Company lists · Data refreshed September 2026

Top 25 Automotive parts assembly companies based in the United States

Name: Automotive parts assembly companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 1,154 companies tracked

RevenueBase identified 1,154 automotive parts assembly companies headquartered in the United States as of September 2026 and tracks 73,778 professional contacts across them, including 14,950 with verified work emails. Troy is the largest hub.

This list covers automotive parts assembly companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

1,154Companies

73,778Contacts tracked

14,950Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest automotive parts assembly companies based in the United States

Ranked by team size

Top 25 of 1,154 automotive parts assembly companies based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to automotive parts assembly companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	IAC Group	Partial evidence	Southfield, MI, United StatesHQ checked Sep 30, 2026	5,001-10,000	5,634 contacts →
	Partial evidence “Headquartered in Luxembourg, International Automotive Components (IAC) Group is a leading global supplier of automotive components and systems, including instrument panels…” Source: RevenueBase Database · checked Sep 30, 2026
2	Flex-N-Gate	Partial evidence	Urbana, IL, United StatesHQ checked Sep 30, 2026	10001+	4,298 contacts →
	Partial evidence “Starting with aftermarket parts in 1956 and moving into O.E.” Source: RevenueBase Database · checked Sep 30, 2026
3	Inteva Products	Partial evidence	Troy, MI, United StatesHQ checked Sep 30, 2026	5,001-10,000	3,302 contacts →
	Partial evidence “Inteva Products is a leading global automotive supplier known for delivering innovative, reliable, environmentally friendly products that enhance vehicle quality, safety, and…” Source: RevenueBase Database · checked Sep 30, 2026
4	Tower International	Indirect evidence	New Boston, MI, United StatesHQ checked Sep 30, 2026	5,001-10,000	1,774 contacts →
	Indirect evidence “Tower International now AUTOKINITON!” Source: RevenueBase Database · checked Sep 30, 2026
5	Dorman Products	Indirect evidence	Colmar, PA, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,651 contacts →
	Indirect evidence “Dorman was founded on the belief that people should have greater freedom to fix motor vehicles.” Source: RevenueBase Database · checked Sep 30, 2026
6	Standard Motor Products	Strong evidence	Long Island City, NY, United StatesHQ checked Sep 30, 2026	5,001-10,000	1,495 contacts →
	Strong evidence “With over 100 years in business, SMP is a leading independent manufacturer and distributor of premium automotive replacement parts and a provider of custom-engineered solutions…” Source: RevenueBase Database · checked Sep 30, 2026
7	First Brands Group, LLC	Partial evidence	Rochester, MI, United StatesHQ checked Sep 30, 2026	201-500	1,480 contacts →
	Partial evidence “First Brands Group, LLC serves the automotive aftermarket industry with category-leading brands.” Source: RevenueBase Database · checked Sep 30, 2026
8	Toyoda Gosei Americas	Partial evidence	Troy, MI, United StatesHQ checked Sep 30, 2026	10001+	1,419 contacts →
	Partial evidence “Toyoda Gosei is a leading global manufacturer of rubber and plastic automotive components, safety systems and LEDs.” Source: RevenueBase Database · checked Sep 30, 2026
9	Android Industries	Partial evidence	Auburn Hills, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,404 contacts →
	Partial evidence “Voltava was formed in December 2025 through the combination of Detroit Manufacturing Systems, Android Industries and Avancez Assembly.” Source: RevenueBase Database · checked Sep 30, 2026
10	US Farathane	Indirect evidence	Auburn Hills, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,163 contacts →
	Indirect evidence “At US Farathane, we design and manufacture highly engineered plastic injection-molded components, make them available to you in a variety of sizes, shapes, and designs and supply…” Source: RevenueBase Database · checked Sep 30, 2026
11	Summit Polymers	Partial evidence	Portage, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,150 contacts →
	Partial evidence “Summit Polymers is a leading Tier 1 Automotive Supplier of automotive interior systems.” Source: RevenueBase Database · checked Sep 30, 2026
12	MEC Mayville Engineering Company, INC	Indirect evidence	Mayville, WI, United StatesHQ checked Sep 30, 2026	1,001-5,000	906 contacts →
	Indirect evidence “We are more than just a manufacturing and fabricating company.” Source: RevenueBase Database · checked Sep 30, 2026
13	Dakkota Integrated Systems	Indirect evidence	Holt, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	895 contacts →
	Indirect evidence “Dakkota Integrated Systems is a company with world-class products that are designed, engineered, and manufactured by a diverse team of talented employees.” Source: RevenueBase Database · checked Sep 30, 2026
14	Ugn, INC	Indirect evidence	Downers Grove, IL, United StatesHQ checked Sep 30, 2026	1,001-5,000	894 contacts →
	Indirect evidence “Founded in 1986 as a partnership between Nihon Tokushu Toryo Co.” Source: RevenueBase Database · checked Sep 30, 2026
15	Cardone Industries	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 30, 2026	5,001-10,000	885 contacts →
	Strong evidence “CARDONE is a leading global supplier of remanufactured and new automotive parts for passenger cars and light/medium duty trucks.” Source: RevenueBase Database · checked Sep 30, 2026
16	Amsted Automotive	Partial evidence	Geneva, IL, United StatesHQ checked Sep 30, 2026	1,001-5,000	706 contacts →
	Partial evidence “Amsted Automotive was formed in 2021 through the integration of Burgess-Norton, Means Industries, Transform Automotive and SMW Manufacturing.” Source: RevenueBase Database · checked Sep 30, 2026
17	Motus Integrated Technologies	Indirect evidence	Holland, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	684 contacts →
	Indirect evidence “Motus Integrated Technologies is a dynamic, half-billion-dollar global leader in manufacturing high-quality headliners, interior trim, and fiber solution products for the…” Source: RevenueBase Database · checked Sep 30, 2026
18	Lacks Enterprises	Indirect evidence	Kentwood, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	647 contacts →
	Indirect evidence “Lacks Enterprises, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
19	Nexamotion Group	Strong evidence	Cleveland, OH, United StatesHQ checked Sep 30, 2026	1,001-5,000	609 contacts →
	Strong evidence “NexaMotion Group is a dynamic organization in the automotive aftermarket, uniting a diverse family of brands including Transtar Aftermarket Solutions, Arch Auto Parts, C&M Auto…” Source: RevenueBase Database · checked Sep 30, 2026
20	Jvis USA	Partial evidence	Shelby Township, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	602 contacts →
	Partial evidence “When it comes to the world of automotive components, JVIS has continued to be the supplier of choice for leading global brands.” Source: RevenueBase Database · checked Sep 30, 2026
21	Jtekt Automotive North America	Indirect evidence	Greenville, United StatesHQ checked Sep 30, 2026	201-500	539 contacts →
	Indirect evidence “JTEKT Corporation was established in January 2006 through the merger of Koyo Seiko Co, Ltd, a world-class bearing manufacturer, and Toyoda Machine Works, Ltd, a machine tool…” Source: RevenueBase Database · checked Sep 30, 2026
22	Aisin U.S.A. Mfg., INC	Indirect evidence	Seymour, IN, United StatesHQ checked Sep 30, 2026	1,001-5,000	493 contacts →
	Indirect evidence “AISIN U.S.A.” Source: RevenueBase Database · checked Sep 30, 2026
23	Avancez LLC	Partial evidence	Clarkston, MI, United StatesHQ checked Sep 30, 2026	201-500	481 contacts →
	Partial evidence “Voltava was formed in December 2025 through the combination of Detroit Manufacturing Systems, Android Industries and Avancez Assembly.” Source: RevenueBase Database · checked Sep 30, 2026
24	Gill Industries	Partial evidence	Grand Rapids, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	472 contacts →
	Partial evidence “As a global supplier of precision engineered assemblies, we design, engineer and manufacture things that move.” Source: RevenueBase Database · checked Sep 30, 2026
25	Aisin North Carolina Corporation	Indirect evidence	Durham, NC, United StatesHQ checked Sep 30, 2026	1,001-5,000	452 contacts →
	Indirect evidence “On April 1, 2021, AW North Carolina became AISIN North Carolina, part of AISIN Group in the Americas, which includes some employees, 43 manufacturing, sales and R&D Centers.” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: automotive parts assembly companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names automotive parts assembly companies.
Partial evidence: Its own public description names part of automotive parts assembly companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name automotive parts assembly companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,154 automotive parts assembly companies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 14,950 reachable decision-makers.

Free signup · no credit card

View the full list →

Automotive parts assembly companies based in the United States at a glance

As of Sep 30, 2026

20.3%Verified-email coverage

63.9Average contacts per company

11-50Median size (employees)

1.4%Largest-city concentration · Troy

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

343

11-50

319

51-200

227

201-500

109

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,154 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among automotive parts assembly companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “automotive parts assembly companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names automotive parts assembly companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among automotive parts assembly companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 14,950 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names automotive parts assembly companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many automotive parts assembly companies are there based in the United States?

RevenueBase identified 1,154 automotive parts assembly companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

IAC Group, headquartered in Southfield, tops this list with the largest team on record.

Which city has the most automotive parts assembly companies?

Troy leads with 16 headquartered companies, followed by Grand Rapids (14) and Auburn Hills (13).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 14,950 verified decision-maker contacts tracked across these 1,154 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,154 automotive parts assembly companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Automotive parts assembly companies by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.