Auto Parts Manufacturers NAICS 3363

        Auto Parts Manufacturers

Unlock access to the full platform with more than 900 industry reports and local economic insights.

Get Free Trial

Get access to this Industry Profile including 18+ chapters and more than 50 pages of industry research.

Purchase Report

Industry Summary

The 3,616 auto parts manufacturers in the US produce components, modules, and systems for auto manufacturers (also known as original equipment manufacturers or OEMs), other parts suppliers, and the aftermarket. About 70% of automotive parts are for OEMs, while 30% are destined for the repair/modification market (aftermarket).

Dependence on Auto Industry

The auto manufacturing industry is global and dominated by a few large companies.

Vulnerability to Commodity Prices

Auto parts manufacturers are vulnerable to variability in costs of raw materials, particularly steel, oil, copper, resins, and rubber.


Recent Developments

Jun 16, 2026 - Americans Keeping Cars Longer, Boosting Auto Part Demand
  • Americans are keeping their vehicles longer than ever—the average age of a U.S. vehicle has reached a record 13 years—as high new-car prices, elevated interest rates, and economic uncertainty push consumers to delay replacements. This shift is reshaping the automotive value chain, creating a stronger, more durable market for auto parts manufacturers and aftermarket suppliers as older vehicles require more maintenance, repairs, and replacement components. Automakers, dealers, and repair networks are increasingly investing in service operations, diagnostics, and parts businesses to offset slower new-vehicle sales, while independent repair shops and aftermarket providers gain importance as more vehicles age out of warranty. For auto parts manufacturers, the aging vehicle fleet represents a long-term growth opportunity. Demand for replacement parts, maintenance products, and repair technologies is expected to remain strong as consumers focus on extending vehicle life rather than purchasing new cars.
  • Rising inflation, tariffs, and the ongoing Middle East war are expected to further weaken US auto demand in 2026, pressuring vehicle and parts imports while boosting demand for aftermarket repair components, according to S&P Global. Containerized US imports of automobiles and auto parts fell 9.4% in 2025 as higher borrowing costs, steel tariffs and elevated vehicle prices weighed on consumers, with prolonged conflict expected to push prices even higher and suppress container volumes further. At the same time, aftermarket suppliers such as Advance Auto Parts are benefiting as consumers delay new vehicle purchases and keep older cars on the road longer. Auto parts importers are also accelerating sourcing diversification away from China toward Southeast Asia, South Korea and Japan, though industry experts warn supply chain shifts could take up to two years amid continued tariff uncertainty and volatile trade policies.
  • The automotive right-to-repair debate has become a defining issue for the US aftermarket industry as vehicles grow more software-driven and connected. Independent repair shops, parts distributors, and aftermarket manufacturers argue that automakers are increasingly restricting access to diagnostics, telematics data, and calibration systems needed to service modern vehicles. Industry leaders warn that limited access could shift more repair business to dealerships, reduce competition, and weaken demand for aftermarket parts. At the center of the fight is control over vehicle data, which OEMs say is necessary to protect cybersecurity and safety, while aftermarket advocates argue consumers should have the freedom to choose where their vehicles are repaired. As EV adoption and advanced driver-assistance systems expand, the outcome of the right-to-repair battle could fundamentally reshape the future of the automotive aftermarket.
  • Inventories are piling up across the auto parts industry, but it’s less a sign of collapse than a case of companies overcorrecting after the chaos of recent years. In the wake of pandemic and tariff shortages, manufacturers ditched lean “just-in-time” models and began stockpiling parts, only to find demand cooling as higher interest rates slowed car sales and repair activity normalized. At the same time, the industry’s uneven shift to electric vehicles has left suppliers heavy on legacy gas-powered components even as long-term demand drifts elsewhere. A final twist: as supply chains unclogged, delayed shipments landed all at once, further swelling stockrooms. The backdrop isn’t weak demand (the global aftermarket is still expected to top $500 billion in 2026, according to Motor Intelligence) but rather a mistimed balancing act between obstacles largely beyond the industry’s control.

Industry Revenue

Auto Parts Manufacturers


Industry Structure

Industry size & Structure

The average auto parts manufacturer employs 153 workers and generates $76 million in annual revenue.

    • The auto parts manufacturing industry consists of about 3,616 companies that employ 553,300 workers and generate $276.5 billion annually.
    • The five major component systems in an average internal combustion engine car include the body exterior (25% of total costs), interior (24%), electronics and electrical (18%), powertrain (18%), and chassis (15%), according to Munro & Associates.
    • Large companies include Adient, BorgWarner, and Lear.

                                    Industry Forecast

                                    Industry Forecast
                                    Auto Parts Manufacturers Industry Growth
                                    Source: Vertical IQ and Inforum

                                    Vertical IQ Industry Report

                                    For anyone actively digging deeper into a specific industry.

                                    50+ pages of timely industry insights

                                    18+ chapters

                                    PDF delivered to your inbox

                                    Privacy Preference Center