Company lists · Data refreshed September 2026

Top 25 Field audit services based in the United States

Name: Field audit 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 28, 2026 327 companies tracked

RevenueBase identified 327 field audit services headquartered in the United States as of September 2026 and tracks 20,571 professional contacts across them, including 7,294 with verified work emails. Houston is the largest hub.

This list covers field audit 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 28, 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 28, 2026 86% judged on-target in blind review

327Companies

20,571Contacts tracked

7,294Verified emails

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The 25 largest field audit services based in the United States

Ranked by team size

Top 25 of 327 field audit services based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to field audit 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	UL Solutions	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 28, 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 28, 2026
2	Stratosphere Quality	Indirect evidence	Fishers, IN, United StatesHQ checked Sep 28, 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 28, 2026
3	Applied Technical Services, LLC	Indirect evidence	Marietta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	890 contacts →
	Indirect evidence “Applied Technical Services assists commercial and industrial clients by providing inspection, testing, consulting engineering, and calibration services.” Source: RevenueBase Database · checked Sep 28, 2026
4	TÜV Rheinland North America	Indirect evidence	Boxborough, MA, United StatesHQ checked Sep 28, 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 28, 2026
5	Quiktrak, LLC	Indirect evidence	Beaverton, OR, United StatesHQ checked Sep 28, 2026	201-500	281 contacts →
	Indirect evidence “Quiktrak is a leading provider of inspection and verification services to the global finance industry.” Source: RevenueBase Database · checked Sep 28, 2026
6	Intertek Building & Construction	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 28, 2026	10001+	241 contacts →
	Indirect evidence “Market Access.” Source: RevenueBase Database · checked Sep 28, 2026
7	PRO QC International	Indirect evidence	Mchenry, IL, United StatesHQ checked Sep 28, 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 28, 2026
8	Qualspec	Indirect evidence	Deer Park, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	149 contacts →
	Indirect evidence “QualSpec is a leading industrial inspection firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 28, 2026
9	Timber Products Inspection, INC	Indirect evidence	Peachtree City, GA, United StatesHQ checked Sep 28, 2026	51-200	134 contacts →
	Indirect evidence “Timber Products Inspection, Inc.(TP) is an independent, third party wood products inspection, testing and consulting company.” Source: RevenueBase Database · checked Sep 28, 2026
10	Team Quality Services	Indirect evidence	Auburn, IN, United StatesHQ checked Sep 28, 2026	201-500	132 contacts →
	Indirect evidence “We're there, so our customers don’t have to be.” Source: RevenueBase Database · checked Sep 28, 2026
11	CGI Coastal Gulf & International	Indirect evidence	Saint Rose, LA, United StatesHQ checked Sep 28, 2026	201-500	130 contacts →
	Indirect evidence “Since 1978, Coastal Gulf & International, Inc.(CGI) has been a trusted leader in independent inspection, testing, and technical services for the energy, petrochemical, and marine…” Source: RevenueBase Database · checked Sep 28, 2026
12	Royalcert International Registrars	Indirect evidence	Watertown, MA, United StatesHQ checked Sep 28, 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 28, 2026
13	Aeis LLC	Indirect evidence	South Plainfield, NJ, United StatesHQ checked Sep 28, 2026	201-500	116 contacts →
	Indirect 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 28, 2026
14	Intercert INC	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 28, 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 28, 2026
15	Eagle Certification Group	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 28, 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 28, 2026
16	PRI Certification	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 28, 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 28, 2026
17	ALS Life Sciences	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 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 28, 2026
18	Redocs INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	57 contacts →
	Indirect evidence “Redocs, a well-known and respected compliance company in the New York City Commercial Property industry.” Source: RevenueBase Database · checked Sep 28, 2026
19	Primus Auditing OPS	Indirect evidence	Santa Maria, CA, United StatesHQ checked Sep 28, 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 28, 2026
20	T.P. Engineering, INC	Indirect evidence	Trussville, AL, United StatesHQ checked Sep 28, 2026	n/a	55 contacts →
	Indirect evidence “T.P.” Source: RevenueBase Database · checked Sep 28, 2026
21	ASPEN	Indirect evidence	Draper, UT, United StatesHQ checked Sep 28, 2026	51-200	49 contacts →
	Indirect evidence “Aspen originated in the mountains of Aspen, Colorado.” Source: RevenueBase Database · checked Sep 28, 2026
22	Alliance Infinite	Indirect evidence	New York, United StatesHQ checked Sep 28, 2026	1,001-5,000	48 contacts →
	Indirect 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 28, 2026
23	True Inspection Services	Indirect evidence	Urbana, OH, United StatesHQ checked Sep 28, 2026	51-200	46 contacts →
	Indirect evidence “True Inspection Services (TIS) is a full-service commercial inspection company in the state of Ohio providing construction inspection services on commercial, government, aviation…” Source: RevenueBase Database · checked Sep 28, 2026
24	BAY Area Compliance Laboratories, Corp	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	11-50	45 contacts →
	Indirect evidence “Since 1996, Bay Area Compliance Laboratories Corp.” Source: RevenueBase Database · checked Sep 28, 2026
25	Quality Auditing LLC	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 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 28, 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: field audit 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 field audit services.
Partial evidence: Its own public description names part of field audit services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name field audit 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 327 field audit services based in the United States

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Field audit services based in the United States at a glance

As of Sep 28, 2026

35.5%Verified-email coverage

62.9Average contacts per company

11-50Median size (employees)

6.7%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

150

11-50

103

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 327 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 field audit 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 “field audit 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 field audit 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 field audit 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, 7,294 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 28, 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 field audit 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 field audit services are there based in the United States?

RevenueBase identified 327 field audit 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?

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

Which city has the most field audit services?

Houston leads with 22 headquartered companies, followed by New York (10) and Miami (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 7,294 verified decision-maker contacts tracked across these 327 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 28, 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.