O'Reilly Automotive, Inc., together with its subsidiaries, operates as a retailer and supplier of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States, Puerto Rico, and Mexico. The company provides new and remanufactured automotive hard parts and maintenance items, such as alternators, batteries, brake system components, belts, chassis parts, driveline parts, engine parts, fuel pumps, hoses, starters, temperature control, water pumps, antifreeze, appearance products, engine additives, filters, fluids, lighting products, and oil and wiper blades; and accessories, including floor mats, seat covers, and truck accessories. It also offers auto body paint and related materials, automotive tools, and professional service provider service equipment. In addition, the company provide 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; and professional paint shop mixing and related materials. Further, it offers do-it-yourself and professional service for domestic and imported automobiles, vans, and trucks. The company was founded in 1957 and is headquartered in Springfield, Missouri.

AutoZone, Inc. retails and distributes automotive replacement parts and accessories in the United States, Mexico, and Brazil. The company provides various products for cars, sport utility vehicles, vans, and light trucks, including new and remanufactured automotive hard parts, maintenance items, accessories, and non-automotive products. It also offers A/C compressors, batteries and accessories, bearings, belts and hoses, calipers, chassis, clutches, CV axles, engines, fuel pumps, fuses, ignition and lighting products, mufflers, radiators, starters and alternators, thermostats, and water pumps, as well as tire repairs. In addition, the company provides maintenance products, such as antifreeze and windshield washer fluids; brake drums, rotors, shoes, and pads; brake and power steering fluids, and oil and fuel additives; oil and transmission fluids; oil, cabin, air, fuel, and transmission filters; oxygen sensors; paints and accessories; refrigerants and accessories; shock absorbers and struts; spark plugs and wires; and windshield wipers. Further, it offers air fresheners, cell phone accessories, drinks and snacks, floor mats and seat covers, interior and exterior accessories, mirrors, performance products, protectants and cleaners, sealants and adhesives, steering wheel covers, tools, vehicle entertainment systems, and wash and wax products, as well as towing services. Additionally, the company provides a sales program that offers commercial credit and delivery of parts and other products; sells automotive diagnostic, repair, collision, and shop management information software under the ALLDATA brand through alldata.com; Duralast branded products through duralastparts.com; and automotive hard parts, maintenance items, accessories, and non-automotive products through autozone.com. AutoZone, Inc. was founded in 1979 and is headquartered in Memphis, Tennessee.

Genuine Parts Company distributes automotive replacement parts, and industrial parts and materials. It operates in two segments: Automotive Parts Group and Industrial Parts Group segments. The company distributes automotive replacement parts for hybrid and electric vehicles, trucks, SUVs, buses, motorcycles, recreational vehicles, farm vehicles, small engines, farm equipment, marine equipment, and heavy duty equipment; and equipment and parts used by repair shops, service stations, fleet operators, automobile and truck dealers, leasing companies, bus and truck lines, mass merchandisers, farms, and individuals. It also distributes industrial replacement parts and related supplies, such as abrasives, adhesives, sealants and tape, bearings, chemicals, cutting tools, electrical, facility maintenance, hose and fittings, hydraulics, janitorial, mechanical power transmission, pneumatics, process pumps and equipment, safety, seals and gaskets, and tools and testing instruments, as well as maintenance, repair, and operation customers in aggregate and cement, automotive, chemical and allied products, equipment and machinery, equipment rental and leasing, fabricated metals, food and beverage, iron and steel, lumber and wood, oil and gas, pulp and paper, and rubber products. In addition, the company provides various services and repairs comprising gearbox and fluid power and process pump assembly and repair, hydraulic drive shaft repair, electrical panel assembly and repair, hose and gasket manufacture and assembly. It operates in the United States, Canada, France, the United Kingdom, Ireland, Germany, Poland, the Netherlands, Belgium, Spain, Portugal, Australia, New Zealand, Mexico, Indonesia, and Singapore. The company was incorporated in 1928 and is headquartered in Atlanta, Georgia.

Littelfuse, Inc. designs, manufactures, and sells electronic components, modules, and subassemblies in the Americas, Asia-Pacific, and Europe. The company operates through Electronic, Transportation, and Industrial segments. The Electronics segment offers fuses and fuse accessories, positive temperature coefficient resettable fuses, electromechanical switches and interconnect solutions, polymer electrostatic discharge suppressors, varistors, reed switch based magnetic sensing products, and gas discharge tubes; and discrete transient voltage suppressor (TVS) diodes, TVS diode arrays, protection and switching thyristors, metal-oxide-semiconductor field-effect transistors and diodes, and insulated gate bipolar transistors. This segment serves industrial motor drives and power conversion, automotive electronics, electric vehicle and related charging infrastructure, aerospace, power supplies, data centers, telecommunications, medical devices, alternative energy, building and home automation, appliances, and mobile electronics markets. The Transportation segment provides blade, resettable, and high-current and high-voltage fuses, as well as battery cable protectors; fuses, switches, relays, circuit breakers, and power distribution modules; and sensor products. This segment serves heavy-duty truck, construction, agriculture, material handling, and marine. The Industrial segment offers industrial fuses, protection relays, contactors, transformers, residual current devices, ground fault circuit interrupters, residual current monitors, arc fault detection devices, and temperature sensors for use in renewable energy and energy storage systems, electric vehicle infrastructure, HVAC systems, industrial safety, non-residential construction, MRO, mining, and factory automation. It sells its products through distributors, direct sales force, and manufacturers' representatives. Littelfuse, Inc. was founded in 1927 and is headquartered in Chicago, Illinois.

Dorman Products, Inc. supplies replacement and upgrade parts for passenger cars, light trucks, medium- and heavy-duty trucks, utility terrain vehicles, and all-terrain vehicles in the motor vehicle aftermarket industry in the United States and internationally. It offers engine products, including intake and exhaust manifolds, fans, thermostat housings, and throttle bodies; undercar products comprising fluid lines, fluid reservoirs, connectors, 4-wheel drive components and axles, drain plugs, other engine, and transmission and axle components; steering and suspension products consist of control arms, ball joints, tie-rod ends, brake hardware and hydraulics, wheel and axle hardware, suspension arms, knuckles, links, bushings, and leaf springs, as well as other suspension, steering, and brake components; body products, such as door handles and hinges, window lift motors, window regulators, switches and handles, wiper components, lighting, electrical, and other interior and exterior vehicle body components, including windshields for UTVs; electronics products comprise new and remanufactured modules, clusters and sensors; and hardware products, such as threaded bolts and auto body fasteners, automotive and home electrical wiring components, and other hardware assortments and merchandise. The company also provides air tanks, shock absorbers, and air springs; transmission control modules, variable geometry timing actuators, and other control modules and sensors; new control arms, suspension components, door lock actuators, and handles for electric vehicles; and leaf springs, intake manifolds, exhaust manifolds, window regulators, radiator fan assemblies, tire pressure monitor sensors, exhaust gas recirculation coolers, UTV windshields, and complex electronics modules. It markets its products under the DORMAN, DORMAN OE FIX, HELP!, Conduct-Tite, Dayton Parts, SuperATV, Keller Performance Products, Assault Industries, Gboost, and GDP brands. Dorman Products, Inc. was founded in 1918 and is headquartered in Colmar, Pennsylvania.

LCI Industries, together with its subsidiaries, manufactures and supplies engineered components for the manufacturers of recreational vehicles (RVs) and adjacent industries in the United States and internationally. It operates through two segments: Original Equipment Manufacturers (OEM) and Aftermarket. The OEM segment manufactures and distributes a range of engineered components, such as steel chassis and related components; axles, ABS, and suspension solutions; slide-out mechanisms and solutions; thermoformed bath, kitchen, and other products; vinyl, aluminum, and frameless windows; manual, electric, and hydraulic stabilizer and leveling systems; entry, luggage, patio, and ramp doors; furniture and mattresses; electric and manual entry steps; awnings and awning accessories; electronic components; appliances; air conditioners; televisions and sound systems; tankless water heaters; towing products; truck accessories; and other accessories. This segment serves OEMs of RVs and adjacent industries, including buses; trailers used to haul boats, livestock, equipment, and other cargo; trucks; boats; trains; manufactured homes; and modular housing. The Aftermarket segment supplies engineered components to aftermarket channels of the recreation and transportation markets for retail dealers, wholesale distributors, and service centers, as well as direct to retail customers through the Internet. This segment also sells replacement glass and awnings to fulfill insurance claims; and biminis, covers, buoys, fenders to the marine industry, towing products, truck accessories, appliances, air conditioners, televisions, sound systems, and tankless water heaters. The company was formerly known as Drew Industries Incorporated and changed its name to LCI Industries in December 2016. LCI Industries was founded in 1956 and is based in Elkhart, Indiana.

Advance Auto Parts, Inc. provides automotive replacement parts, accessories, batteries, and maintenance items for domestic and imported cars, vans, sport utility vehicles, and light and heavy duty trucks. The company offers battery accessories; belts and hoses; brakes and brake pads; chassis and climate control parts; clutches and drive shafts; engines and engine parts; exhaust systems and parts; hub assemblies; ignition components and wires; radiators and cooling parts; starters and alternators; and steering and alignment parts. It also offers air conditioning chemicals and accessories; air fresheners; antifreeze and washer fluids; electrical wires and fuses; electronics; floor mats, seat covers, and interior accessories; hand and specialty tools; lighting products; performance parts; sealants, adhesives, and compounds; tire repair accessories; vent shades, mirrors and exterior accessories; washes, waxes and cleaning supplies; and wiper blades. In addition, the company offers air filters; fuel and oil additives; fuel filters; grease and lubricants; motor oils; oil filters, part cleaners and treatments; and transmission fluids for engine maintenance. Further, it offers battery and wiper installation; engine light scanning and checking; electrical system testing, including batteries, starters, and alternators; oil and battery recycling; and loaner tool program services. Additionally, the company sells its products through its website. It serves professional installers and do-it-yourself customers. The company operates stores under the Advance Auto Parts and Carquest names, as well as branches under the Worldpac name. The company has stores in the United States, Puerto Rico, the U.S. Virgin Islands, and Canada; and independently owned Carquest branded stores in Mexico and various Caribbean Islands. Advance Auto Parts, Inc. was founded in 1929 and is based in Raleigh, North Carolina.

Standard Motor Products, Inc. manufactures and distributes replacement automotive parts in the United States and internationally. The company operates through three segments: Vehicle Control, Temperature Control, and Engineered Solutions segments. The company provides components for the ignition, emissions, and fuel delivery systems, such as air injection and induction components, air management valves, regulators and solenoids, exhaust gas recirculation components, fuel injectors and related components, fuel valves, ignition coils, connectors and sockets, modules, pumps, relays and fuses, starting and charging system parts, and vapor and purge components. It also offers electrical switches and actuators; chassis and drivetrain sensors, such as anti-lock brake and vehicle speed sensors; fluid level sensors; pressure sensors comprising tire pressure monitoring; temperature sensors; sensors for advanced driver assistance systems; battery cables, pigtails, and sockets, as well as various electrical wire, terminals, connectors, and tools for servicing a vehicle's electrical system; and spark plug, coil on plug boots, and ignition system accessories. In addition, the company offers AC system components that include compressors, air conditioning repair kits, connecting lines, heat exchangers, and expansion devices; parts that provide engine, transmission, electric drive motor, and battery temperature management; thermal management products, sensors, switches, power distribution, electrification and electronics, injections and fuel delivery, ignition and emissions, and clamping devices for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics, and lawn and garden sectors. It serves retailers and distributors, original equipment manufacturers and their suppliers, system integrators, and original equipment service part manufacturers. The company was founded in 1919 and is headquartered in Long Island City, New York.