Company lists · Data refreshed September 2026

Top 25 Independent quality auditors based in the United States

Name: Independent quality auditors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 306 companies tracked

RevenueBase identified 306 independent quality auditors headquartered in the United States as of September 2026 and tracks 18,287 professional contacts across them, including 6,639 with verified work emails. Houston is the largest hub.

This list covers independent quality auditors 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 20, 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 20, 2026 86% judged on-target in blind review

306Companies

18,287Contacts tracked

6,639Verified emails

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The 25 largest independent quality auditors based in the United States

Ranked by team size

Top 25 of 306 independent quality auditors based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to independent quality auditors: 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	UL Solutions	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 20, 2026	10001+	12,316 contacts →
	Indirect evidence “A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110…” Source: RevenueBase Database · checked Sep 20, 2026
2	TÜV Rheinland North America	Indirect evidence	Boxborough, MA, United StatesHQ checked Sep 20, 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 20, 2026
3	Smithers	Indirect evidence	Akron, OH, United StatesHQ checked Sep 20, 2026	501-1,000	310 contacts →
	Indirect evidence “Founded in 1925 and headquartered in Akron, Ohio, Smithers is a multinational provider of testing, consulting, information, and certification services.” Source: RevenueBase Database · checked Sep 20, 2026
4	Intertek Building & Construction	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 20, 2026	10001+	241 contacts →
	Indirect evidence “Market Access.” Source: RevenueBase Database · checked Sep 20, 2026
5	PRO QC International	Partial evidence	Mchenry, IL, United StatesHQ checked Sep 20, 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 20, 2026
6	PRI Performance Review Institute	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 20, 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 20, 2026
7	ANAB	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	199 contacts →
	Partial evidence “The ANSI National Accreditation Board plays an important role in ensuring the safety and quality of goods and services and in protecting the environment.” Source: RevenueBase Database · checked Sep 20, 2026
8	Timber Products Inspection, INC	Partial evidence	Peachtree City, GA, United StatesHQ checked Sep 20, 2026	51-200	134 contacts →
	Partial evidence “Timber Products Inspection, Inc.(TP) is an independent, third party wood products inspection, testing and consulting company.” Source: RevenueBase Database · checked Sep 20, 2026
9	Royalcert International Registrars	Indirect evidence	Watertown, MA, United StatesHQ checked Sep 20, 2026	501-1,000	120 contacts →
	Indirect evidence “RoyalCert is one of the fastest-growing certification bodies, with an international presence in more than 30 countries that is constantly expanding.” Source: RevenueBase Database · checked Sep 20, 2026
10	Aeis LLC	Partial evidence	South Plainfield, NJ, United StatesHQ checked Sep 20, 2026	201-500	116 contacts →
	Partial evidence “AEIS, LLC is a testing, inspection, and certification (TIC) agency that increases quality and safety outcomes for major infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026
11	Certerra	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 20, 2026	1,001-5,000	114 contacts →
	Partial evidence “Certerra provides technology-enabled testing, inspection, and certification services for new product development, engineering solutions to manage assets, and quality assurance for…” Source: RevenueBase Database · checked Sep 20, 2026
12	Intercert INC	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 20, 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 20, 2026
13	Eagle Certification Group	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 20, 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 20, 2026
14	Exemplar Global, INC	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 20, 2026	11-50	80 contacts →
	Indirect evidence “Exemplar Global Inc.(formerly RABQSA) is a not-for-profit organization with shared headquarters in both the United States and Australia.” Source: RevenueBase Database · checked Sep 20, 2026
15	ALS Life Sciences	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	n/a	78 contacts →
	Indirect evidence “ALS is a leading testing, inspection, certification and verification company servicing multiple industries globally.” Source: RevenueBase Database · checked Sep 20, 2026
16	Plexus International	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	51-200	71 contacts →
	Partial 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 20, 2026
17	Alliance Infinite	Partial evidence	New York, United StatesHQ checked Sep 20, 2026	1,001-5,000	48 contacts →
	Partial evidence “Alliance Infinite has consistently maintained its position among the world’s very best quality service providers for Third Party Inspection, Testing, Calibration and Management…” Source: RevenueBase Database · checked Sep 20, 2026
18	BAY Area Compliance Laboratories, Corp	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 20, 2026	11-50	45 contacts →
	Indirect evidence “Since 1996, Bay Area Compliance Laboratories Corp.” Source: RevenueBase Database · checked Sep 20, 2026
19	F2 Labs	Indirect evidence	Damascus, MD, United StatesHQ checked Sep 20, 2026	11-50	43 contacts →
	Indirect evidence “F2 Labs is an accredited, full service product conformity assessment organization founded in 1991.” Source: RevenueBase Database · checked Sep 20, 2026
20	Quality Auditing LLC	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	11-50	43 contacts →
	Partial 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 20, 2026
21	ABS Quality Evaluations	Partial evidence	Spring, TX, United StatesHQ checked Sep 20, 2026	n/a	41 contacts →
	Partial 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 20, 2026
22	Drummond Group, LLC	Indirect evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	11-50	40 contacts →
	Indirect evidence “Drummond is a leading and trusted compliance, conformance, and standards certification, testing, and validation services provider.” Source: RevenueBase Database · checked Sep 20, 2026
23	Intertek Acumen Security	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	51-200	40 contacts →
	Indirect evidence “We established Acumen to change how product certifications are performed.” Source: RevenueBase Database · checked Sep 20, 2026
24	Supplier Inspection Services, INC	Partial evidence	Moraine, OH, United StatesHQ checked Sep 20, 2026	51-200	34 contacts →
	Partial 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 20, 2026
25	SQF Institute	Partial evidence	Arlington, VA, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “The SQF (Safe Quality Food) Institute is a division of the FMI, the food industry association, established to administer the SQF Program, a leading, global food safety and quality…” Source: RevenueBase Database · checked Sep 20, 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: independent quality auditors. 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 independent quality auditors.
Partial evidence: Its own public description names part of independent quality auditors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name independent quality auditors. 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 306 independent quality auditors based in the United States

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Independent quality auditors based in the United States at a glance

As of Sep 20, 2026

36.3%Verified-email coverage

59.8Average contacts per company

11-50Median size (employees)

5.2%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

149

11-50

51-200

201-500

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 306 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 independent quality auditors, 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 “independent quality auditors”. 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 independent quality auditors), 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 independent quality auditors, 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, 6,639 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 20, 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 independent quality auditors, 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 independent quality auditors are there based in the United States?

RevenueBase identified 306 independent quality auditors 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?

UL Solutions, headquartered in Northbrook, tops this list with the largest team on record.

Which city has the most independent quality auditors?

Houston leads with 16 headquartered companies, followed by Miami (7) and Denver (5).

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 6,639 verified decision-maker contacts tracked across these 306 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 20, 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.