Auto Parts Manufacturers NAICS 3363

        Auto Parts Manufacturers

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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

May 19, 2026 - Auto Industry Demand Getting Hit From All Sides
  • 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.
  • The auto parts industry is growing largely because vehicles are staying on the road longer, with the average US vehicle now around 12-13 years old. As cars age (especially beyond 10-12 years) they require more frequent and costly repairs, driving strong demand for replacement parts like engines, suspensions, and electrical components. This trend is fueled by high new car prices, improved vehicle durability, and economic pressures that lead consumers to delay purchasing new vehicles and instead maintain existing ones. Older vehicles also shift more repair activity toward independent shops and DIY customers, benefiting aftermarket retailers. While this creates steady, recession-resistant demand, it also brings challenges such as increased repair complexity and parts availability for very old models. Overall, the aging vehicle fleet is a key structural driver making the aftermarket more maintenance-focused and consistently growing.

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

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