Company lists · Data refreshed September 2026

Top 25 Iso certification consulting firms based in the United States

Name: Iso certification consulting 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 28, 2026 1,989 companies tracked

RevenueBase identified 1,989 iso certification consulting firms headquartered in the United States as of September 2026 and tracks 33,525 professional contacts across them, including 12,338 with verified work emails. Houston is the largest hub.

This list covers iso certification consulting 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 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

1,989Companies

33,525Contacts tracked

12,338Verified emails

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The 25 largest iso certification consulting firms based in the United States

Ranked by team size

Top 25 of 1,989 iso certification consulting firms 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 iso certification consulting 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	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	Nv5	Partial evidence	Hollywood, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,230 contacts →
	Partial 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 28, 2026
3	Applied Technical Services, LLC	Partial evidence	Marietta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	890 contacts →
	Partial 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	Partial evidence	Boxborough, MA, United StatesHQ checked Sep 28, 2026	501-1,000	712 contacts →
	Partial 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	Safety Management Group	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	201-500	485 contacts →
	Indirect evidence “We are people-centric Quality, Health, Safety, and Environmental (QHSE) consultants driven to reduce risk, foster sustainable operations, and enhance safety culture to protect…” Source: RevenueBase Database · checked Sep 28, 2026
6	FST Technical Services	Partial evidence	Chandler, AZ, United StatesHQ checked Sep 28, 2026	201-500	381 contacts →
	Partial 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 28, 2026
7	Smithers	Strong evidence	Akron, OH, United StatesHQ checked Sep 28, 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 28, 2026
8	Certifiedsafety, An Onpoint Company	Indirect evidence	Deer Park, TX, United StatesHQ checked Sep 28, 2026	501-1,000	293 contacts →
	Indirect evidence “Please follow Onpoint Industrial Services, LLC for the latest news and updates!” Source: RevenueBase Database · checked Sep 28, 2026
9	Vaisesika	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 28, 2026	201-500	266 contacts →
	Partial evidence “Vaisesika Consulting is a global tech and consulting firm that helps businesses transform their digital setups and stay compliant in a straightforward way.” Source: RevenueBase Database · checked Sep 28, 2026
10	Hyde Engineering Consulting	Partial evidence	Louisville, CO, United StatesHQ checked Sep 28, 2026	201-500	253 contacts →
	Partial evidence “Hyde E+C is an international engineering consulting firm that helps companies operate more efficiently, get products to market more quickly, meet regulatory requirements more…” Source: RevenueBase Database · checked Sep 28, 2026
11	Valsource INC	Indirect evidence	Downingtown, PA, United StatesHQ checked Sep 28, 2026	201-500	245 contacts →
	Indirect evidence “Since 1996, ValSource has worked with hundreds of pharmaceutical, biopharma, and medical device organizations around the world.” Source: RevenueBase Database · checked Sep 28, 2026
12	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
13	Omnex INC	Indirect evidence	Ann Arbor, MI, United StatesHQ checked Sep 28, 2026	501-1,000	216 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
14	Certified Group	Indirect evidence	Melville, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	206 contacts →
	Indirect evidence “Certified Group partners with customers to deliver innovative scientific solutions and expertise – So The World Can Trust In What It Consumes®.” Source: RevenueBase Database · checked Sep 28, 2026
15	Lachman Consultant Services	Indirect evidence	Westbury, NY, United StatesHQ checked Sep 28, 2026	51-200	179 contacts →
	Indirect evidence “Quality & Compliance \| Regulatory Strategy \| Inspection Readiness & Remediation \| Data Integrity.” Source: RevenueBase Database · checked Sep 28, 2026
16	Insight Assurance	Partial evidence	Tampa, FL, United StatesHQ checked Sep 28, 2026	201-500	174 contacts →
	Partial evidence “Insight Assurance is a security and compliance firm trusted by more than 1,500 organizations for their SOC 1, SOC 2, SOC 3, PCI DSS, ISO 27001, ISO 27017/27018, ISO 27701, ISO…” Source: RevenueBase Database · checked Sep 28, 2026
17	Timber Products Inspection, INC	Partial evidence	Peachtree City, GA, United StatesHQ checked Sep 28, 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 28, 2026
18	MSR Technology Group	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 28, 2026	1,001-5,000	124 contacts →
	Indirect evidence “As a leader in professional services, MSR Technology Group ignites growth for businesses across diverse industries.” Source: RevenueBase Database · checked Sep 28, 2026
19	Royalcert International Registrars	Partial evidence	Watertown, MA, United StatesHQ checked Sep 28, 2026	501-1,000	120 contacts →
	Partial 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
20	Aeis LLC	Partial evidence	South Plainfield, NJ, United StatesHQ checked Sep 28, 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 28, 2026
21	Certerra	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 28, 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 28, 2026
22	CCI	Partial evidence	St. Louis, MO, United StatesHQ checked Sep 28, 2026	51-200	107 contacts →
	Partial evidence “Code Consultants, Inc.(CCI) is an engineering and consulting firm providing a diverse range of design and consultation services since 1973: Fire protection & life safety code…” Source: RevenueBase Database · checked Sep 28, 2026
23	EXIDA	Indirect evidence	Sellersville, PA, United StatesHQ checked Sep 28, 2026	51-200	103 contacts →
	Indirect evidence “Companies around the world turn to exida for help and guidance related to functional safety, alarm management, and cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
24	Issi Information Security Systems International	Partial evidence	Santa Cruz, CA, United StatesHQ checked Sep 28, 2026	51-200	91 contacts →
	Partial evidence “ISSI is a consulting, auditing and marketing services company, providing services to the world's largest hyperscale cloud platform providers and IT companies.” Source: RevenueBase Database · checked Sep 28, 2026
25	Diversified Safety Services, LLC	Partial evidence	Rosedale, MD, United StatesHQ checked Sep 28, 2026	51-200	88 contacts →
	Partial evidence “Diversified Safety Services is a third-party safety consulting firm.” 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: iso certification consulting 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 iso certification consulting firms.
Partial evidence: Its own public description names part of iso certification consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name iso certification consulting 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 1,989 iso certification consulting firms based in the United States

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Iso certification consulting firms based in the United States at a glance

As of Sep 28, 2026

36.8%Verified-email coverage

16.9Average contacts per company

1-10Median size (employees)

4.3%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,368

11-50

449

51-200

107

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 1,989 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 iso certification consulting 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 “iso certification consulting 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 iso certification consulting 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 iso certification consulting 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, 12,338 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.

Iso certification consulting firms by metro

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 iso certification consulting 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 iso certification consulting firms are there based in the United States?

RevenueBase identified 1,989 iso certification consulting 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?

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

Which city has the most iso certification consulting firms?

Houston leads with 85 headquartered companies, followed by New York (31) and San Diego (25).

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 12,338 verified decision-maker contacts tracked across these 1,989 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.