O'Reilly Automotive, Inc., together with its subsidiaries, engages in the retail of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States. The company provides new and remanufactured automotive hard parts, such as alternators, starters, fuel pumps, water pumps, brake system components, batteries, belts, hoses, temperature controls, chassis parts, driveline parts, and engine parts; maintenance items comprising oil, antifreeze products, fluids, filters, wiper blades, lighting products, engine additives, and appearance products; and accessories, such as floor mats, seat covers, and truck accessories. Its stores offer auto body paint and related materials, automotive tools, and professional service provider service equipment. The company's stores also offer enhanced services and programs comprising used oil, oil filter, and battery recycling; battery, wiper, and bulb replacement; battery diagnostic testing; electrical and module testing; check engine light code extraction; loaner tool program; drum and rotor resurfacing; custom hydraulic hoses; professional paint shop mixing and related materials; and machine shops. Its stores provide do-it-yourself and professional service provider customers a selection of brand name, house brands, and private label products for domestic and imported automobiles, vans, and trucks. As of December 31, 2017, the company operated 5,019 stores in 47 states. O'Reilly Automotive, Inc. was founded in 1957 and is headquartered in Springfield, Missouri.