Exhibit 99.1

FOR IMMEDIATE RELEASE

O’REILLY AUTOMOTIVE, INC., REPORTS SECOND QUARTER 2010 RESULTS

• Consolidated Comparable Store Sales increase of 7.9%

• Adjusted operating margin improves to 14.2%

• Adjusted diluted earnings per share increases 31% to $0.81

Springfield, MO, July 28, 2010 — O’Reilly Automotive, Inc. (“O’Reilly” or “the Company”) (Nasdaq: ORLY) today announced record revenues and earnings for the second quarter ended June 30, 2010.

2^nd Quarter Financial Results

Sales for the second quarter ended June 30, 2010, totaled $1.38 billion, up 10% from $1.25 billion for the same period a year ago. Gross profit for the second quarter ended June 30, 2010, increased to $673 million (or 48.7% of sales) from $604 million (or 48.2% of sales) for the second quarter of 2009, representing an increase of 11%. Selling, General and Administrative (“SG&A”) expenses increased to $476 million (or 34.5% of sales) for the second quarter of 2010 from $454 million (or 36.3% of sales) for the second quarter of 2009, representing an increase of 5%. Operating income increased to $181 million (or 13.1% of sales) for the second quarter of 2010 from $150 million (or 12.0% of sales), representing an increase of 21%.

Net income for the second quarter ended June 30, 2010, totaled $100 million, up 16% from $86 million for the same period in 2009. Diluted earnings per common share for the second quarter of 2010 increased 15% to $0.71 on 141.1 million shares compared to $0.62 for the second quarter of 2009 on 137.5 million shares.

The Company’s second quarter and year-to-date results include a charge related to the ongoing, legacy United States Department of Justice (“DOJ”) investigation of CSK Auto Corporation (“CSK”). As previously announced, prior to O’Reilly’s acquisition of CSK in July of 2008, the DOJ began an investigation of CSK relating to CSK’s historical accounting practices. The charge of $15 million in the second quarter of 2010 represents an increase in the accrual for the estimated costs to resolve the DOJ investigation, including potential settlement-related payments to the DOJ, future costs of cooperation with the DOJ, and associated legal and documentation costs; however, there can be no assurance that the discussions with the DOJ will result in a resolution of these matters within the amount currently accrued by O’Reilly.

Adjusted operating income, excluding the impact of the charge related to the CSK DOJ investigation discussed above, increased 31% to $196 million (or 14.2% of sales) for the second quarter ended June 30, 2010, from $150 million (or 12.0% of sales) for the same period a year ago. Adjusted diluted earnings per common share, excluding the impact of the charge related to the CSK DOJ investigation discussed above, increased 31% to $0.81 for the second quarter ended June 30, 2010, from $0.62 for the same period one year ago. The table below outlines the impact of the charge for the second quarter ended June 30, 2010 (in thousands, except per share data):

	For the Three Months  Ended June 30,
	2010		2009
Operating income	$	181,164	$	149,675
Accrual of legacy CSK DOJ investigation charge		15,000		—
Adjusted operating income	$	196,164	$	149,675
Net income	$	99,595	$	85,515
Accrual of legacy CSK DOJ investigation charge		15,000		—
Adjusted net income	$	114,595	$	85,515
Diluted earnings per common share	$	0.71	$	0.62
Accrual of legacy CSK DOJ investigation charge		0.10		—
Adjusted diluted earnings per common share	$	0.81	$	0.62

“We are pleased with our ability to continue to drive both comparable store sales and profitability above the solid performance in the second quarter of 2009,” commented Greg Henslee, CEO and Co-President. “The outstanding execution of our team in the second quarter resulted in a comparable store sales growth of 7.9%, a 220 basis point improvement in adjusted operating margin and a double-digit increase in adjusted diluted earnings per share of 31%. July 11th marked the two-year anniversary of the CSK acquisition and Team O’Reilly’s unwavering commitment to the execution of our integration plan has been a key driver of our success to date. Throughout the integration process, our Team Members have remained dedicated to living our Culture of customer service and teamwork in both our existing as well as converted stores.”

Year-to-Date Financial Results

Sales for the first six months of 2010 totaled $2.66 billion, up 10% from $2.42 billion for the same period a year ago. Gross profit for the first six months of 2010 increased to $1.29 billion (or 48.5% of sales) from $1.15 billion (or 47.5% of sales) for the same period a year ago, representing an increase of 13%. SG&A expenses increased to $926 million (or 34.8% of sales) for the first six months of 2010 from $883 million (or 36.6% of sales) for the same period a year ago, representing an increase of 5%. Operating income for the first six months of 2010 increased to $350 million (or 13.1% of sales) from $263 million (or 10.9% of sales) for the same period a year ago, representing an increase of 33%.

Net income for the first six months of 2010 totaled $197 million, up 33% from $148 million for the same period a year ago. Diluted earnings per common share for the first six months of 2010 increased 30% to $1.40 on 140.4 million shares compared to $1.08 for the same period a year ago on 136.8 million shares.

Adjusted operating income, excluding the impact of the charge related to the CSK DOJ investigation discussed above, increased 39% to $365 million (or 13.7% of sales) for the first six months of 2010, from $263 million (or 10.9% of sales) for the same period a year ago. Adjusted diluted earnings per common share, excluding the impact of the charge related to the CSK DOJ investigation discussed above, increased 40% to $1.51 for the first six months of 2010, from $1.08 for the same period one year ago. The table below outlines the impact of the charge for the six months ended June 30, 2010 (in thousands, except per share data):

	For the Six Months  Ended June 30,
	2010		2009
Operating income	$	349,609	$	263,011
Accrual of legacy CSK DOJ investigation charge		15,000		—
Adjusted operating income	$	364,609	$	263,011
Net income	$	197,071	$	148,350
Accrual of legacy CSK DOJ investigation charge		15,000		—
Adjusted net income	$	212,071	$	148,350
Diluted earnings per common share	$	1.40	$	1.08
Accrual of legacy CSK DOJ investigation charge		0.11		—
Adjusted diluted earnings per common share	$	1.51	$	1.08

“During the first half of 2010, we delivered solid top-line growth, improved profitability and achieved record earnings,” added Mr. Henslee. “The consistency and strength of our results truly emphasize the power of our proven dual market strategy and the tremendous talent we possess throughout our Company. We remained focused on gaining market share by continuing to provide the highest level of parts availability and service in the industry, while relentlessly controlling costs. We are encouraged by the solid performance in the first half of 2010, and we look forward to sustaining our momentum and building upon our successes for the remainder of the year.”

2^nd Quarter and Year-to-Date Comparable Store Sales Results

Comparable store sales are calculated based on the change in sales for stores open at least one year and exclude sales of specialty machinery, sales to independent parts stores, sales to team members and sales during the one to two week period certain CSK branded stores were closed for conversion. Consolidated comparable store sales for stores open at least one year increased 7.9% for the second quarter of 2010 versus 4.8% for the second quarter of 2009. Consolidated comparable store sales for stores open at least one year increased 7.4% for the first six months of 2010 versus 5.2% for the first six months of 2009.

Ted Wise, COO and Co-President commented on the Company’s second quarter results. “The CSK system conversion process continued on schedule in the second quarter with the successful opening of our DC in Salt Lake City, Utah, and the conversion of 102 CSK stores to the O’Reilly systems. In addition to the CSK conversion activities, we opened 24 stores in the second quarter, which brings our total to 73 new stores for the first half of this year. As previously announced, we continue to expect to open a total of 150 new stores in 2010. We are on track to relocate our Dixon, California, DC to Stockton, California, in September, which will allow for the conversion of an additional 274 CSK stores. With the planned conversion of our final DC in Phoenix, Arizona, to the O’Reilly systems in November, we will convert the remaining 151 CSK stores to the O’Reilly systems by the end of 2010.”

Mr. Wise added, “We are excited by the company’s growth, and are anxious to see the completion of the CSK integration process in 2011. Our performance in the first half of this year would not have been possible without the efforts of our 46,000 Team Members and our continued success is a testament to their dedication and hard work.”

3^rd Quarter and Updated Full Year 2010 Guidance

The Company estimates diluted earnings per common share for the third quarter of 2010 to range from $0.69 to $0.73 and estimates diluted earnings per common share for the year ended December 31, 2010, to range from $2.64 to $2.74. Adjusted diluted earnings per common share, which excludes the impact of the charge related to the CSK DOJ investigation of $0.11 per diluted share, is expected to range from $2.75 to $2.85 for the year ended December 31, 2010.

The Company estimates consolidated comparable store sales for the third quarter of 2010 to range from 4.0% to 6.0%. The Company estimates consolidated comparable store sales for the year ended December 31, 2010, to range from 5.0% to 7.0%.

Non-GAAP Information

This release contains certain financial information not derived in accordance with United States generally accepted accounting principles (“GAAP”). The Company does not, and nor does it suggest investors should, consider such non-GAAP financial measures in isolation from, or as a substitute for, GAAP financial information. The Company believes that the presentation of financial results and estimates excluding the impact of the CSK DOJ investigation charge provides meaningful supplemental information to both management and investors that is indicative of the Company’s core operations. The Company excludes this item in judging its performance and believes this non-GAAP information is useful to investors as well. The Company has included a reconciliation of this additional information to the most comparable GAAP measures in the accompanying reconciliation table.

Conference Call

The Company will host a conference call July 29, 2010, at 10:00 a.m. central time to discuss its results as well as future expectations. Investors may listen to the conference call live on the Company’s web site, www.oreillyauto.com, by clicking on “Investor Relations” and then “News Room.” A replay of the call will also be available on the Company’s website following the conference call. We invite interested analysts to join our call. The dial-in number for the call is (706) 679-5789; the conference call ID number is 83568329.

About O’Reilly Automotive, Inc.

O’Reilly Automotive, Inc. is one of the largest specialty retailers of automotive aftermarket parts, tools, supplies, equipment and accessories in the United States, serving both the do-it-yourself and professional installer markets. Founded in 1957 by the O’Reilly family, the Company operated 3,492 stores in 38 states as of June 30, 2010.

Forward-Looking Statements

The Company claims the protection of the safe-harbor for forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. You can identify these statements by forward-looking words such as “expect,” “believe,” “anticipate,” “should,” “plan,” “intend,” “estimate,” “project,” “will” or similar words. In addition, statements contained within this press release that are not historical facts are forward-looking statements, such as statements discussing among other things, expected growth, store development, CSK DOJ investigation resolution, integration and expansion strategy, business strategies, future revenues and future performance. These forward-looking statements are based on estimates, projections, beliefs and assumptions and are not guarantees of future events and results. Such statements are subject to risks, uncertainties and assumptions, including, but not limited to, competition, product demand, the market for auto parts, the economy in general, inflation, consumer debt levels, governmental approvals, our ability to hire and retain qualified employees, risks associated with the integration of acquired businesses such as the integration of CSK Auto Corporation, weather, terrorist activities, war and the threat of war. Actual results may materially differ from anticipated results described or implied in these forward-looking statements. Please refer to the “Risk Factors” section of the annual report on Form 10-K for the year ended December 31, 2009, for additional factors that could materially affect our financial performance.

For further information contact:	Investor & Media Contacts
	Mark Merz (417) 829-5878
	Patrick Lee (417) 862-2674 ext. 4536

O’REILLY AUTOMOTIVE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

	June 30, 2010			June 30, 2009			December 31, 2009
	(Unaudited)			(Unaudited)			(Note)
Assets
Current assets:
Cash and cash equivalents	$	31,611		$	41,024		$	26,935
Accounts receivable, net		129,769			118,538			107,887
Amounts receivable from vendors		66,823			64,728			63,110
Inventory		1,932,479			1,736,140			1,913,218
Deferred income taxes		62,588			92,619			85,934
Other current assets		34,227			32,721			29,635
Total current assets		2,257,497			2,085,770			2,226,719
Property and equipment, at cost		2,532,342			2,180,931			2,353,240
Less: accumulated depreciation and amortization		701,597			556,837			626,861
Net property and equipment		1,830,745			1,624,094			1,726,379
Notes receivable, less current portion		21,084			16,082			12,481
Goodwill		743,780			744,749			744,313
Deferred income taxes		—			15,129			—
Other assets, net		63,413			81,658			71,579
Total assets	$	4,916,519		$	4,567,482		$	4,781,471
Liabilities and shareholders’ equity
Current liabilities:
Accounts payable	$	854,659		$	818,873		$	818,153
Self insurance reserves		70,224			69,024			67,580
Accrued payroll		53,876			47,394			42,790
Accrued benefits and withholdings		44,716			42,796			44,295
Income taxes payable		23,635			6,901			8,068
Other current liabilities		156,844			154,645			143,781
Current portion of long-term debt		105,150			10,752			106,708
Total current liabilities		1,309,104			1,150,385			1,231,375
Long-term debt, less current portion		479,233			785,868			684,040
Deferred income taxes		26,582			—			18,321
Other liabilities		171,148			153,789			161,870
Shareholders’ equity:
Common stock, $0.01 par value:
Authorized shares – 245,000,000
Issued and outstanding shares – 138,670,036 as of June 30, 2010, 136,129,931 as of June 30, 2009, and 137,468,063 as of December 31, 2009		1,387			1,361			1,375
Additional paid-in capital		1,087,337			994,789			1,042,329
Retained earnings		1,847,194			1,490,975			1,650,123
Accumulated other comprehensive loss		(5,466	)		(9,685	)		(7,962	)
Total shareholders’ equity		2,930,452			2,477,440			2,685,865
Total liabilities and shareholders’ equity	$	4,916,519		$	4,567,482		$	4,781,471

Note: The balance sheet at December 31, 2009, has been derived from the audited Consolidated Financial Statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

O’REILLY AUTOMOTIVE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

(In thousands, except per share data)

	Three Months Ended June 30,						Six Months Ended June 30,
	2010			2009			2010			2009
Sales	$	1,381,241		$	1,251,377		$	2,661,308		$	2,415,126
Cost of goods sold, including warehouse and distribution expenses		708,608			647,608			1,370,328			1,268,687
Gross profit		672,633			603,769			1,290,980			1,146,439
Selling, general and administrative expenses		476,469			454,094			926,371			883,428
Accrual of legacy CSK DOJ investigation charge		15,000			—			15,000			—
Operating income		181,164			149,675			349,609			263,011
Other income (expense), net:
Interest expense		(11,146	)		(10,961	)		(22,025	)		(23,021	)
Interest income		503			361			899			787
Other, net		924			390			1,438			873
Total other expense, net		(9,719	)		(10,210	)		(19,688	)		(21,361	)
Income before income taxes		171,445			139,465			329,921			241,650
Provision for income taxes		71,850			53,950			132,850			93,300
Net income	$	99,595		$	85,515		$	197,071		$	148,350
Basic income per common share:
Net income per common share	$	0.72		$	0.63		$	1.43		$	1.10
Weighted-average common shares outstanding		138,230			135,773			137,908			135,410
Income per common share-assuming dilution:
Net income per common share	$	0.71		$	0.62		$	1.40		$	1.08
Adjusted weighted-average common shares outstanding		141,117			137,548			140,418			136,846

O’REILLY AUTOMOTIVE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(In thousands)

	Six Months Ended June 30,
	2010			2009
Operating activities:
Net income	$	197,071		$	148,350
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization on property and equipment		78,023			70,124
Amortization of intangibles		1,914			3,965
Amortization of premium on exchangeable notes		(372	)		(372	)
Amortization of debt issuance costs		4,278			4,227
Deferred income taxes		33,248			11,348
Share based compensation programs		8,438			11,623
Other		3,061			5,437
Changes in operating assets and liabilities:
Accounts receivable		(25,676	)		(16,281	)
Inventory		(19,261	)		(162,664	)
Accounts payable		36,298			80,239
Other		38,721			(3,233	)
Net cash provided by operating activities		355,743			152,763
Investing activities:
Purchases of property and equipment		(182,272	)		(231,172	)
Proceeds from sale of property and equipment		1,706			1,365
Payments received on notes receivable		2,676			1,923
Other		(2,704	)		(3,316	)
Net cash used in investing activities		(180,594	)		(231,200	)
Financing activities:
Proceeds from borrowings on asset-based revolving debt		277,000			338,250
Payments on asset-based revolving debt		(478,500	)		(276,150	)
Principal payments on capital leases		(4,493	)		(5,655	)
Tax benefit of stock options exercised		7,763			4,878
Net proceeds from issuance of common stock		27,757			26,417
Other		—			420
Net cash (used in)/provided by financing activities		(170,473	)		88,160
Net increase in cash and cash equivalents		4,676			9,723
Cash and cash equivalents at beginning of period		26,935			31,301
Cash and cash equivalents at end of period	$	31,611		$	41,024
Supplemental disclosures of cash flow information:
Income taxes paid	$	76,551		$	78,038
Interest paid, net of capitalized interest		18,124			19,648
Property and equipment acquired through issuance of capital lease obligations		—			5,836

O’REILLY AUTOMOTIVE, INC. AND SUBSIDIARIES

SELECTED FINANCIAL INFORMATION

	June 30,
	2010		2009
Inventory turnover (1)	1.4		1.5
Inventory turnover, net of payables (2)	2.5		2.9
AP to inventory (3)	44.2	%	47.2	%
Debt-to-capital (4)	16.6	%	24.3	%
Return on equity (5)	13.5	%	10.0	%
Return on assets (6)	7.7	%	5.4	%

	Three Months Ended June 30,
	2010		2009
Other Information (in thousands):
Capital Expenditures	$	91,547	$	79,910
Depreciation and Amortization	$	40,002	$	38,057
Interest Expense	$	11,146	$	10,961
Lease and Rental Expense	$	55,976	$	56,843
Sales per weighted-average square foot (7)	$	55.51	$	52.28
Square footage (in thousands)		24,732		23,926
Sales per weighted-average store (in thousands) (8)	$	393	$	369
Total employment		46,265		43,841

	Store Count by Brand
	O’Reilly	Checker		Schuck’s		Kragen		Total
December 31, 2009	2,533	321		75		492		3,421
New	73	—		—		—		73
Converted	460	(159	)	(68	)	(233	)	—
Closed	—	—		—		(2	)	(2	)
June 30, 2010	3,066	162		7		257		3,492

(1) Calculated as cost of sales for the last 12 months divided by average inventory. Average inventory is calculated as the average of inventory for the trailing four quarters used in determining the numerator.

(2) Calculated as cost of sales for the last 12 months divided by average net inventory. Average net inventory is calculated as the average of inventory less accounts payable for the trailing four quarters used in determining the numerator.

(3) Accounts payable divided by inventory.

(4) The sum of long-term debt and current portion of long-term debt, divided by the sum of long-term debt, current portion of long-term debt and total shareholders’ equity.

(5) Last 12 months net income, before the impact of the charge related to the legacy CSK DOJ investigation, divided by average shareholders’ equity. Due to the nature of the CSK related charge, the adjustment is made to provide comparable results. Average shareholders’ equity is calculated as the average of shareholders’ equity for the trailing four quarters used in determining the numerator.

(6) Last 12 months net income, before the impact of the charge related to the legacy CSK DOJ investigation, divided by average total assets. Due to the nature of the CSK related charge, the adjustment is made to provide comparable results. Average total assets is calculated as the average total assets for the trailing four quarters used in determining the numerator.

(7) Total sales less jobber sales, divided by weighted-average square feet. Weighted-average sales per square foot is weighted to consider the approximate dates of store openings or expansions.

(8) Total sales less jobber sales, divided by weighted-average stores. Weighted-average sales per store is weighted to consider the approximate dates of store openings or expansions.

O’REILLY AUTOMOTIVE, INC. AND SUBSIDIARIES

RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL INFORMATION

(Unaudited)

(In thousands, except per share and operating margin data)

	Three Months Ended June 30,						Six Months Ended June 30,
	2010			2009			2010			2009
GAAP operating income	$	181,164		$	149,675		$	349,609		$	263,011
Accrual of legacy CSK DOJ investigation charge		15,000			—			15,000			—
Non-GAAP adjusted operating income	$	196,164		$	149,675		$	364,609		$	263,011
GAAP operating margin		13.1	%		12.0	%		13.1	%		10.9	%
Accrual of legacy CSK DOJ investigation charge		1.1	%		—			0.6	%		—
Non-GAAP adjusted operating margin		14.2	%		12.0	%		13.7	%		10.9	%
GAAP net income	$	99,595		$	85,515		$	197,071		$	148,350
Accrual of legacy CSK DOJ investigation charge		15,000			—			15,000			—
Non-GAAP adjusted net income	$	114,595		$	85,515		$	212,071		$	148,350
GAAP diluted net income per common share	$	0.71		$	0.62		$	1.40		$	1.08
Accrual of legacy CSK DOJ investigation charge		0.10			—			0.11			—
Non-GAAP adjusted diluted net income per common share	$	0.81		$	0.62		$	1.51		$	1.08
Adjusted weighted-average common shares outstanding – assuming dilution		141,117			137,548			140,418			136,846