Company lists · Data refreshed September 2026

Top 25 Supplier audit companies based in the United States

Name: Supplier audit 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 22, 2026 129 companies tracked

RevenueBase identified 129 supplier audit companies headquartered in the United States as of September 2026 and tracks 16,777 professional contacts across them, including 6,191 with verified work emails. Houston is the largest hub.

This list covers supplier audit 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 22, 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 22, 2026 86% judged on-target in blind review

129Companies

16,777Contacts tracked

6,191Verified emails

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The 25 largest supplier audit companies based in the United States

Ranked by team size

Top 25 of 129 supplier audit companies based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to supplier audit 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	UL Solutions	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 22, 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 22, 2026
2	TÜV Rheinland North America	Indirect evidence	Boxborough, MA, United StatesHQ checked Sep 22, 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 22, 2026
3	SCS Global Services	Indirect evidence	Emeryville, CA, United StatesHQ checked Sep 22, 2026	201-500	667 contacts →
	Indirect evidence “Scientific Certification Systems, Inc, now doing business as SCS Global Services, is a trusted leader in third-party environmental, sustainability and food quality certification…” Source: RevenueBase Database · checked Sep 22, 2026
4	NSF	Indirect evidence	Ann Arbor, MI, United StatesHQ checked Sep 22, 2026	501-1,000	390 contacts →
	Indirect evidence “NSF is the leading global certifier of Global Food Safety Initiative (GFSI) benchmarked certifications.” Source: RevenueBase Database · checked Sep 22, 2026
5	PRO QC International	Indirect evidence	Mchenry, IL, United StatesHQ checked Sep 22, 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 22, 2026
6	Royalcert International Registrars	Indirect evidence	Watertown, MA, United StatesHQ checked Sep 22, 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 22, 2026
7	Stratosphere Quality LLC	Indirect evidence	Frankfort, IN, United StatesHQ checked Sep 22, 2026	11-50	85 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
8	BSI Consulting	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	84 contacts →
	Indirect evidence “BSI Consulting offers comprehensive world-class solutions in environmental, health, safety (EHS), supply chain security, and sustainability.” Source: RevenueBase Database · checked Sep 22, 2026
9	Eagle Certification Group	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 22, 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 22, 2026
10	PRI Certification	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 22, 2026	11-50	78 contacts →
	Indirect evidence “At PRI Certification℠, we're committed to protecting what matters by delivering industry-leading certification services across Quality, Data Security, Environmental, and Health &…” Source: RevenueBase Database · checked Sep 22, 2026
11	Primus Auditing OPS	Indirect evidence	Santa Maria, CA, United StatesHQ checked Sep 22, 2026	51-200	56 contacts →
	Indirect evidence “Overview: Headquartered in Santa Maria, CA, Primus Auditing Ops provides the fresh produce industry with specialized services related to the safe production and handling of…” Source: RevenueBase Database · checked Sep 22, 2026
12	BAY Area Compliance Laboratories, Corp	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 22, 2026	11-50	45 contacts →
	Indirect evidence “Since 1996, Bay Area Compliance Laboratories Corp.” Source: RevenueBase Database · checked Sep 22, 2026
13	ABS Quality Evaluations	Indirect evidence	Spring, TX, United StatesHQ checked Sep 22, 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 22, 2026
14	Drummond Group, LLC	Indirect evidence	Durham, NC, United StatesHQ checked Sep 22, 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 22, 2026
15	Association Of Professional Social Compliance Auditors Inc. Apsca	Partial evidence	Washington, United StatesHQ checked Sep 22, 2026	11-50	34 contacts →
	Partial evidence “APSCA was created to enhance the professionalism, consistency and credibility of individual auditors and organizations performing independent social compliance audits, and to…” Source: RevenueBase Database · checked Sep 22, 2026
16	International Compliance Group	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 22, 2026	11-50	34 contacts →
	Indirect evidence “International Compliance Group is a privately-held US-based organization focused on social compliance.” Source: RevenueBase Database · checked Sep 22, 2026
17	SQF Institute	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect 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 22, 2026
18	Transparency-One	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 22, 2026	501-1,000	24 contacts →
	Indirect evidence “Transparency-One is a complete platform helping global businesses meet consumer demand for safe, sustainable, and responsibly sourced products.” Source: RevenueBase Database · checked Sep 22, 2026
19	GCS Certification	Indirect evidence	Salt Lake City, United StatesHQ checked Sep 22, 2026	51-200	23 contacts →
	Indirect evidence “A GCS Certificadora Brasil é uma empresa do Grupo GCS Certification® que atua no universo das certificações internacionais e possui autonomia para desenvolvimento e atuação em…” Source: RevenueBase Database · checked Sep 22, 2026
20	Pdca International LTD	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 22, 2026	11-50	22 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
21	India Index	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	21 contacts →
	Indirect evidence “No more complicated classifieds or cold calls.” Source: RevenueBase Database · checked Sep 22, 2026
22	Vendor Control Service, INC	Indirect evidence	Concord, MA, United StatesHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “Since 1986, the Vendor Control Service, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
23	Earthclaims LLC	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “EarthClaims LLC provides private, third-party verification services to clients worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
24	SGS Group Management LTD	Indirect evidence	Fairfield, NJ, United StatesHQ checked Sep 22, 2026	11-50	16 contacts →
	Indirect evidence “SGS is the world's leading inspection, verification, testing and certification company.” Source: RevenueBase Database · checked Sep 22, 2026
25	Insite Compliance LLC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 22, 2026	11-50	13 contacts →
	Indirect evidence “Insite is committed to upholding the fundamental principles of human and workplace rights worldwide, and to playing a pivotal role in the advancement of social compliance.” Source: RevenueBase Database · checked Sep 22, 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: supplier audit 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 supplier audit companies.
Partial evidence: Its own public description names part of supplier audit companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name supplier audit 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 129 supplier audit companies based in the United States

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Supplier audit companies based in the United States at a glance

As of Sep 22, 2026

36.9%Verified-email coverage

130.1Average contacts per company

11-50Median size (employees)

5.4%Largest-city concentration · Houston

Sep 22, 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

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 129 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 supplier audit 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 “supplier audit 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 supplier audit 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 supplier audit 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, 6,191 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 22, 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 supplier audit 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 supplier audit companies are there based in the United States?

RevenueBase identified 129 supplier audit 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?

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

Which city has the most supplier audit companies?

Houston leads with 7 headquartered companies, followed by Warrendale (5) and New York (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 6,191 verified decision-maker contacts tracked across these 129 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 22, 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.