Company lists · Data refreshed September 2026

Top 25 Automotive aerospace audit firms based in the United States

Name: Automotive aerospace audit firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 383 companies tracked

RevenueBase identified 383 automotive aerospace audit firms headquartered in the United States as of September 2026 and tracks 5,985 professional contacts across them, including 1,271 with verified work emails. Houston is the largest hub.

This list covers automotive aerospace audit firms 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 21, 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 21, 2026 86% judged on-target in blind review

383Companies

5,985Contacts tracked

1,271Verified emails

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The 25 largest automotive aerospace audit firms based in the United States

Ranked by team size

Top 25 of 383 automotive aerospace audit firms based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to automotive aerospace audit firms: 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	Indirect evidence	Fishers, IN, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,553 contacts →
	Indirect 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 21, 2026
2	Vayan Group, LLC	Strong evidence	Sterling Heights, MI, United StatesHQ checked Sep 21, 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 21, 2026
3	Kett Engineering Corporation	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 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 21, 2026
4	Amci Global	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	201-500	242 contacts →
	Partial evidence “AMCI is an automotive marketing consulting firm made up of automotive experts and enthusiasts.” Source: RevenueBase Database · checked Sep 21, 2026
5	PRO QC International	Indirect evidence	Mchenry, IL, United StatesHQ checked Sep 21, 2026	501-1,000	211 contacts →
	Indirect evidence “Pro QC International provides tailored quality solutions with a human touch in 100 countries.” Source: RevenueBase Database · checked Sep 21, 2026
6	Team Quality Services	Indirect evidence	Auburn, IN, United StatesHQ checked Sep 21, 2026	201-500	132 contacts →
	Indirect evidence “We're there, so our customers don’t have to be.” Source: RevenueBase Database · checked Sep 21, 2026
7	Redi-Group North America, LLC	Indirect evidence	Greenville, SC, United StatesHQ checked Sep 21, 2026	501-1,000	110 contacts →
	Indirect evidence “Our family-owned company, founded in 1996, has grown continuously.” Source: RevenueBase Database · checked Sep 21, 2026
8	Intercert INC	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 21, 2026	51-200	85 contacts →
	Indirect evidence “INTERCERT is a multinational auditing company headquartered in Texas, United States operating at 28+ countries.” Source: RevenueBase Database · checked Sep 21, 2026
9	Sustained Quality	Partial evidence	South Bend, IN, United StatesHQ checked Sep 21, 2026	51-200	83 contacts →
	Partial 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 21, 2026
10	Eagle Certification Group	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 21, 2026	11-50	80 contacts →
	Indirect evidence “Since 1994, EAGLE has built an excellent reputation by providing third party auditing services that are objective and value-added.” Source: RevenueBase Database · checked Sep 21, 2026
11	Select Industries Corp	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 21, 2026	51-200	77 contacts →
	Indirect evidence “With over fifty years of experience, Select provides quality components and assemblies meeting the requirements of the largest industry manufacturers.” Source: RevenueBase Database · checked Sep 21, 2026
12	Martin Technologies	Indirect evidence	New Hudson, MI, United StatesHQ checked Sep 21, 2026	501-1,000	73 contacts →
	Indirect evidence “MARTIN Technologies is a proven leader in advanced engineering solutions for global transportation including Engineering, Testing, Manufacturing, and Motorsports.” Source: RevenueBase Database · checked Sep 21, 2026
13	Plexus International	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	51-200	71 contacts →
	Indirect evidence “Plexus International is a global leader in providing training, assessment, and consulting services for organizations to attain quality management systems excellence.” Source: RevenueBase Database · checked Sep 21, 2026
14	Dealer Solutions, Inc. DSI	Partial evidence	New Port Richey, FL, United StatesHQ checked Sep 21, 2026	201-500	58 contacts →
	Partial evidence “DSI's talented team of Automotive Parts Professionals performed over 1,500 parts inventories – over $600 MILLION in parts inventory will be audited in 2022 alone!” Source: RevenueBase Database · checked Sep 21, 2026
15	Design Research Engineering	Indirect evidence	Novi, United StatesHQ checked Sep 21, 2026	11-50	56 contacts →
	Indirect evidence “Engineering Consulting Services” Source: RevenueBase Database · checked Sep 21, 2026
16	EBZ Systec, INC	Partial evidence	Mccalla, AL, United StatesHQ checked Sep 21, 2026	51-200	53 contacts →
	Partial evidence “EBZ is one of the top suppliers to the automotive industry.” Source: RevenueBase Database · checked Sep 21, 2026
17	Axeon Corporation	Indirect evidence	Draper, UT, United StatesHQ checked Sep 21, 2026	11-50	46 contacts →
	Indirect evidence “The Axeon Difference Axeon Corporation is a customer-focused, practical and approachable, technically sound training and consulting firm.” Source: RevenueBase Database · checked Sep 21, 2026
18	Quality Auditing LLC	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	11-50	43 contacts →
	Indirect evidence “Quality Auditing LLC is the industry leader in Quality Management System Auditing & Consulting for clients in highly-regulated industries, including Medical Device…” Source: RevenueBase Database · checked Sep 21, 2026
19	ABS Quality Evaluations	Indirect evidence	Spring, TX, United StatesHQ checked Sep 21, 2026	n/a	41 contacts →
	Indirect 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 21, 2026
20	Hummingbird Teksystems, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	39 contacts →
	Indirect evidence “Overview: Hummingbird TekSystem, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
21	Supplier Inspection Services, INC	Strong evidence	Moraine, OH, United StatesHQ checked Sep 21, 2026	51-200	34 contacts →
	Strong evidence “Supplier Inspection Services, Inc.(SIS, Inc.) is a quality management support services provider that partners with companies worldwide within the Automotive, Aerospace, Appliance…” Source: RevenueBase Database · checked Sep 21, 2026
22	The ISO 9001 Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	11-50	29 contacts →
	Indirect evidence “The ISO 9001 Group is a full-service business and management system consulting, auditing and training firm based in Houston, Texas.” Source: RevenueBase Database · checked Sep 21, 2026
23	Encona	Indirect evidence	Lawrenceburg, TN, United StatesHQ checked Sep 21, 2026	11-50	27 contacts →
	Indirect evidence “Over 500 companies in more than 40 countries trust ENCONA’s professional services.” Source: RevenueBase Database · checked Sep 21, 2026
24	Tiec, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	51-200	26 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
25	Fifth Gear Automotive	Partial evidence	Lewisville, TX, United StatesHQ checked Sep 21, 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 21, 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 aerospace audit firms. 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 aerospace audit firms.
Partial evidence: Its own public description names part of automotive aerospace audit firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name automotive aerospace audit firms. 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 383 automotive aerospace audit firms based in the United States

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Automotive aerospace audit firms based in the United States at a glance

As of Sep 21, 2026

21.2%Verified-email coverage

15.6Average contacts per company

1-10Median size (employees)

4.7%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

244

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 383 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 aerospace audit firms, 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 aerospace audit firms”. 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 aerospace audit firms), 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 aerospace audit firms, 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, 1,271 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 21, 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 aerospace audit firms, 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 aerospace audit firms are there based in the United States?

RevenueBase identified 383 automotive aerospace audit firms 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 aerospace audit firms?

Houston leads with 18 headquartered companies, followed by Los Angeles (9) and New York (9).

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 1,271 verified decision-maker contacts tracked across these 383 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 21, 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.