District Court for the Northern District of California. Both cases were originally filed in California state court and were removed to the respective U.S. District Courts for the districts in which the state court cases were filed. These two cases have been consolidated, with Kruger dismissing his case and joining the Viceral case. As part of this consolidation, the claims in the Kruger case that were not part of the Viceral case were added to the Viceral case by the filing of an amended complaint. The consolidated case alleges violations of California statutes primarily, the California Labor Code, and seeks to proceed as a collective action under the U.S. Fair Labor Standards Act. The case is predicated on claims for allegedly missed rest and meal periods, inaccurate wage statements, and failure to pay all wages due, as well as related unfair business practices, and is requesting payment of all damages, including unpaid wages, and various fines and penalties available under California law. The parties met with a mediator on April 5, 2016 but no resolution of the case was reached, though the Company anticipates discussions regarding resolution may continue. The Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability, if any, related to these matters, and accordingly, has not established any reserves for these matters.

During fiscal 2012 and 2013, the Company performed radiography work on the construction of pipeline projects in the U.S. The Company has received notice that the owner of the pipeline projects contends that certain of the x-ray images the Company’s technicians prepared regarding the projects did not meet the code quality interpretation standards required by API (American Petroleum Institute) 1103. The projects' owner is claiming damages as a result of the alleged quality defects of the Company’s x-ray images. No lawsuit has been filed at this time. The Company is currently unable to determine the likely outcome or reasonably estimate the amount or range of potential liability related to this matter, and accordingly, has not established any reserves for this matter.

Government Investigations

In May 2015, the Company received a notice from the U.S. Environmental Protection Agency (“EPA”) that it performed a preliminary assessment at a leased facility the Company operates in Cudahy, California. Based upon the preliminary assessment, the EPA is conducting an investigation of the site, which includes taking groundwater and soil samples. The purpose of the investigation is to determine whether any hazardous materials were released from the facility. The Company has been informed that certain hazardous materials and pollutants have been found in the ground water in the general vicinity of the site and the EPA is attempting to ascertain the origination or source of these materials and pollutants. Given the historic industrial use of the site, the EPA determined that the site of the Cudahy facility should be examined, along with numerous other sites in the vicinity. At this time, the Company is unable to determine whether it has any liability in connection with this matter and if so, the amount or range of any such liability, and accordingly, has not established any reserves for this matter.

In January 2012, the Company received notice of a governmental investigation concerning an environmental incident which occurred in February 2011 outside on the premises of the Cudahy facility.  No human injury or property damage was reported or appears to have been caused as a result of this incident. While management cannot predict the ultimate outcome of this matter, based on its internal investigation to date, the Company does not believe the outcome will have a material effect on its financial condition or results of operations. To the Company’s knowledge, this matter has been dormant since fiscal 2012.

Acquisition-related contingencies

The Company is liable for contingent consideration in connection with certain of its acquisitions. As of February 29, 2016, total potential acquisition-related contingent consideration ranged from zero to approximately $17.8 million and would be payable upon the achievement of specific performance metrics by certain of the acquired companies over the next 3.3 years of operations. See Note 4 - Acquisitions to these condensed consolidated financial statements for further discussion of the Company’s acquisitions.

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Segment Disclosure

9 Months Ended

Feb. 29, 2016

Segment Reporting [Abstract]

Segment Disclosure

Segment Disclosure

The Company’s three operating segments are:

• Services. This segment provides asset protection solutions primarily in North America with the largest concentration in the United States and the Canadian services business, consisting primarily of non-destructive testing and inspection and engineering services that are used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure.

• International. This segment offers services, products and systems similar to those of the Company’s other two segments to global markets, principally in Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by the Products and Systems segment.

• Products and Systems. This segment designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States.

Allocations for general corporate services, including accounting, audit, and contract management, that are provided to the segments are reported within Corporate and eliminations. Sales to the International segment from the Products and Systems segment and subsequent sales by the International segment of the same items are recorded and reflected in the operating performance of both segments. Additionally, engineering charges and royalty fees charged to the Services and International segments by the Products and Systems segment are reflected in the operating performance of each segment. All such intersegment transactions are eliminated in the Company’s consolidated financial reporting.

Selected consolidated financial information by segment for the periods shown was as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Revenues
Services	$	123,616		$	121,845		$	411,484		$	404,651
International	31,801			33,554			107,085			114,610
Products and Systems	6,866			8,526			23,343			22,588
Corporate and eliminations	(1,928		)	(825		)	(6,918		)	(5,283		)
	$	160,355		$	163,100		$	534,994		$	536,566

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016			February 28, 2015
Gross profit
Services	$	30,256	$	27,429	$	107,943		$	101,452
International	9,227		7,018		32,113			27,795
Products and Systems	3,202		4,211		10,957			10,203
Corporate and eliminations	124		76		(5		)	317
	$	42,809	$	38,734	$	151,008		$	139,767

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Income (loss) from operations
Services	$	10,071		$	7,257		$	44,285		$	36,208
International	1,136			(1,315		)	6,925			1,163
Products and Systems	438			1,346			2,677			1,330
Corporate and eliminations	(5,887		)	(3,418		)	(15,628		)	(12,975		)
	$	5,758		$	3,870		$	38,259		$	25,726

Income (loss) by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations.

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Depreciation and amortization
Services	$	5,556		$	5,658		$	16,640		$	16,622
International	1,876			1,919			5,762			6,130
Products and Systems	587			608			1,727			1,809
Corporate and eliminations	(88		)	(71		)	(275		)	218
	$	7,931		$	8,114		$	23,854		$	24,779

	February 29, 2016		May 31, 2015
Goodwill
Services	$	119,174	$	117,279
International	34,348		35,938
Products and Systems	13,197		13,197
	$	166,719	$	166,414

	February 29, 2016		May 31, 2015
Total assets
Services	$	300,553	$	301,031
International	122,669		126,643
Products and Systems	32,753		35,464
Corporate and eliminations	7,982		8,589
	$	463,957	$	471,727

Revenues by geographic area for the three and nine months ended February 29, 2016 and 2015, respectively, were as follows:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Revenues
United States	$	109,518	$	113,664	$	371,929	$	365,912
Other Americas	17,162		14,353		52,248		53,917
Europe	29,706		31,644		100,411		106,370
Asia-Pacific	3,969		3,439		10,406		10,367
	$	160,355	$	163,100	$	534,994	$	536,566

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Description of Business and Basis of Presentation (Policies)

9 Months Ended

Feb. 29, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The condensed consolidated financial statements contained in this report are unaudited. In the opinion of management, the condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods of the fiscal years ending May 31, 2016 and 2015. Reference to a fiscal year means the fiscal year ended May 31. Certain items included in these statements are based on management’s estimates. Actual results may differ from those estimates. The results of operations for any interim period are not necessarily indicative of the results expected for the year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the notes to the audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K (“2015 Annual Report”) for fiscal 2015, as filed with the Securities and Exchange Commission on August 12, 2015.

Principles of Consolidation

Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements include the accounts of Mistras Group, Inc. and its wholly and majority-owned subsidiaries. For subsidiaries in which the Company’s ownership interest is less than 100%, the noncontrolling interests are reported in stockholders’ equity in the accompanying condensed consolidated balance sheets. The noncontrolling interests in net income, net of tax, is classified separately in the accompanying condensed consolidated statements of income.

All significant intercompany accounts and transactions have been eliminated in consolidation. Mistras Group, Inc.’s and its subsidiaries’ fiscal years end on May 31 except for the subsidiaries in the International segment, which end on April 30. Accordingly, the Company’s International segment subsidiaries are consolidated on a one month lag. Therefore, in the quarter and year of acquisition, results of acquired subsidiaries in the International segment are generally included in consolidated results for one less month than the actual number of months from the acquisition date to the end of the reporting period. Management does not believe that any events occurred during the one-month lag period that would have a material effect on the Company’s condensed consolidated financial statements.

Reclassification

Reclassification

Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years and interim periods within those fiscal years beginning December 15, 2017, as a result of a one year deferral in the standard issued by the FASB in August 2015 with ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures.

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. This amendment will simplify the accounting for adjustments made to provisional amounts recognized in a business combination and eliminates the requirement to retrospectively account for those adjustments in previous reporting periods. This update will require on the face of the income statement or in the notes to the financial statements the amount recorded in current-period earnings that would have previously been recorded if the adjustment to the provisional amounts had been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2015. This update should be applied prospectively and earlier adoption is permitted for financial statements that have not been issued. The Company is evaluating the effect that ASU 2015-16 will have on its condensed consolidated financial statements and related disclosures.

In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. This amendment will simplify the presentation of deferred tax assets and liabilities on the balance sheet and require all deferred tax assets and liabilities to be treated as non-current. ASU 2015-17 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2016, with early adoption permitted. The Company is evaluating the effect that ASU 2015-17 will have on its condensed consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This amendment supersedes previous accounting guidance (Topic 840) and requires all leases, with exception of leases with a term of 12 months or less, to be recorded on the balance sheet as lease assets and lease liabilities. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018, with early adoption permitted. The standard requires lessees and lessors to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is evaluating the effect that ASU 2016-02 will have on its condensed consolidated financial statements and related disclosures.

Fair Value Measurements

Fair Value Measurements

The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It also establishes a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of the hierarchy are defined as follows:

Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 — Observable inputs other than quoted prices included in Level 1, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data.

Level 3 — Unobservable inputs reflecting the Company’s own assumptions about inputs that market participants would use in pricing the asset or liability based on the best information available.

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Description of Business and Basis of Presentation (Tables)

9 Months Ended

Feb. 29, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Quantifying Prior Year Misstatement Corrected in Current Year Financial Statements

In accordance with the SEC Staff Accounting Bulletin (SAB) No. 99, Materiality, and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements, management evaluated the materiality of the errors from qualitative and quantitative perspectives, and concluded that the errors were immaterial. Accordingly, management has corrected the presentation of the affected line items of the accompanying Condensed Consolidated Statement of Cash Flows for the nine months ended February 28, 2015, as summarized below. These changes did not impact the Company’s net income, balance sheet, or stockholders’ equity for any periods previously reported.

	Previously Reported		Revised
Cash flows from operating activities
Accounts payable	(7,741	)	(8,037	)
Accrued expenses and other liabilities	(5,089	)	(4,594	)
Net cash provided by operating activities	34,317		34,516
Cash flows from investing activities
Acquisition of businesses, net of cash acquired	(34,967	)	(34,671	)
Net cash used in investing activities	(46,433	)	(46,137	)
Cash flows from financing activities
Proceeds from borrowings of long-term debt	—		1,145
Repayments of long-term debt	(10,596	)	(11,741	)
Net borrowings against revolver	35,544		37,100
Net cash provided by financing activities	15,511		17,067
Effect of exchange rate changes on cash and cash equivalents	(30	)	(2,081	)

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Earnings per Share (Tables)

9 Months Ended

Feb. 29, 2016

Earnings Per Share [Abstract]

Schedule of computations of basic and diluted earnings per share

The following table sets forth the computations of basic and diluted earnings per share:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Basic earnings per share
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Basic earnings per share	$	0.12	$	0.06	$	0.76	$	0.49
Diluted earnings per share:
Numerator:
Net income attributable to Mistras Group, Inc.	$	3,593	$	1,817	$	21,890	$	13,910
Denominator:
Weighted average common shares outstanding	28,906		28,656		28,832		28,583
Dilutive effect of stock options outstanding	739		694		657		742
Dilutive effect of restricted stock units outstanding	254		179		271		234
	29,899		29,529		29,760		29,559
Diluted earnings per share	$	0.12	$	0.06	$	0.74	$	0.47

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Acquisitions (Tables)

9 Months Ended

Feb. 29, 2016

Business Combinations [Abstract]

Schedule of Preliminary Purchase Price Allocation

The Company's preliminary purchase price allocations are included in the table below, summarizing the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:

	Fiscal
	2016
Number of Entities	1
Consideration transferred:
Cash paid	$	1,750
Contingent consideration	945
Consideration transferred	2,695
Current assets	145
Property, plant and equipment	485
Goodwill	2,658
Current liabilities	(521		)
Long-term deferred tax liability	(72		)
Net assets acquired	$	2,695

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Accounts Receivable, net (Tables)

9 Months Ended

Feb. 29, 2016

Receivables [Abstract]

Schedule of accounts receivable

Accounts receivable consisted of the following:

	February 29, 2016			May 31, 2015
Trade accounts receivable	$	132,340		$	136,208
Allowance for doubtful accounts	(3,735		)	(2,980		)
Accounts receivable, net	$	128,605		$	133,228

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Property, Plant and Equipment, net (Tables)

9 Months Ended

Feb. 29, 2016

Property, Plant and Equipment [Abstract]

Schedule of Property, plant and equipment

Property, plant and equipment consisted of the following:

	Useful Life (Years)	February 29, 2016			May 31, 2015
Land		$	1,719		$	1,856
Buildings and improvements	30-40	18,534			17,712
Office furniture and equipment	5-8	8,653			8,084
Machinery and equipment	5-7	166,379			162,612
		195,285			190,264
Accumulated depreciation and amortization		(119,620		)	(111,008		)
Property, plant and equipment, net		$	75,665		$	79,256

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Goodwill (Tables)

9 Months Ended

Feb. 29, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by segment is shown below:

	Services			International			Products		Total
Balance at May 31, 2014	$	73,767		$	43,552		$	13,197	$	130,516
Goodwill acquired during the year	41,986			1,480			—		43,466
Adjustments to preliminary purchase price allocations	3,529			(367		)	—		3,162
Foreign currency translation	(2,003		)	(8,727		)	—		(10,730		)
Balance at May 31, 2015	$	117,279		$	35,938		$	13,197	$	166,414
Goodwill acquired (disposed) during the year	2,658			(374		)	—		2,284
Adjustments to preliminary purchase price allocations	271			—			—		271
Foreign currency translation	(1,034		)	(1,216		)	—		(2,250		)
Balance at February 29, 2016	$	119,174		$	34,348		$	13,197	$	166,719

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Intangible Assets (Tables)

9 Months Ended

Feb. 29, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of gross amount, accumulated amortization and net carrying amount of intangible assets

The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:

		February 29, 2016							May 31, 2015
	Useful Life (Years)	Gross Amount		Accumulated Amortization			Net Carrying Amount		Gross Amount		Accumulated Amortization			Net Carrying Amount
Customer relationships	5-12	$	79,577	$	(45,469	)	$	34,108	$	81,101	$	(41,009	)	$	40,092
Software/Technology	3-15	17,055		(11,377		)	5,678		15,738		(10,290		)	5,448
Covenants not to compete	2-5	11,618		(9,102		)	2,516		11,678		(8,605		)	3,073
Other	2-5	6,820		(4,791		)	2,029		6,910		(4,247		)	2,663
Total		$	115,070	$	(70,739	)	$	44,331	$	115,427	$	(64,151	)	$	51,276

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Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Feb. 29, 2016

Payables and Accruals [Abstract]

Schedule of accrued expenses and other current liabilities

Accrued expenses and other current liabilities consisted of the following:

	February 29, 2016		May 31, 2015
Accrued salaries, wages and related employee benefits	$	27,274	$	26,053
Contingent consideration, current portion	1,508		3,543
Accrued workers’ compensation and health benefits	5,933		3,630
Deferred revenue	4,302		3,841
Other accrued expenses	14,167		18,847
Total accrued expenses and other liabilities	$	53,184	$	55,914

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Long-Term Debt (Tables)

9 Months Ended

Feb. 29, 2016

Debt Disclosure [Abstract]

Schedule of long-term debt

Long-term debt consisted of the following:

	February 29, 2016			May 31, 2015
Senior credit facility	$	71,528		$	83,062
Notes payable	10,368			24,933
Other	5,470			5,464
Total debt	87,366			113,459
Less: Current portion	(12,488		)	(17,902		)
Long-term debt, net of current portion	$	74,878		$	95,557

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Fair Value Measurements (Tables)

9 Months Ended

Feb. 29, 2016

Fair Value Disclosures [Abstract]

Schedule of fair value of the Company's financial liabilities that are required to be remeasured at fair value on a recurring basis

In accordance with the fair value hierarchy described above, the following table shows the fair value of the Company’s financial liabilities that are required to be remeasured at fair value on a recurring basis:

	February 29, 2016
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	3,808	$	3,808
Total Liabilities	$	—	$	—	$	3,808	$	3,808

	May 31, 2015
	Level 1		Level 2		Level 3		Total
Liabilities:
Contingent consideration	$	—	$	—	$	6,411	$	6,411
Total Liabilities	$	—	$	—	$	6,411	$	6,411

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Segment Disclosure (Tables)

9 Months Ended

Feb. 29, 2016

Segment Reporting [Abstract]

Schedule of consolidated financial information by segment

Selected consolidated financial information by segment for the periods shown was as follows:

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Revenues
Services	$	123,616		$	121,845		$	411,484		$	404,651
International	31,801			33,554			107,085			114,610
Products and Systems	6,866			8,526			23,343			22,588
Corporate and eliminations	(1,928		)	(825		)	(6,918		)	(5,283		)
	$	160,355		$	163,100		$	534,994		$	536,566

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016			February 28, 2015
Gross profit
Services	$	30,256	$	27,429	$	107,943		$	101,452
International	9,227		7,018		32,113			27,795
Products and Systems	3,202		4,211		10,957			10,203
Corporate and eliminations	124		76		(5		)	317
	$	42,809	$	38,734	$	151,008		$	139,767

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Income (loss) from operations
Services	$	10,071		$	7,257		$	44,285		$	36,208
International	1,136			(1,315		)	6,925			1,163
Products and Systems	438			1,346			2,677			1,330
Corporate and eliminations	(5,887		)	(3,418		)	(15,628		)	(12,975		)
	$	5,758		$	3,870		$	38,259		$	25,726

Income (loss) by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations.

	Three months ended						Nine months ended
	February 29, 2016			February 28, 2015			February 29, 2016			February 28, 2015
Depreciation and amortization
Services	$	5,556		$	5,658		$	16,640		$	16,622
International	1,876			1,919			5,762			6,130
Products and Systems	587			608			1,727			1,809
Corporate and eliminations	(88		)	(71		)	(275		)	218
	$	7,931		$	8,114		$	23,854		$	24,779

	February 29, 2016		May 31, 2015
Goodwill
Services	$	119,174	$	117,279
International	34,348		35,938
Products and Systems	13,197		13,197
	$	166,719	$	166,414

	February 29, 2016		May 31, 2015
Total assets
Services	$	300,553	$	301,031
International	122,669		126,643
Products and Systems	32,753		35,464
Corporate and eliminations	7,982		8,589
	$	463,957	$	471,727

Schedule of revenues by geographic area

Revenues by geographic area for the three and nine months ended February 29, 2016 and 2015, respectively, were as follows:

	Three months ended				Nine months ended
	February 29, 2016		February 28, 2015		February 29, 2016		February 28, 2015
Revenues
United States	$	109,518	$	113,664	$	371,929	$	365,912
Other Americas	17,162		14,353		52,248		53,917
Europe	29,706		31,644		100,411		106,370
Asia-Pacific	3,969		3,439		10,406		10,367
	$	160,355	$	163,100	$	534,994	$	536,566

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Description of Business and Basis of Presentation - Immaterial Correction (Details) - USD ($) $ in Thousands	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable	$ (66)	$ (8,037)
Accrued expenses and other liabilities	1,197	(4,594)
Net cash provided by operating activities	55,802	34,516
Acquisition of businesses, net of cash acquired	(1,709)	(34,671)
Net cash used in investing activities	(12,968)	(46,137)
Proceeds from borrowings of long-term debt	2,293	1,145
Repayment of long-term debt	(16,991)	(11,741)
Net borrowings against revolver		37,100
Net cash provided by financing activities	(34,338)	17,067
Effect of exchange rate changes on cash and cash equivalents	$ (956)	(2,081)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable		(7,741)
Accrued expenses and other liabilities		(5,089)
Net cash provided by operating activities		34,317
Acquisition of businesses, net of cash acquired		(34,967)
Net cash used in investing activities		(46,433)
Proceeds from borrowings of long-term debt		0
Repayment of long-term debt		(10,596)
Net borrowings against revolver		35,544
Net cash provided by financing activities		15,511
Effect of exchange rate changes on cash and cash equivalents		$ (30)

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Description of Business and Basis of Presentation - Additional Information (Details) - mo	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016
Principles of Consolidation
Period lag in the consolidation of International segment subsidiaries (months)			1 month
Number of months less than the actual number of months from the acquisition date for which results of international segment subsidiaries are included in consolidation (months)			1
Decrease in effective tax rate (as a percent)	11.00%	8.00%

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Share-Based Compensation - Stock Options (Details) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016 USD ($) shares	Feb. 28, 2015 USD ($)	Feb. 29, 2016 USD ($) plan shares	Feb. 28, 2015 USD ($) shares
Share-based compensation
Number of employee stock ownership plans (plan) | plan			2
Stock Options
Share-based compensation
Recognized share-based compensation expense (less than) | $	$ 0.1	$ 0.1	$ 0.1	$ 0.1
Unrecognized compensation costs, net of estimated forfeitures (less than) | $	$ 0.1		$ 0.1
Weighted-average period over which unrecognized compensation cost is expected to be recognized (years)			1 month
Stock options granted (in shares) | shares			0	0
2007 Plan
Share-based compensation
Number of awards that may be granted (in shares) | shares	0		0

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Share-Based Compensation - Restricted Stock Unit Awards (Details) - Restricted Stock Units shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016 USD ($)	Feb. 28, 2015 USD ($)	Feb. 29, 2016 USD ($) director shares	Feb. 28, 2015 USD ($) director shares
Share-based compensation
Recognized share-based compensation expense (benefit)	$ 1.1	$ 1.2	$ 3.3	$ 3.5
Unrecognized compensation cost, net of estimated forfeitures	$ 8.3		$ 8.3
Weighted-average period over which unrecognized compensation cost is expected to be recognized (years)			2 years 4 months 2 days
Fair value of shares vested			$ 3.5	$ 5.2
Shares vested (in shares) | shares			220	231
Non-employee directors
Share-based compensation
Number of fully vested common stock granted (in shares) | shares			28	21
Number of non-employee directors to whom fully vested common stock is granted (director) | director			5	5
Fair value of shares vested			$ 0.5	$ 0.4

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Share-Based Compensation - Performance Restricted Stock Units (Details) $ in Millions	3 Months Ended						9 Months Ended
	Feb. 29, 2016 USD ($) shares	Nov. 30, 2015 shares	Aug. 31, 2015 shares	Feb. 28, 2015 USD ($)	Nov. 30, 2014	Feb. 28, 2014	Feb. 29, 2016 USD ($) performance_metric shares	Feb. 28, 2015 USD ($)
Performance Shares [Member] | Fiscal 2016 Grants
Share-based compensation
Performance period (years)							1 year
Requisite service period (years)							5 years
Number of performance award metrics | performance_metric							3
Recognized share-based compensation expense (benefit) | $	$ 0.4			$ (0.8)			$ 1.2	$ 0.9
Unrecognized compensation cost | $	$ 3.4						$ 3.4
Weighted-average period over which unrecognized compensation cost is expected to be recognized (years)							3 years 10 months 2 days
Performance Shares [Member] | Fiscal 2016 Grants | Executive and Senior Officers
Share-based compensation
Number of shares granted in period (in shares) | shares	0	80,000	154,000
Nonvested shares outstanding (in shares) | shares	234,000	234,000					234,000
Performance Restricted Stock Units with one year EPS performance condition | Fiscal 2014 Grants
Share-based compensation
Performance period (years)						1 year
Performance Restricted Stock Units with two year EPS performance condition | Fiscal 2014 Grants
Share-based compensation
Performance period (years)						2 years
Performance Restricted Stock Units with three year EPS performance condition | Fiscal 2014 Grants
Share-based compensation
Performance period (years)						3 years
Performance Restricted Stock Units with three year EPS performance condition | Fiscal 2015 Grants
Share-based compensation
Performance period (years)					3 years

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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Basic earnings per share
Net income attributable to Mistras Group, Inc.	$ 3,593	$ 1,817	$ 21,890	$ 13,910
Denominator:
Weighted average common shares outstanding (in shares)	28,906	28,656	28,832	28,583
Basic earnings per share (in dollars per share)	$ 0.12	$ 0.06	$ 0.76	$ 0.49
Denominator:
Weighted average common shares outstanding (in shares)	28,906	28,656	28,832	28,583
Dilutive effect of stock options outstanding (in shares)	739	694	657	742
Dilutive effect of restricted stock units outstanding (in shares)	254	179	271	234
Weighted average common shares outstanding, diluted (in shares)	29,899	29,529	29,760	29,559
Diluted earnings per share (in dollars per share)	$ 0.12	$ 0.06	$ 0.74	$ 0.47

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Acquisitions - Narrative (Details)	9 Months Ended
	Feb. 29, 2016 USD ($) Entity	Feb. 28, 2015 USD ($) Entity	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)
Acquisitions
Fair value of contingent consideration liabilities (less than)	$ 3,800,000		$ 6,400,000
Period over which potential acquisition-related contingent consideration would be payable	3 years 4 months
Goodwill	$ 166,719,000		$ 166,414,000	$ 130,516,000
Fiscal 2015 Acquisitions
Acquisitions
Number of Entities | Entity		4
Percentage of common stock acquired		100.00%
Cash paid		$ 35,700,000
Notes payable issued as part of acquisition		20,500,000
Goodwill		$ 45,200,000
Fiscal 2015 Acquisitions | Minimum
Acquisitions
Amortization period of intangible assets acquired		3 years
Fiscal 2015 Acquisitions | Maximum
Acquisitions
Amortization period of intangible assets acquired		10 years
United States | Fiscal 2016 Acquisitions
Acquisitions
Number of Entities | Entity	1
Percentage of common stock acquired	100.00%
Cash paid	$ 1,750,000
Fair value of contingent consideration liabilities (less than)	945,000
Goodwill	$ 2,658,000
Quebec and Florida | Fiscal 2015 Acquisitions
Acquisitions
Fair value of contingent consideration liabilities (less than)		$ 3,200,000.0
Quebec and Florida | Fiscal 2015 Acquisitions | Minimum
Acquisitions
Period over which potential acquisition-related contingent consideration would be payable		2 years
Quebec and Florida | Fiscal 2015 Acquisitions | Maximum
Acquisitions
Period over which potential acquisition-related contingent consideration would be payable		3 years

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Acquisitions - Preliminary Purchase Price Allocation (Details) $ in Thousands	9 Months Ended
	Feb. 29, 2016 USD ($) Entity	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)
Acquisitions
Contingent consideration	$ 3,800	$ 6,400
Goodwill	$ 166,719	$ 166,414	$ 130,516
United States | Fiscal 2016 Acquisitions
Acquisitions
Number of Entities | Entity	1
Cash paid	$ 1,750
Contingent consideration	945
Consideration transferred	2,695
Current assets	145
Property, plant and equipment	485
Goodwill	2,658
Current liabilities	(521)
Long-term deferred tax liability	(72)
Net assets acquired	$ 2,695

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Acquisitions - Acquisition-Related Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015	May. 31, 2015
Acquisitions
Decrease of acquisition-related contingent consideration liabilities			$ (1,292)	$ (3,266)
Acquisition related costs	$ 100	$ 200	200	200
Contingent consideration	3,800		3,800		$ 6,400
Fiscal 2016 Acquisitions
Acquisitions
Decrease of acquisition-related contingent consideration liabilities	$ 200		$ 1,300
Fiscal 2015 Acquisitions
Acquisitions
Decrease of acquisition-related contingent consideration liabilities		$ 1,700		$ 3,300

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Accounts Receivable, net (Details) - USD ($) $ in Thousands	Feb. 29, 2016	May. 31, 2015
Receivables [Abstract]
Trade accounts receivable	$ 132,340	$ 136,208
Allowance for doubtful accounts	(3,735)	(2,980)
Accounts receivable, net	$ 128,605	$ 133,228

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Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015	May. 31, 2015
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 195,285		$ 195,285		$ 190,264
Accumulated depreciation and amortization	(119,620)		(119,620)		(111,008)
Property, plant and equipment, net	75,665		75,665		79,256
Depreciation expense	5,500	$ 5,400	16,700	$ 16,300
Land
Property, Plant and Equipment, net
Property, plant and equipment, gross	1,719		1,719		1,856
Buildings and improvements
Property, Plant and Equipment, net
Property, plant and equipment, gross	18,534		$ 18,534		17,712
Buildings and improvements | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			30 years
Buildings and improvements | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			40 years
Office furniture and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	8,653		$ 8,653		8,084
Office furniture and equipment | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			5 years
Office furniture and equipment | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			8 years
Machinery and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 166,379		$ 166,379		$ 162,612
Machinery and equipment | Minimum
Property, Plant and Equipment, net
Useful Life (Years)			5 years
Machinery and equipment | Maximum
Property, Plant and Equipment, net
Useful Life (Years)			7 years

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Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Feb. 29, 2016	May. 31, 2015	May. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 166,414	$ 130,516
Goodwill acquired (disposed) during the year	2,284	43,466
Adjustments to preliminary purchase price allocations	271	3,162
Foreign currency translation	(2,250)	(10,730)
Goodwill, ending balance	166,719	166,414
Services
Goodwill [Roll Forward]
Goodwill, beginning balance	117,279	73,767
Goodwill acquired (disposed) during the year	2,658	41,986
Adjustments to preliminary purchase price allocations	271	3,529
Foreign currency translation	(1,034)	(2,003)
Goodwill, ending balance	119,174	117,279
International
Goodwill [Line Items]
Goodwill, cumulative impairment loss	9,900	9,900	$ 9,900
Goodwill [Roll Forward]
Goodwill, beginning balance	35,938	43,552
Goodwill acquired (disposed) during the year	(374)	1,480
Adjustments to preliminary purchase price allocations	0	(367)
Foreign currency translation	(1,216)	(8,727)
Goodwill, ending balance	34,348	35,938
Products and Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	13,197	13,197
Goodwill acquired (disposed) during the year	0	0
Adjustments to preliminary purchase price allocations	0	0
Foreign currency translation	0	0
Goodwill, ending balance	$ 13,197	$ 13,197

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Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015	May. 31, 2015
Intangible assets
Gross Amount	$ 115,070		$ 115,070		$ 115,427
Accumulated Amortization	(70,739)		(70,739)		(64,151)
Net Carrying Amount	44,331		44,331		51,276
Amortization expense	2,400	$ 2,700	7,200	$ 8,500
Customer relationships
Intangible assets
Gross Amount	79,577		79,577		81,101
Accumulated Amortization	(45,469)		(45,469)		(41,009)
Net Carrying Amount	34,108		$ 34,108		40,092
Customer relationships | Minimum
Intangible assets
Useful Life (Years)			5 years
Customer relationships | Maximum
Intangible assets
Useful Life (Years)			12 years
Software/Technology
Intangible assets
Gross Amount	17,055		$ 17,055		15,738
Accumulated Amortization	(11,377)		(11,377)		(10,290)
Net Carrying Amount	5,678		$ 5,678		5,448
Software/Technology | Minimum
Intangible assets
Useful Life (Years)			3 years
Software/Technology | Maximum
Intangible assets
Useful Life (Years)			15 years
Covenants not to compete
Intangible assets
Gross Amount	11,618		$ 11,618		11,678
Accumulated Amortization	(9,102)		(9,102)		(8,605)
Net Carrying Amount	2,516		$ 2,516		3,073
Covenants not to compete | Minimum
Intangible assets
Useful Life (Years)			2 years
Covenants not to compete | Maximum
Intangible assets
Useful Life (Years)			5 years
Other
Intangible assets
Gross Amount	6,820		$ 6,820		6,910
Accumulated Amortization	(4,791)		(4,791)		(4,247)
Net Carrying Amount	$ 2,029		$ 2,029		$ 2,663
Other | Minimum
Intangible assets
Useful Life (Years)			2 years
Other | Maximum
Intangible assets
Useful Life (Years)			5 years

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Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Feb. 29, 2016	May. 31, 2015
Payables and Accruals [Abstract]
Accrued salaries, wages and related employee benefits	$ 27,274	$ 26,053
Contingent consideration, current portion	1,508	3,543
Accrued workers’ compensation and health benefits	5,933	3,630
Deferred revenue	4,302	3,841
Other accrued expenses	14,167	18,847
Total accrued expenses and other liabilities	$ 53,184	$ 55,914

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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Feb. 29, 2016	May. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 87,366	$ 113,459
Less: Current portion	(12,488)	(17,902)
Long-term debt, net of current portion	74,878	95,557
Senior credit facility
Debt Instrument [Line Items]
Long-term debt	71,528	83,062
Notes payable
Debt Instrument [Line Items]
Long-term debt	10,368	24,933
Other
Debt Instrument [Line Items]
Long-term debt	$ 5,470	$ 5,464

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Long-Term Debt - Additional Information (Details)		9 Months Ended
	Oct. 31, 2014 USD ($) Quarter	Feb. 29, 2016 USD ($)
Senior credit facility
Senior Credit Facility
Maximum borrowing capacity	$ 175,000,000
Line of credit facility, higher borrowing capacity option	225,000,000
Maximum borrowing capacity in non-U.S. Dollar currencies	30,000,000.0
Maximum amount available for the issuance of letters of credit	$ 10,000,000.0
Outstanding borrowings		$ 71,500,000
Outstanding letters of credit		$ 4,500,000
Number of consecutive fiscal quarters used for calculating Funded Debt Leverage Ratio | Quarter	4
Funded Debt Leverage Ratio at which the entity will have the benefit of lowest interest margin (less than or equal to)	0.5
Funded Debt Leverage Ratio at which the entity will bear the maximum interest rate margin (greater than)	2.0
Additional interest rate margin if Funded Debt Leverage Ratio exceeds threshold (as a percent)	2.00%
Funded Debt Leverage Ratio for additional interest payment (less than)	3.25
Interest Coverage Ratio (greater than)	3.0
Preceding period used for calculating Interest Coverage Ratio	12 months
Senior credit facility | LIBOR
Senior Credit Facility
Reference rate, description	LIBOR
Senior credit facility | LIBOR | Minimum
Senior Credit Facility
Margin (as a percent)	1.00%
Senior credit facility | LIBOR | Maximum
Senior Credit Facility
Margin (as a percent)	1.75%
Senior credit facility | Base rate
Senior Credit Facility
Reference rate, description	base rate
Senior credit facility | Base rate | Minimum
Senior Credit Facility
Margin (as a percent)	(0.375%)
Senior credit facility | Base rate | Maximum
Senior Credit Facility
Margin (as a percent)	(1.25%)
Notes payable
Notes Payable and Other
Interest rate, minimum (as a percent)		0.00%
Interest rate, maximum (as a percent)		4.00%
Notes payable | Minimum
Notes Payable and Other
Maturity term from the date of acquisition		2 years
Market interest rate (as a percent)		2.00%
Notes payable | Maximum
Notes Payable and Other
Maturity term from the date of acquisition		5 years
Market interest rate (as a percent)		4.00%

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Feb. 29, 2016	May. 31, 2015
Liabilities:
Contingent consideration	$ 3,800	$ 6,400
Recurring basis
Liabilities:
Contingent consideration	3,808	6,411
Total Liabilities	3,808	6,411
Recurring basis | Level 1
Liabilities:
Contingent consideration	0	0
Total Liabilities	0	0
Recurring basis | Level 2
Liabilities:
Contingent consideration	0	0
Total Liabilities	0	0
Recurring basis | Level 3
Liabilities:
Contingent consideration	3,808	6,411
Total Liabilities	$ 3,808	$ 6,411

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Commitments and Contingencies (Details)	1 Months Ended	9 Months Ended
	Apr. 30, 2015 claim	Feb. 29, 2016 USD ($) claim
Litigation
Period over which potential acquisition-related contingent consideration would be payable		3 years 4 months
Uninsured risk
Litigation
Number of claims filed | claim	2
Lawsuits for alleged quality defects
Litigation
Number of claims filed | claim		0
Acquisition-related contingencies
Litigation
Potential acquisition-related contingent consideration, low end of range | $		$ 0
Potential acquisition-related contingent consideration, high end of range | $		$ 17,800,000

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Segment Disclosure - Financial Information by Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016 USD ($)	Feb. 28, 2015 USD ($)	Feb. 29, 2016 USD ($) segment	Feb. 28, 2015 USD ($)	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			3
Financial information by segment
Revenues	$ 160,355	$ 163,100	$ 534,994	$ 536,566
Gross profit	42,809	38,734	151,008	139,767
Income (loss) from operations	5,758	3,870	38,259	25,726
Depreciation and amortization	7,931	8,114	23,854	24,779
Goodwill	166,719		166,719		$ 166,414	$ 130,516
Total assets	463,957		463,957		471,727
Corporate and eliminations
Financial information by segment
Revenues	(1,928)	(825)	(6,918)	(5,283)
Gross profit	124	76	(5)	317
Income (loss) from operations	(5,887)	(3,418)	(15,628)	(12,975)
Depreciation and amortization	(88)	(71)	(275)	218
Total assets	7,982		7,982		8,589
Services
Financial information by segment
Goodwill	119,174		119,174		117,279	73,767
Services | Operating segments
Financial information by segment
Revenues	123,616	121,845	411,484	404,651
Gross profit	30,256	27,429	107,943	101,452
Income (loss) from operations	10,071	7,257	44,285	36,208
Depreciation and amortization	5,556	5,658	16,640	16,622
Goodwill	119,174		119,174		117,279
Total assets	300,553		300,553		301,031
International
Financial information by segment
Goodwill	34,348		34,348		35,938	43,552
International | Operating segments
Financial information by segment
Revenues	31,801	33,554	107,085	114,610
Gross profit	9,227	7,018	32,113	27,795
Income (loss) from operations	1,136	(1,315)	6,925	1,163
Depreciation and amortization	1,876	1,919	5,762	6,130
Goodwill	34,348		34,348		35,938
Total assets	122,669		122,669		126,643
Products and Systems
Financial information by segment
Goodwill	13,197		13,197		13,197	$ 13,197
Products and Systems | Operating segments
Financial information by segment
Revenues	6,866	8,526	23,343	22,588
Gross profit	3,202	4,211	10,957	10,203
Income (loss) from operations	438	1,346	2,677	1,330
Depreciation and amortization	587	$ 608	1,727	$ 1,809
Goodwill	13,197		13,197		13,197
Total assets	$ 32,753		$ 32,753		$ 35,464

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Segment Disclosure - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Revenue and long-lived assets by geographic area
Revenues	$ 160,355	$ 163,100	$ 534,994	$ 536,566
United States
Revenue and long-lived assets by geographic area
Revenues	109,518	113,664	371,929	365,912
Other Americas
Revenue and long-lived assets by geographic area
Revenues	17,162	14,353	52,248	53,917
Europe
Revenue and long-lived assets by geographic area
Revenues	29,706	31,644	100,411	106,370
Asia-Pacific
Revenue and long-lived assets by geographic area
Revenues	$ 3,969	$ 3,439	$ 10,406	$ 10,367