O’Reilly Automotive (NASDAQ: ORLY) and its subsidiaries engage in the retail of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States. The company’s stores sell its brand name and private label products for domestic and imported automobiles, vans, and trucks to do-it-yourself customers and professional service providers. As of December 31, 2011, it operated 3,740 stores in 39 states. For more information visit the company’s Web site at: www.oreillyauto.com

William Blair & Company is a global investment banking and asset management firm committed to building enduring relationships with clients and providing expertise and solutions to meet their evolving needs. An independent and employee-owned firm, William Blair is based in Chicago, and has office locations in 10 cities, including London, New York, Shanghai, and Zurich. For more information on William Blair & Company, visit www.williamblair.com

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