Exhibit 99

MATRIX SERVICE ANNOUNCES RESULTS FOR THE FOURTH QUARTER AND FISCAL

YEAR ENDED JUNE 30, 2011

TULSA, OK – September 7, 2011 – Matrix Service Company (Nasdaq: MTRX) today reported its financial results for the fourth quarter and fiscal year ended June 30, 2011.

Fourth Quarter of Fiscal 2011 Results

Revenues for the fourth quarter ended June 30, 2011 were $163.6 million compared to $140.7 million in the same period a year earlier. Net income for the fourth quarter of fiscal 2011 was $5.7 million, or $0.21 per fully diluted share. The Company recognized a net loss in the fourth quarter of fiscal 2010 of $4.2 million, or ($0.16) per fully diluted share. The fiscal 2010 fourth quarter results included non-routine charges totaling $3.5 million, or ($0.08) per fully diluted share and a loss on a series of projects at a customer site totaling $4.6 million, or ($0.11) per fully diluted share.

John R. Hewitt, President and CEO of Matrix Service Company, said “We are very pleased with the overall performance this year. Even with a struggling national economy our employees have done a great job winning and executing projects in our core businesses. Matrix Service is well positioned to take advantage of continued opportunities in the energy market.”

Consolidated gross profit was $20.9 million in the fourth quarter of fiscal 2011 compared to $3.8 million in the same period a year earlier. The prior year gross profit included a non-routine charge of $3.1 million and a loss on a series of projects at a customer site totaling $4.6 million. Gross margins were 12.8% in the fourth quarter of fiscal 2011 compared to 2.7% in the same period a year earlier. The improvement in the fourth quarter of fiscal 2011 was due to better project execution, the favorable effect of improved recovery of construction overhead costs in the fourth quarter of fiscal 2011 and the effect of the charges mentioned above on the fourth quarter of fiscal 2010 results. Selling, general and administrative expenses were $11.4 million, or 6.9% of revenue, in fiscal 2011 compared to $10.5 million, or 7.4% of revenue, in the same period a year earlier. The increase in selling, general and administrative expenses is primarily attributable to higher incentive compensation costs due to improved operating results compared to the same period a year earlier.

Fiscal 2011 Results

Fiscal year 2011 revenues were $627.1 million compared to $550.8 million in fiscal 2010. Net income for fiscal 2011 was $19.0 million, or $0.71 per fully diluted share. Net income for fiscal 2010 was $4.9 million, or $0.18 per fully diluted share. The fiscal 2010 results included non-routine charges totaling $10.0 million, or ($0.23) per fully diluted share and a loss on a series of projects at a customer site totaling $5.4 million, or ($0.13) per fully diluted share.

Consolidated gross profit was $74.9 million in fiscal 2011 compared to $52.9 million in the same period a year earlier. The prior year gross profit included a non-routine charge of $5.1 million and a loss on a series of projects at a customer site totaling $5.4 million. Gross margins were 11.9% in fiscal 2011 compared to 9.6% in fiscal 2010. The improvement in fiscal 2011 was due to the favorable effect of improved recovery of construction overhead costs in fiscal 2011 as well as the effect of the charges mentioned above on fiscal 2010 results. Selling, general and administrative expenses were $44.0 million, or 7.0% of revenues, in fiscal 2011 compared to $45.2 million, or 8.2% of revenue, in the same period a year earlier. Fiscal 2010 selling, general and administrative expenses included non-routine charges

totaling $4.8 million. The decrease in selling, general and administrative expenses was due to the effect of the charges mentioned above on fiscal 2010 results largely offset by higher legal and facility costs in fiscal 2011 as well as higher incentive compensation expense due to improved operating results.

Backlog

Consolidated backlog at June 30, 2011 totaled $405.1 million, an increase of $21.2 million, or 5.5%, compared to the backlog at March 31, 2011, and an increase of $51.9 million, or 14.7%, compared to the backlog at June 30, 2010.

Financial Position

At June 30, 2011, Matrix Service’s cash balance was $59.4 million. The Company did not borrow under its revolving credit facility during the twelve months ended June 30, 2011.

Earnings Guidance

The Company expects that fiscal 2012 revenues will be between $650 million and $725 million and earnings to be between $0.75 and $0.95 per fully diluted share.

Conference Call Details

In conjunction with the press release, Matrix Service will host a conference call with John R. Hewitt, President and CEO, and Kevin S. Cavanah, Vice President and CFO. The call will take place at 11:00 a.m. (Eastern) / 10:00 a.m. (Central) on Thursday, September 8, 2011 and will be simultaneously broadcast live over the Internet which can be accessed at the Company’s website at www.matrixservice.com on the Investors’ page under Conference Calls/Events. Please allow extra time prior to the call to visit the site and download the streaming media software required to listen to the Internet broadcast. The conference call will be recorded and will be available for replay within one hour of completion of the live call and can be accessed following the same link as the live call.

About Matrix Service Company

Matrix Service Company provides engineering, construction and repair and maintenance services principally to the petroleum, power, bulk storage terminal, pipeline and industrial gas industries.

The Company is headquartered in Tulsa, Oklahoma, with regional operating facilities throughout the United States and Canada.

This release contains forward-looking statements that are made in reliance upon the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements are generally accompanied by words such as “anticipate,” “continues,” “expect,” “forecast,” “outlook,” “believe,” “estimate,” “should” and “will” and words of similar effect that convey future meaning, concerning the Company’s operations, economic performance and management’s best judgment as to what may occur in the future. Future events involve risks and uncertainties that may cause actual results to differ materially from those we currently anticipate. The actual results for the current and future periods and other corporate developments will depend upon a number of economic, competitive and other influences, including those factors discussed in the “Risk Factors” and “Forward Looking Statements” sections and elsewhere in the Company’s reports and filings made from time to time with the Securities and Exchange Commission. Many of these risks and uncertainties are beyond the control of the Company, and any one of which, or a combination of which, could materially and adversely affect the results of the Company’s operations and its financial condition. We undertake no obligation to update information contained in this release.

For more information, please contact:

Matrix Service Company

Kevin S. Cavanah

Vice President and CFO

T: 918-838-8822

E: kcavanah@matrixservice.com

Matrix Service Company

Consolidated Statements of Income

(In thousands, except per share data)

	Three Months Ended						Twelve Months Ended
	June 30, 2011			June 30, 2010			June 30, 2011			June 30, 2010
Revenues	$	163,629		$	140,726		$	627,052		$	550,814
Cost of revenues		142,755			136,957			552,138			497,892
Gross profit		20,874			3,769			74,914			52,922
Selling, general and administrative expenses		11,359			10,458			44,014			45,169
Operating income (loss)		9,515			(6,689	)		30,900			7,753
Other income (expense):
Interest expense		(201	)		(147	)		(795	)		(672	)
Interest income		6			9			71			79
Other		(155	)		(502	)		440			250
Income (loss) before income tax expense		9,165			(7,329	)		30,616			7,410
Provision (benefit) for federal, state and foreign income taxes		3,482			(3,100	)		11,634			2,534
Net income (loss)	$	5,683		$	(4,229	)	$	18,982		$	4,876
Basic earnings (loss) per common share	$	0.21		$	(0.16	)	$	0.72		$	0.19
Diluted earnings (loss) per common share	$	0.21		$	(0.16	)	$	0.71		$	0.18
Weighted average common shares outstanding:
Basic		26,457			26,324			26,406			26,275
Diluted		26,797			26,549			26,686			26,499

Matrix Service Company

Consolidated Balance Sheets

(In thousands)

	June 30, 2011			June 30, 2010
Assets
Current assets:
Cash and cash equivalents	$	59,357		$	50,899
Accounts receivable, less allowances (2011 - $1,428; 2010 - $1,404)		103,483			87,327
Costs and estimated earnings in excess of billings on uncompleted contracts		40,056			40,920
Inventories		2,249			3,451
Income tax receivable		399			1,779
Deferred income taxes		5,607			8,073
Other current assets		4,399			6,076
Total current assets		215,550			198,525
Property, plant and equipment, at cost:
Land and buildings		28,287			27,859
Construction equipment		55,272			52,086
Transportation equipment		21,690			19,192
Furniture and fixtures		15,442			14,358
Construction in progress		2,465			1,251
		123,156			114,746
Accumulated depreciation		(69,845	)		(61,817	)
		53,311			52,929
Goodwill		29,058			27,216
Other intangible assets		6,953			4,141
Other assets		1,564			1,997
Total assets	$	306,436		$	284,808

Matrix Service Company

Consolidated Balance Sheets (continued)

(In thousands, except share data)

	June 30, 2011			June 30, 2010
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable	$	36,377		$	44,769
Billings on uncompleted contracts in excess of costs and estimated earnings		35,485			28,877
Accrued insurance		7,514			8,257
Accrued wages and benefits		18,099			13,538
Current capital lease obligation		262			772
Other accrued expenses		2,401			6,572
Total current liabilities		100,138			102,785
Long-term capital lease obligation		38			259
Deferred income taxes		5,789			4,179
Acquisition payable		800			—
Commitments and contingencies		—			—
Stockholders’ equity:
Common stock - $.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of June 30, 2011 and June 30, 2010		279			279
Additional paid-in capital		113,686			111,637
Retained earnings		100,231			81,252
Accumulated other comprehensive income		1,436			495
		215,632			193,663
Less treasury stock, at cost - 1,417,539 and 1,546,512 shares as of June 30, 2011 and June 30, 2010		(15,961	)		(16,078	)
Total stockholders’ equity		199,671			177,585
Total liabilities and stockholders’ equity	$	306,436		$	284,808

Results of Operations

(In thousands)

	Construction Services			Repair and Maintenance Services			Other		Total
Three Months Ended June 30, 2011
Gross revenues	$	90,379		$	78,120		$	—	$	168,499
Less: Inter-segment revenues		4,682			188			—		4,870
Consolidated revenues		85,697			77,932			—		163,629
Gross profit		12,133			8,741			—		20,874
Operating income		5,550			3,965			—		9,515
Segment assets		137,542			102,244			66,650		306,436
Capital expenditures		1,491			640			717		2,848
Depreciation and amortization expense		1,655			1,162			—		2,817
Three Months Ended June 30, 2010
Gross revenues	$	89,453		$	54,048		$	—	$	143,501
Less: Inter-segment revenues		2,773			2			—		2,775
Consolidated revenues		86,680			54,046			—		140,726
Gross profit		1,287			2,483			—		3,770
Operating income (loss)		(5,195	)		(1,494	)		—		(6,689	)
Segment assets		131,079			93,224			60,505		284,808
Capital expenditures		60			151			1,032		1,243
Depreciation and amortization expense		1,602			1,269			—		2,871
Twelve Months Ended June 30, 2011
Gross revenues	$	375,682		$	263,329		$	—	$	639,011
Less: Inter-segment revenues		11,184			775			—		11,959
Consolidated revenues		364,498			262,554			—		627,052
Gross profit		49,484			25,430			—		74,914
Operating income		23,359			7,541			—		30,900
Segment assets		137,542			102,244			66,650		306,436
Capital expenditures		5,949			1,533			2,934		10,416
Depreciation and amortization expense		6,267			4,800			—		11,067
Twelve Months Ended June 30, 2010
Gross revenues	$	333,937		$	229,774		$	—	$	563,711
Less: Inter-segment revenues		12,683			214			—		12,897
Consolidated revenues		321,254			229,560			—		550,814
Gross profit		34,374			18,548			—		52,922
Operating income		5,957			1,796			—		7,753
Segment assets		131,079			93,224			60,505		284,808
Capital expenditures		625			1,233			3,444		5,302
Depreciation and amortization expense		6,578			5,173			—		11,751

Segment Revenue from External Customers by Industry Type

(In thousands)

	Construction Services		Repair and Maintenance Services		Total
Three Months Ended June 30, 2011
Aboveground Storage Tanks	$	52,681	$	20,351	$	73,032
Downstream Petroleum		12,923		39,010		51,933
Electrical and Instrumentation		12,931		18,571		31,502
Specialty		7,162		—		7,162
Total	$	85,697	$	77,932	$	163,629
Three Months Ended June 30, 2010
Aboveground Storage Tanks	$	40,147	$	21,261	$	61,408
Downstream Petroleum		17,753		25,683		43,436
Electrical and Instrumentation		24,273		7,102		31,375
Specialty		4,507		—		4,507
Total	$	86,680	$	54,046	$	140,726
Twelve Months Ended June 30, 2011
Aboveground Storage Tanks	$	183,125	$	81,117	$	264,242
Downstream Petroleum		70,473		115,267		185,740
Electrical and Instrumentation		84,731		66,170		150,901
Specialty		26,169		—		26,169
Total	$	364,498	$	262,554	$	627,052
Twelve Months Ended June 30, 2010
Aboveground Storage Tanks	$	135,883	$	91,085	$	226,968
Downstream Petroleum		87,003		114,976		201,979
Electrical and Instrumentation		71,999		23,499		95,498
Specialty		26,369		—		26,369
Total	$	321,254	$	229,560	$	550,814

Backlog

We define backlog as the total dollar amount of revenues that we expect to recognize as a result of performing work that has been awarded to us through a signed contract that we consider firm. The following contract types are considered firm:

• fixed-price arrangements;

• minimum customer commitments on cost plus arrangements; and

• certain time and material contracts in which the estimated contract value is firm or can be estimated with a reasonable amount of certainty in both timing and amounts.

For long-term maintenance contracts we include only the amounts that we expect to recognize into revenue over the next 12 months. For all other arrangements, we calculate backlog as the estimated contract amount less revenues recognized as of the reporting date.

The following table provides a summary of changes in our backlog for the three months ended June 30, 2011:

	Construction Services			Repair and Maintenance Services			Total
	(In thousands)
Backlog as of March 31, 2011	$	207,494		$	176,388		$	383,882
New backlog awarded		103,936			80,929			184,865
Revenue recognized on contracts in backlog		(85,697	)		(77,932	)		(163,629	)
Backlog as of June 30, 2011	$	225,733		$	179,385		$	405,118

The following table provides a summary of changes in our backlog for the twelve months ended June 30, 2011:

	Construction Services			Repair and Maintenance Services			Total
	(In thousands)
Backlog as of June 30, 2010	$	197,675		$	155,541		$	353,216
New backlog awarded		392,556			286,398			678,954
Revenue recognized on contracts in backlog		(364,498	)		(262,554	)		(627,052	)
Backlog as of June 30, 2011	$	225,733		$	179,385		$	405,118