Company lists · Data refreshed September 2026

Top 25 Testing companies based in the United States

Name: Testing 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 21, 2026 1,085 companies tracked

RevenueBase identified 1,085 testing companies headquartered in the United States as of September 2026 and tracks 59,253 professional contacts across them, including 21,123 with verified work emails. Houston is the largest hub.

This list covers testing 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 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

1,085Companies

59,253Contacts tracked

21,123Verified emails

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The 25 largest testing companies based in the United States

Ranked by team size

Top 25 of 1,085 testing companies 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 testing 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 21, 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 21, 2026
2	NI National Instruments	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	5,001-10,000	7,081 contacts →
	Indirect evidence “In 2023, Emerson acquired NI and introduced its new Test & Measurement business group.” Source: RevenueBase Database · checked Sep 21, 2026
3	Amspec Group	Strong evidence	Cranbury, NJ, United StatesHQ checked Sep 21, 2026	5,001-10,000	3,447 contacts →
	Strong evidence “The AmSpec Group has been relied upon in the testing, inspection, and certification (TIC) sector for several decades.” Source: RevenueBase Database · checked Sep 21, 2026
4	Nv5	Indirect evidence	Hollywood, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,230 contacts →
	Indirect evidence “NV5 is a provider of technology, conformity assessment, and consulting solutions for public and private sector clients supporting infrastructure, utility, and building assets and…” Source: RevenueBase Database · checked Sep 21, 2026
5	Pace Analytical Services	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,228 contacts →
	Indirect evidence “Pace® Science and Technology Company makes the world a safer, healthier place.” Source: RevenueBase Database · checked Sep 21, 2026
6	Eurofins Lancaster Laboratories	Indirect evidence	Lancaster, PA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,638 contacts →
	Indirect evidence “Eurofins Lancaster Laboratories is one of the largest commercial contract laboratories in the world providing comprehensive laboratory services in the pharmaceutical…” Source: RevenueBase Database · checked Sep 21, 2026
7	Gaming Laboratories International, LLC	Indirect evidence	Lakewood, NJ, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,093 contacts →
	Indirect evidence “Illuminate Your Path with a Wonderful Career at Visit gaminglabs.com/careers for great career opportunities!” Source: RevenueBase Database · checked Sep 21, 2026
8	PSI Services LLC	Strong evidence	Olathe, KS, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,022 contacts →
	Strong evidence “PSI has over 70 years of experience providing worldwide testing solutions to corporations, federal and state government agencies, professional associations, certifying bodies and…” Source: RevenueBase Database · checked Sep 21, 2026
9	A1qa	Strong evidence	Decatur, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	980 contacts →
	Strong evidence “a1qa is a global software testing and QA outsourcing company trusted by IT firms and Fortune 500 enterprises to deliver software quality that holds under real-world pressure.” Source: RevenueBase Database · checked Sep 21, 2026
10	Applied Technical Services, LLC	Strong evidence	Marietta, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	890 contacts →
	Strong evidence “Applied Technical Services assists commercial and industrial clients by providing inspection, testing, consulting engineering, and calibration services.” Source: RevenueBase Database · checked Sep 21, 2026
11	Professional Service Industries, Inc. PSI	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	778 contacts →
	Indirect evidence “Intertek, a leading provider of quality solutions to industries around the world, has completed the acquisition of Professional Service Industries, Inc.(PSI), a leading…” Source: RevenueBase Database · checked Sep 21, 2026
12	Emsl Analytical, INC	Strong evidence	Cinnaminson, NJ, United StatesHQ checked Sep 21, 2026	501-1,000	719 contacts →
	Strong evidence “As the nation's leading environmental testing firm, EMSL's network of nationwide laboratories has been providing quality analytical services since 1981.” Source: RevenueBase Database · checked Sep 21, 2026
13	TÜV Rheinland North America	Strong evidence	Boxborough, MA, United StatesHQ checked Sep 21, 2026	501-1,000	712 contacts →
	Strong evidence “TÜV Rheinland is a world leader in testing, inspection and certification services for a wide variety of industries.” Source: RevenueBase Database · checked Sep 21, 2026
14	IEH Laboratories And Consulting Group	Strong evidence	Lake Forest Park, WA, United StatesHQ checked Sep 21, 2026	1,001-5,000	651 contacts →
	Strong evidence “IEH is an international lab & consulting services company, offering a comprehensive portfolio of lab testing services and consultation across multiple industries.” Source: RevenueBase Database · checked Sep 21, 2026
15	Microbac Laboratories, INC	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 21, 2026	501-1,000	494 contacts →
	Indirect evidence “Companies of all sizes partner with Microbac to test the quality, safety, and performance of their products and operations.” Source: RevenueBase Database · checked Sep 21, 2026
16	Food Safety NET Services	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 21, 2026	501-1,000	451 contacts →
	Indirect evidence “As part of Certified Group, Food Safety Net Services (FSNS) and Certified Laboratories partner with customers to deliver innovative scientific solutions and expertise – So The…” Source: RevenueBase Database · checked Sep 21, 2026
17	SPL	Strong evidence	Houston, United StatesHQ checked Sep 21, 2026	501-1,000	442 contacts →
	Strong evidence “SPL is a leading provider of compliance and testing services for Environmental, Energy, and other end markets.” Source: RevenueBase Database · checked Sep 21, 2026
18	Astegic	Strong evidence	Falls Church, VA, United StatesHQ checked Sep 21, 2026	51-200	415 contacts →
	Strong evidence “For 15 years, Astegic has been helping Fortune 500 through startup companies with their Testing & QA needs.” Source: RevenueBase Database · checked Sep 21, 2026
19	Logigear Corporation	Strong evidence	San Mateo, CA, United StatesHQ checked Sep 21, 2026	501-1,000	403 contacts →
	Strong evidence “We are celebrating 30 years of testing excellence and innovation at LogiGear, we're proud to be a cornerstone in our clients' journeys, delivering confidence not just in our…” Source: RevenueBase Database · checked Sep 21, 2026
20	NSF	Indirect evidence	Ann Arbor, MI, United StatesHQ checked Sep 21, 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 21, 2026
21	FST Technical Services	Strong evidence	Chandler, AZ, United StatesHQ checked Sep 21, 2026	201-500	381 contacts →
	Strong evidence “Life Cycle Testing, Inspection, Certification & Engineering Solutions for Mission Critical Facilities Worldwide Commitment to Diversity – FST is dedicated to non-discriminatory…” Source: RevenueBase Database · checked Sep 21, 2026
22	Quality Professionals Q-Pros	Strong evidence	TX, United StatesHQ checked Sep 21, 2026	501-1,000	347 contacts →
	Strong evidence “Quality Professionals (Q-Pros) is a global independent software Quality Assurance and Testing services provider supporting enterprise and government organizations.” Source: RevenueBase Database · checked Sep 21, 2026
23	Atl, A Bureau Veritas Company	Indirect evidence	Milford, OH, United StatesHQ checked Sep 21, 2026	501-1,000	314 contacts →
	Indirect evidence “Founded in 1987, ATL, A Bureau Veritas Company, is a Scientific Sourcing Solutions Company.” Source: RevenueBase Database · checked Sep 21, 2026
24	Smithers	Strong evidence	Akron, OH, United StatesHQ checked Sep 21, 2026	501-1,000	310 contacts →
	Strong 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 21, 2026
25	Certified Laboratories, INC	Indirect evidence	Melville, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	287 contacts →
	Indirect evidence “As part of Certified Group, Certified Laboratories partners with customers to deliver innovative scientific solutions and expertise – So The World Can Trust In What It Consumes™.” 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: testing 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 testing companies.
Partial evidence: Its own public description names part of testing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name testing 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 1,085 testing companies based in the United States

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Testing companies based in the United States at a glance

As of Sep 21, 2026

35.6%Verified-email coverage

54.6Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

429

11-50

393

51-200

160

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 1,085 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 testing 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 “testing 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 testing 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 testing 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, 21,123 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.

Testing companies by metro

Testing companies in Houston25

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 testing 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 testing companies are there based in the United States?

RevenueBase identified 1,085 testing 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 testing companies?

Houston leads with 25 headquartered companies, followed by San Diego (16) and Austin (13).

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 21,123 verified decision-maker contacts tracked across these 1,085 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.