Company lists · Data refreshed September 2026

Top 25 Automotive quality assurance services based in the United States

Name: Automotive quality assurance services 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 162 companies tracked

RevenueBase identified 162 automotive quality assurance services headquartered in the United States as of September 2026 and tracks 6,491 professional contacts across them, including 1,152 with verified work emails. Los Angeles is the largest hub.

This list covers automotive quality assurance services 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

162Companies

6,491Contacts tracked

1,152Verified emails

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The 25 largest automotive quality assurance services based in the United States

Ranked by team size

Top 25 of 162 automotive quality assurance services 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 quality assurance services: 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	Stratosphere Quality	Strong evidence	Fishers, IN, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,553 contacts →
	Strong evidence “Stratosphere Quality, founded in 2009, is a major global provider of quality assurance and outsourcing solutions, such as sorting and inspection services, to manufacturers of…” Source: RevenueBase Database · checked Sep 30, 2026
2	TÜV Rheinland North America	Indirect evidence	Boxborough, MA, United StatesHQ checked Sep 30, 2026	501-1,000	712 contacts →
	Indirect evidence “TÜV Rheinland is a world leader in testing, inspection and certification services for a wide variety of industries.” Source: RevenueBase Database · checked Sep 30, 2026
3	Vayan Group, LLC	Strong evidence	Sterling Heights, MI, United StatesHQ checked Sep 30, 2026	1,001-5,000	476 contacts →
	Strong evidence “Vayan Group, LLC is a leading provider of technology-driven quality assurance solutions for OEMs, Tier 1 and Tier 2 suppliers across the automotive, aerospace, electronics…” Source: RevenueBase Database · checked Sep 30, 2026
4	ILAB	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 30, 2026	501-1,000	417 contacts →
	Strong evidence “iLAB specializes in Software Quality Assurance services, providing global solutions to our customers.” Source: RevenueBase Database · checked Sep 30, 2026
5	Kett Engineering Corporation	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 30, 2026	501-1,000	250 contacts →
	Partial evidence “Kett Engineering Corporation has been operating for over 60 years and has spent the past 28 years dedicating its services to supporting the automotive testing and staffing needs…” Source: RevenueBase Database · checked Sep 30, 2026
6	MGA Research Corporation	Indirect evidence	Akron, NY, United StatesHQ checked Sep 30, 2026	201-500	224 contacts →
	Indirect evidence “MGA is recognized worldwide as one of the leading independent providers of testing services and equipment.” Source: RevenueBase Database · checked Sep 30, 2026
7	PRO QC International	Partial evidence	Mchenry, IL, United StatesHQ checked Sep 30, 2026	501-1,000	211 contacts →
	Partial evidence “Pro QC International provides tailored quality solutions with a human touch in 100 countries.” Source: RevenueBase Database · checked Sep 30, 2026
8	PRI Performance Review Institute	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 30, 2026	51-200	200 contacts →
	Indirect evidence “Performance Review Institute® (PRI℠) is headquartered in Pittsburgh, Pennsylvania in the USA, with offices in London, UK to serve Europe and in Beijing, China and Aichi, Japan…” Source: RevenueBase Database · checked Sep 30, 2026
9	Team Quality Services	Indirect evidence	Auburn, IN, United StatesHQ checked Sep 30, 2026	201-500	132 contacts →
	Indirect evidence “We're there, so our customers don’t have to be.” Source: RevenueBase Database · checked Sep 30, 2026
10	Thought Frameworks	Indirect evidence	Covina, CA, United StatesHQ checked Sep 30, 2026	51-200	95 contacts →
	Indirect evidence “From Global QA and QC Partners to Full Fledged Digital Transformation Organization, We've got you covered!” Source: RevenueBase Database · checked Sep 30, 2026
11	Sustained Quality	Strong evidence	South Bend, IN, United StatesHQ checked Sep 30, 2026	51-200	83 contacts →
	Strong evidence “Sustained Quality has been a trusted partner in quality since 2007, delivering inspection, sorting, rework/repair, engineering, and containment services to the automotive…” Source: RevenueBase Database · checked Sep 30, 2026
12	TRP Laboratories	Indirect evidence	Troy, MI, United StatesHQ checked Sep 30, 2026	51-200	70 contacts →
	Indirect evidence “TRP Laboratories provides standard and custom testing services across the United States.” Source: RevenueBase Database · checked Sep 30, 2026
13	ZT Automotive	Partial evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	201-500	63 contacts →
	Partial evidence “ZT Automotive is a leading automotive group committed to delivering excellence through Integrity, Growth, Innovation, and Consistency.” Source: RevenueBase Database · checked Sep 30, 2026
14	BAY Area Compliance Laboratories, Corp	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 30, 2026	11-50	45 contacts →
	Indirect evidence “Since 1996, Bay Area Compliance Laboratories Corp.” Source: RevenueBase Database · checked Sep 30, 2026
15	ABS Quality Evaluations	Strong evidence	Spring, TX, United StatesHQ checked Sep 30, 2026	n/a	41 contacts →
	Strong evidence “ABS Quality Evaluations, Inc.(ABS QE) is a global leader in quality assurance and business improvement services with over 30 years of experience.” Source: RevenueBase Database · checked Sep 30, 2026
16	ISS Vertical Quality Solutions	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 30, 2026	51-200	41 contacts →
	Partial evidence “We believe in quality without compromise, and resolve quality issues more efficiently, and accurately, by holding ourselves to a documented, higher standard.” Source: RevenueBase Database · checked Sep 30, 2026
17	Botgauge AI	Indirect evidence	Dover, DE, United StatesHQ checked Sep 30, 2026	11-50	25 contacts →
	Indirect evidence “BotGauge AI is a fully managed Autonomous testing partner for modern software teams.” Source: RevenueBase Database · checked Sep 30, 2026
18	Fifth Gear Automotive	Partial evidence	Lewisville, TX, United StatesHQ checked Sep 30, 2026	11-50	24 contacts →
	Partial evidence “Fifth Gear Automotive is a family-owned independent auto repair organization with a focus on European, Asian and domestic vehicles with facilities located in Lewisville and…” Source: RevenueBase Database · checked Sep 30, 2026
19	Primeqa Solutions	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 30, 2026	51-200	23 contacts →
	Strong evidence “PrimeQA, a proud member of NASSCOM and recognized by Startup India, is one of the global leaders in Quality Assurance and Testing.” Source: RevenueBase Database · checked Sep 30, 2026
20	International Quality Control, INC	Strong evidence	Allen Park, MI, United StatesHQ checked Sep 30, 2026	51-200	23 contacts →
	Strong evidence “International Quality Control started out in 1998 and since has grown in both domestic and global markets to help serve the Automotive Industry’s quality needs.” Source: RevenueBase Database · checked Sep 30, 2026
21	Valtec, LLC	Partial evidence	Imlay City, MI, United StatesHQ checked Sep 30, 2026	51-200	22 contacts →
	Partial evidence “VALTEC, LLC is an automotive company based out of Imlay City, MI.” Source: RevenueBase Database · checked Sep 30, 2026
22	AZ Quality	Partial evidence	Gilbert, AZ, United StatesHQ checked Sep 30, 2026	51-200	21 contacts →
	Partial evidence “AZ Quality is a provider of quality-related "professional services" and "consulting services," such as Quality Engineers, Quality Technicians, Customer Quality Liaisons, Auditors…” Source: RevenueBase Database · checked Sep 30, 2026
23	Quality Service Group, LLC	Strong evidence	Sparta, TN, United StatesHQ checked Sep 30, 2026	51-200	20 contacts →
	Strong evidence “Quality Service Group was formed in 2001 by automotive professionals who know what it means to provide a solid and reliable support system of integrated services.” Source: RevenueBase Database · checked Sep 30, 2026
24	North American Assembly	Partial evidence	Auburn Hills, MI, United StatesHQ checked Sep 30, 2026	51-200	20 contacts →
	Partial evidence “North American Assembly is an Automotive company located in 4325 Giddings Road, Auburn Hills MI 48326 United States.” Source: RevenueBase Database · checked Sep 30, 2026
25	QS Automotive	Indirect evidence	Birmingham, TN, United StatesHQ checked Sep 30, 2026	51-200	17 contacts →
	Indirect evidence “Delivering results on time, every time.” 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 quality assurance services. 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 quality assurance services.
Partial evidence: Its own public description names part of automotive quality assurance services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name automotive quality assurance services. 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 162 automotive quality assurance services based in the United States

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Automotive quality assurance services based in the United States at a glance

As of Sep 30, 2026

17.7%Verified-email coverage

40.1Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · Los Angeles

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 162 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 quality assurance services, 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 quality assurance services”. 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 quality assurance services), 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 quality assurance services, 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, 1,152 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 quality assurance services, 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 quality assurance services are there based in the United States?

RevenueBase identified 162 automotive quality assurance services 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?

Stratosphere Quality, headquartered in Fishers, tops this list with the largest team on record.

Which city has the most automotive quality assurance services?

Los Angeles leads with 6 headquartered companies, followed by Houston (4) and Indianapolis (3).

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 1,152 verified decision-maker contacts tracked across these 162 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.

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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.