Motor Vehicle Electrical and Electronic Equipment Manufacturing (NAICS 33632)

A Histometrics industry-level primer for public-market and private investors

Short primer — single-child level. In the North American Industry Classification System (NAICS), this five-digit industry contains exactly one six-digit child, 336320, with the same name. The two levels are effectively identical: everything in 33632 is 336320. This page gives the rollup's own ground-truth federal stats and the shape of the opportunity, then points you to the full child primer for detail. For the complete treatment — scope exclusions, the company-by-company investable universe, margins, demand drivers, regulation, private-market diligence, and risks — read the 336320 primer.

1. Overview

This industry makes the electrical and electronic guts of a vehicle: the parts that generate, distribute, ignite, sense, and control power — alternators, starters, ignition coils and spark plugs, wiring harnesses (the bundled-wire "nervous system" that runs through every car), lighting units, instrument clusters, and the electronic control modules that manage the engine and increasingly the whole vehicle [1]. These firms are overwhelmingly suppliers, not brands: they sell components to vehicle assemblers (Ford, General Motors, Toyota, Tesla and the rest) and to the replacement-parts (aftermarket) channel.

The reason an investor should care is a single structural idea: the number of cars built each year is flat-to-declining in mature markets, but the dollar value of electronics inside each car keeps rising — from safety mandates, electrification, driver-assistance features, and the shift to software-defined vehicles. Electronic content is projected to reach roughly 35–40% of total vehicle value by 2035 [2]. That "content-per-vehicle" growth is the whole thesis.

2. What's inside — and why this level equals its one child

NAICS is a nested hierarchy: a five-digit industry normally splits into two or more six-digit national industries. Here it does not. NAICS 33632 has a single child:

Because there is only one child, the five-digit rollup and the six-digit industry describe the same set of establishments and the same products. There is nothing to "add up." The distinction is purely a formality of the classification system, so the two levels carry identical statistics and an identical investment story. Everything below is therefore this level's own data — which is also 336320's data — presented in brief.

The scope trap. Because the level equals its child, it inherits the child's scope boundary exactly — and that boundary is narrower than everyday language suggests. This code is the electrical-hardware and control-module core, not the whole electronics bill of materials of a modern car. Vehicle lamp bulbs (335110), automotive storage batteries (335911), electric traction motors for EVs (335312), car audio and infotainment head units (334310), and semiconductors (334413) all sit in other codes [1]. Cutting the other way, the Census definition is broader than road vehicles: qualifying products may also be used in aircraft, trains, ships and stationary engines [3]. Any market report that treats 33632/336320 as a proxy for "automotive electronics" or "EV components" materially misstates the addressable market — a caution worth carrying into every number below.

3. How big it is (this level's rollup figures)

Ground-truth federal figures for the U.S. establishments classified here. Because 33632 = 336320, these are the level's own totals (no aggregation across children was required).

The employment trend is down, not flat. More recent Bureau of Labor Statistics data puts employment at approximately 57,700 jobs in 2025 [7], below the 60,662 the 2023 County Business Patterns count shows [5]. The two series are differently constructed and differently dated, so they are not strictly comparable — but the direction points to contraction in the domestic headcount even as the electronic content of each vehicle rises. That gap is the industry in one line: more value per car, made by fewer U.S. hands.

Concentration. By the federal measures the U.S. base looks competitive: the top 4 firms hold 29.4% of receipts, the top 8 hold 43.7%, the top 20 hold 67.6%, and the top 50 hold 84.4% [4]. The Herfindahl-Hirschman Index (HHI, a standard concentration gauge where the U.S. Department of Justice treats a reading below 1,500 as "unconcentrated") is just 387.4 [4] — statistically a fragmented industry. Read that carefully, though: it measures U.S.-located establishments across all of the code's product lines lumped together. Within specific niches — wiring harness, or auto-dimming mirrors — the real-world global market is an oligopoly of a few giants.

The undercount caveat (important here). These federal numbers materially understate the industry's economic footprint. First, scope: broader "U.S. automobile electronics" market estimates run around $62 billion for 2024 [8], because they also count the chips, batteries, and infotainment that this code assigns to other NAICS codes (Section 2). Second and bigger: a large share of the electrical/electronic content in U.S.-sold vehicles is imported or made by foreign-owned firms, and much labor-intensive assembly (especially wiring harness) has moved to Mexico, where labor can run up to ~70% cheaper than in the U.S. [9]. So the ~$28 billion of U.S. shipments is the domestic-manufacturing slice, not the value of this equipment consumed in the U.S. market. The industry is also heavily foreign- and private-owned, so no single measure of U.S.-listed companies captures its true size.

4. The investable universe (where value concentrates)

With only one child, the investable map is simply 336320's map — there is no second sub-industry where value hides. The key fact: no U.S.-listed company is a pure play here. Every listed name is a diversified Tier-1 (top-tier) or aftermarket supplier with meaningful electrical/electronic auto content — Aptiv (NYSE: APTV), the largest of them at $20.4 billion of 2025 revenue [10]; the newly spun-out wiring-harness pure-play Versigent (NYSE: VGNT), separated from Aptiv on April 1, 2026 and now the closest thing to a listed 336320 pure play [11]; Lear (NYSE: LEA), BorgWarner (NYSE: BWA), Sensata (NYSE: ST), Visteon (Nasdaq: VC), Phinia (NYSE: PHIN), Gentex (Nasdaq: GNTX); and on the aftermarket side Standard Motor Products (NYSE: SMP) and remanufacturer Motorcar Parts of America (Nasdaq: MPAA). Amphenol (NYSE: APH) touches the industry through connectors and sensors, with automotive one of several end-markets.

Customer concentration is the structural feature to underwrite. These suppliers sell to a handful of buyers: Aptiv's ten largest customers were approximately 56% of 2025 sales [10], and Gentex's three largest automotive customers were 18%, 11% and 10% of 2025 consolidated sales [12]. Revenue can walk out the door through an automaker's weak model, an insourcing decision, or a directed purchase — without the supplier ever losing a contract on paper.

Much of the actual manufacturing base is private or foreign-owned — Bosch (roughly 94% of share capital held by the Robert Bosch Stiftung, with voting control through an industrial trust [13]), Denso, Yazaki (expressly privately held), Sumitomo, Furukawa, Valeo, NGK — alongside private-equity-held platforms such as Marelli (KKR), Champion/Tenneco (Apollo), and Panasonic's automotive-systems arm, which passed into private hands in 2024–2025. The full company table, revenues, margins, and relevance notes are in the 336320 primer, Section 4.

5. How the money works

These are manufacturers on long-term program contracts. An automaker awards a supplier the parts for a specific vehicle platform, usually for the multi-year life of that model. Purchase orders typically fix price but not volume, and commonly impose annual price reductions. The revenue formula is:

content per vehicle × vehicle production volume, plus aftermarket sales.

• Content per vehicle is the lever with structural upside — rising electronics content lets a supplier grow faster than the underlying build rate. Suppliers track it as a backlog or "book of business" of program wins that convert to revenue as those models launch; Visteon reported $6.1 billion of new business wins in 2024 [14].
• Volume ties earnings to the auto cycle — U.S. light-vehicle sales totaled 16.2 million units in 2025 [15] — and when automakers cut production, fixed-cost-heavy suppliers feel it fast. The business is also program-cyclical: earnings can fall in a stable vehicle market if an important platform ends before its replacement launches.
• Margins are thin, cyclical, and spread far wider than the average implies. The average global auto supplier earned an operating (EBIT, earnings before interest and taxes) margin of about 4.7% in 2024 [16]. Within this code the range is the story: hand-assembled wiring harness — a single vehicle's harness can weigh ~150 pounds [9] — sits at the bottom, with Lear's E-Systems segment at a 3.1% margin in 2025, down from 4.1% the prior year [17]; higher-technology electronics sit far above, with Gentex running a 34.7% gross margin in 2025 [18] and Visteon an 11.6% fourth-quarter adjusted EBITDA margin [14]. Even the strong end is not insulated: unrecovered tariffs cost Gentex roughly 110 basis points of gross margin in 2025 [12].
• The aftermarket is the steadier cousin — replacement parts (Standard Motor Products, Motorcar Parts of America) track the size and age of the vehicle fleet and miles driven, not new-car production. See the 336320 primer, Section 5 for the detail.

6. What drives demand

Content-per-vehicle growth is the dominant driver: electrification roughly doubles electronic content versus a gasoline car (battery-electric vehicles carry an estimated $600–$800 of power electronics alone), and advanced driver-assistance systems (ADAS) are the fastest-growing electronics segment [2]. Safety regulation, new-vehicle production volumes (set by interest rates and affordability), and the age and size of the existing vehicle fleet (which feeds the aftermarket) round out the list.

Two refinements matter at this level. First, electrification is genuinely double-edged and its pace is not linear — more power electronics and wiring per electric vehicle, but fewer of the legacy parts (spark plugs, ignition coils, starters, alternators, fuel-system electronics) some incumbents depend on. Roughly 1.5 million electric cars sold in the United States in 2025, just under 10% of car sales and slightly below 2024 after federal incentives ended, while global electric-car sales exceeded 20 million, about 25% of new-car sales [19]. Hybrids sit in the sweet spot for diversified suppliers: they keep combustion content while adding battery controls, power electronics, and more complex electrical distribution. Second, the software-defined vehicle is redrawing where the value sits — distributed control units are being consolidated into domain or central computers with zonal wiring architectures meant to cut harness mass and complexity, which favors suppliers with systems, high-speed connectors, power distribution and software capability and threatens vendors of stand-alone control boxes [20].

7. Regulation

Because this level equals 336320, the regulatory picture is identical. The National Highway Traffic Safety Administration (NHTSA) sets Federal Motor Vehicle Safety Standards (FMVSS) that directly create demand for this industry's electronics — lighting (FMVSS 108), backup cameras required on new light vehicles since 2018, and most consequentially a 2024 rule (FMVSS 127) requiring automatic emergency braking, pedestrian detection and forward-collision warning on essentially all new light vehicles, with compliance targeted for September 2029 though the timeline is under industry pushback and regulatory reconsideration [21]. Emissions and on-board-diagnostics rules drive engine-control electronics.

Trade policy is the biggest current wildcard — 2025 Section 232 tariffs of 25% on imported vehicles and many parts, with partial USMCA (United States–Mexico–Canada Agreement) exemptions and an import adjustment offset, hit this industry's Mexico-heavy cost base directly [22]. A newer and less-discussed constraint sits alongside it: the Commerce Department's connected-vehicle rule restricts covered software linked to China or Russia beginning with model year 2027 and covered connectivity hardware beginning with model year 2030 (non-model-year hardware from January 1, 2029), with compliance declarations required of importers and manufacturers [23]. That can advantage compliant North American suppliers while raising provenance, audit and redesign costs. Full detail in the 336320 primer, Section 7.

8. Consolidation

The federal data shows a fragmented U.S. base (HHI 387.4) [4], but the real picture is a global oligopoly by product line — a handful of firms dominate wiring harness (Aptiv/Versigent, Yazaki, Sumitomo), auto-dimming mirrors (Gentex, alongside Magna), and ignition. The recent era is defined less by mergers than by splitting to sharpen focus: BorgWarner carved out Phinia (2023), Aptiv separated its harness business as Versigent (2026) [11], and Continental has been breaking itself apart. In parallel, private equity rolls up the mature, combustion-heavy product lines — Apollo/Tenneco, KKR/Marelli, and the take-private of Panasonic's automotive unit. The logic: separate high-multiple electronics/ADAS/software growth from cash-generative but declining legacy hardware.

9. Risks

The same risks that define 336320 define this level: cyclicality (earnings swing hard with vehicle production, and an automaker strike hits fixed-cost-heavy plants immediately); OEM (original-equipment-manufacturer) pricing power (few, powerful customers imposing annual price-downs, plus re-bid risk); customer and program concentration [10] [12]; thin margins and input-cost inflation (copper, resin, semiconductors); and tariffs and Mexico-concentration risk [22] — noting that tariff recoveries can protect profit dollars while diluting percentage margins, because reimbursement raises revenue without adding gross profit [17]. Beyond those, three risks the children now make explicit deserve equal weight: the EV transition's bifurcation (content-rich winners coexisting with legacy losers whose addressable market shrinks); technology and capital intensity (ADAS, zonal architectures and software demand rising R&D and capex, rewarding scale); and substitution — LEDs and digital controls displaced older lighting and analog parts, centralized computing may replace numerous modules, wireless links may eliminate some wiring, and automaker vertical integration can remove supplier content outright. Connected-vehicle rules add relocation and redesign exposure where components have restricted-country origins [23]. See the 336320 primer, Section 9.

10. How to invest and the outlook

Since there is no pure play, public investors buy the content-per-vehicle theme through the diversified suppliers named in Section 4 — leaning toward electronics/ADAS-weighted names (Aptiv, Sensata, Visteon, Gentex) for the growth story, the new Versigent for a listed wiring-harness pure-play, and aftermarket-weighted names (Standard Motor Products, Motorcar Parts of America) for lower cyclicality and steadier cash. Broad auto-supplier exchange-traded funds (ETFs, such as First Trust's global auto fund, ticker CARZ) give sector exposure but dilute the electronics angle with automakers and other parts. Private-market routes matter as much here — the largest suppliers are foreign-owned or family- and foundation-controlled [13], and private equity is an active consolidator, so exposure runs through PE-owned platforms and the many private Tier-2 shops, a large share operating in Mexico. Diligence in those deals is program-level rather than company-level: revenue and contribution margin by customer and platform, remaining program life, termination and change-of-control rights, tooling ownership, launch pipeline, tariff and country-of-origin exposure, and the engineering spend required merely to replace expiring programs.

The outlook is a tug-of-war: a durable content-per-vehicle tailwind (electrification, ADAS, safety mandates) pulling against flat unit volumes, a shrinking domestic headcount, thin margins, and tariff-driven cost pressure. Watch three variables: how the Section 232 tariff regime and USMCA rules settle; the pace of EV and ADAS adoption, which sets the content-growth rate; and the auto production cycle and interest rates, which set volume. These are the things to track, not settled outcomes. For the complete investment case, read the 336320 primer.

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Sources

Drawn from the child primer (336320), from which this rollup is synthesized.

1. NAICS Association (U.S. Census Bureau classification), "336320 – Motor Vehicle Electrical and Electronic Equipment Manufacturing," 2022. https://www.naics.com/naics-code-description/?code=336320
2. Mordor Intelligence / IndexBox, "Automotive Electronics Market — content per vehicle and ADAS/electrification outlook," 2025. https://www.mordorintelligence.com/industry-reports/automotive-electronics-market
3. U.S. Census Bureau, 2022 NAICS definition (NAICS 336320 scope includes non-automotive applications). https://www.census.gov/naics/?chart=2022&details=324&input=31
4. U.S. Census Bureau, 2022 Economic Census, Concentration Ratios and receipts (NAICS 336320): receipts $28.04B, 519 firms, CR4 29.4%, CR8 43.7%, CR20 67.6%, CR50 84.4%, HHI 387.4. https://www.census.gov/programs-surveys/economic-census.html
5. U.S. Census Bureau, County Business Patterns 2023 (NAICS 336320): 574 establishments, 60,662 employees, ~$3.72B annual payroll. https://www.census.gov/programs-surveys/cbp.html
6. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 336320: 1,000 employees), 2023. https://www.sba.gov/document/support-table-size-standards
7. U.S. Bureau of Labor Statistics, Industry Productivity data via FRED (NAICS 336320: ~57,700 jobs, 2025). https://fred.stlouisfed.org/series/IPUEN336320W200000000
8. P&S Market Research, "U.S. Automobile Electronics Market Size and Growth Report" (~$62.4B in 2024), 2025. https://www.psmarketresearch.com/market-analysis/us-automobile-electronics-market
9. Tetakawi, "The Future of Wire Harness Manufacturing in Mexico" (labor intensity; ~150 lbs of wiring per vehicle; ~70% lower labor cost), 2024. https://insights.tetakawi.com/the-future-of-wire-harness-manufacturing-in-mexico
10. Aptiv PLC, 2025 Annual Report (revenue $20.4B, 12.1% adjusted operating margin; top 10 customers ~56% of sales). https://www.sec.gov/Archives/edgar/data/1521332/000152133226000031/aptv12312025arsa.pdf
11. TradingView / SEC filings, "Aptiv Announces Spin-Off of Electrical Distribution Systems (Versigent, NYSE: VGNT), completed April 1, 2026," 2026. https://www.tradingview.com/news/tradingview:84c3760b4aac4:0-aptiv-plc-announces-spin-off-of-electrical-distribution-systems/
12. Gentex Corporation, 2025 Form 10-K (top 3 customers 18%, 11%, 10% of sales; 110 bps gross margin impact from unrecovered tariffs). https://www.sec.gov/Archives/edgar/data/355811/000035581126000010/gntx-20251231.htm
13. Robert Bosch GmbH, Ownership Structure (~94% of share capital held by Robert Bosch Stiftung). https://www.bosch.com/company/
14. Visteon Corporation, 2025 Results (sales $3.768B; 11.6% Q4 adj. EBITDA margin; $6.1B new business wins in 2024). https://www.sec.gov/Archives/edgar/data/1111335/000111133526000005/visteonq42025pr.htm
15. National Automobile Dealers Association, December 2025 Market Beat (16.2 million U.S. light-vehicle sales in 2025). https://www.nada.org/nada/nada-headlines/december-2025-market-beat-new-light-vehicle-sales-totaled-162-million-units
16. Roland Berger / Lazard, "Global Automotive Supplier Study: average industry EBIT margin ~4.7%," 2024. https://www.rolandberger.com/en/Media/Global-Automotive-Supplier-Study-Average-industry-profit-margin-drops-to-just.html
17. Lear Corporation, 2025 Form 10-K (E-Systems segment $5.976B sales, 3.1% segment margin vs. 4.1% prior year; contract structure, price-downs, tariff-recovery margin dilution). https://www.sec.gov/Archives/edgar/data/842162/000084216226000011/lear-20251231.htm
18. Gentex Corporation, 2025 Results (34.7% gross margin), 2026. https://www.sec.gov/Archives/edgar/data/355811/000035581126000005/exhibit99112312025.htm
19. International Energy Agency, Global EV Outlook 2026 (~1.5M U.S. EV sales in 2025, ~10% of market; 20M+ global EV sales, ~25% of market). https://www.iea.org/reports/global-ev-outlook-2026/trends-in-electric-cars
20. Robert Bosch GmbH, Annual Report 2025 (software-defined vehicles, centralized computing, vehicle E/E architecture transition). https://assets.bosch.com/media/global/bosch_group/our_figures/pdf/bosch-annual-report-2025.pdf
21. National Highway Traffic Safety Administration, "FMVSS No. 127 — Automatic Emergency Braking Systems for Light Vehicles, Final Rule" (compliance targeted Sept. 2029), 2024. https://www.nhtsa.gov/press-releases/nhtsa-fmvss-127-automatic-emergency-braking-reduce-crashes
22. White & Case LLP / U.S. Customs and Border Protection, "Section 232 Tariffs on Automobiles and Automobile Parts (25%), USMCA exemptions and import adjustment offset," 2025. https://www.whitecase.com/insight-alert/commerce-department-opens-new-automobile-parts-section-232-tariff-inclusions-process
23. Bureau of Industry and Security, U.S. Department of Commerce, "Connected-Vehicle Rule" (China/Russia software restrictions MY2027, hardware MY2030; non-model-year hardware Jan 1, 2029). https://www.bis.gov/press-release/commerce-finalizes-rule-secure-connected-vehicle-supply-chains-foreign-adversary-threats