Company lists · Data refreshed September 2026

Top 25 Iso audit consulting firms worldwide

Name: Iso audit consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 24,762 companies tracked

RevenueBase identified 24,762 iso audit consulting firms worldwide as of September 2026 and tracks 512,194 professional contacts across them, including 118,754 with verified work emails. Brazil is the largest market and Sao Paulo the largest hub.

This list covers iso audit consulting firms worldwide, 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. Country and city lists for iso audit consulting firms follow the table.

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

24,762Companies

512,194Contacts tracked

118,754Verified emails

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The 25 largest iso audit consulting firms worldwide

Ranked by team size

Top 25 of 24,762 iso audit consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to iso audit 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	SGS	Indirect evidence	Baar, SwitzerlandHQ checked Sep 28, 2026	10001+	60,606 contacts →
	Indirect evidence “SGS is the world’s leading Testing, Inspection and Certification company.” Source: RevenueBase Database · checked Sep 28, 2026
2	Bureau Veritas	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	10001+	46,434 contacts →
	Indirect evidence “Bureau Veritas is a world leader in Testing, Inspection and Certification.” Source: RevenueBase Database · checked Sep 28, 2026
3	Intertek	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	23,155 contacts →
	Indirect evidence “Intertek is a leading Total Quality Assurance provider to industries worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
4	Autonomo	Indirect evidence	Córdoba, SpainHQ checked Sep 28, 2026	n/a	23,018 contacts →
	Indirect evidence “Calidad y Gestión es una empresa consultora de ámbito internacional especializada en servicios de asesoría en las siguientes áreas: Calidad Medio Ambiente Responsabilidad social…” Source: RevenueBase Database · checked Sep 28, 2026
5	DNV	Indirect evidence	Høvik, NorwayHQ checked Sep 28, 2026	10001+	15,983 contacts →
	Indirect evidence “DNV is the independent expert in risk management and assurance, operating in more than 100 countries.” Source: RevenueBase Database · checked Sep 28, 2026
6	TÜV SÜD	Indirect evidence	Munich, GermanyHQ checked Sep 28, 2026	10001+	13,350 contacts →
	Indirect evidence “TÜV SÜD is the trusted partner of choice for safety, security and sustainability solutions.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	TÜV Rheinland Group	Indirect evidence	Cologne, GermanyHQ checked Sep 28, 2026	10001+	7,928 contacts →
	Indirect evidence “Neutral, independent third party For more than 150 years, TÜV Rheinland has stood for ensuring quality, safety, and efficiency in conjunction with people, the environment, and…” Source: RevenueBase Database · checked Sep 28, 2026
9	APAVE	Indirect evidence	Courbevoie Cedex, FranceHQ checked Sep 28, 2026	10001+	6,791 contacts →
	Indirect evidence “Le Groupe Apave est spécialisé dans la maîtrise des risques techniques, humains, environnementaux et numériques.” Source: RevenueBase Database · checked Sep 28, 2026
10	Applus	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	10001+	6,478 contacts →
	Indirect evidence “Applus+ is a worldwide leader in the testing, inspection, and certification sector.” Source: RevenueBase Database · checked Sep 28, 2026
11	Socotec	Indirect evidence	Guyancourt, FranceHQ checked Sep 28, 2026	10001+	5,715 contacts →
	Indirect evidence “SOCOTEC ranks in the Top 10 Best Workplaces® 2025 (category:>2500 employees) and is once again certified Great Place to Work® in 2025, across 18 countries!” Source: RevenueBase Database · checked Sep 28, 2026
12	DEKRA	Indirect evidence	Stuttgart, GermanyHQ checked Sep 28, 2026	10001+	5,573 contacts →
	Indirect evidence “For more than 100 years, DEKRA has been a trusted name in safety.” Source: RevenueBase Database · checked Sep 28, 2026
13	Pt. Sucofindo	Indirect evidence	South Jakarta, IndonesiaHQ checked Sep 28, 2026	5,001-10,000	4,881 contacts →
	Indirect evidence “SUCOFINDO was established in 1956 as a joint venture company between the Government of the Republic of Indonesia and SGS, Geneve, Switzerland.” Source: RevenueBase Database · checked Sep 28, 2026
14	Element Materials Technology	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	4,200 contacts →
	Indirect evidence “The Element Materials Technology Group is one of the world’s leading global providers of testing, inspection, and certification services for a diverse range of products…” Source: RevenueBase Database · checked Sep 28, 2026
15	TRIGO	Indirect evidence	Nanterre, FranceHQ checked Sep 28, 2026	10001+	3,572 contacts →
	Indirect evidence “QUALITY ALONG THE SUPPLY CHAIN Founded in 1997, TRIGO Group is a multinational company providing quality solutions for the automotive, aerospace and other transport industries.” Source: RevenueBase Database · checked Sep 28, 2026
16	Formel D Group	Indirect evidence	Köln, GermanyHQ checked Sep 28, 2026	10001+	2,758 contacts →
	Indirect evidence “Formel D is a global service provider for testing, inspection & certification.” Source: RevenueBase Database · checked Sep 28, 2026
17	OCA Global	Partial evidence	Sant Cugat Del Valles, SpainHQ checked Sep 28, 2026	1,001-5,000	2,690 contacts →
	Partial evidence “OCA Global is a private business group –with headquarters in Spain–, dedicated to inspection, quality control, certification, testing, consulting, and training activities.” Source: RevenueBase Database · checked Sep 28, 2026
18	PT Surveyor Indonesia	Indirect evidence	Jakarta Selatan, IndonesiaHQ checked Sep 28, 2026	5,001-10,000	2,309 contacts →
	Indirect evidence “Surveyor Indonesia didirikan pada tanggal 1 Agustus 1991.” Source: RevenueBase Database · checked Sep 28, 2026
19	TUV India Pvt. LTD	Indirect evidence	Mumbai, IndiaHQ checked Sep 28, 2026	1,001-5,000	2,277 contacts →
	Indirect evidence “TUV India Pvt.” Source: RevenueBase Database · checked Sep 28, 2026
20	ACE	Partial evidence	CanadaHQ checked Sep 28, 2026	n/a	1,915 contacts →
	Partial evidence “consulting firm in quality and environmental management system, quality control,quality assurance and lean manufacturing and productivity improvement.” Source: RevenueBase Database · checked Sep 28, 2026
21	BDO Brazil	Indirect evidence	Sp, BrazilHQ checked Sep 28, 2026	1,001-5,000	1,791 contacts →
	Indirect evidence “Presidida por Raul Corrêa da Silva, a BDO RCS foi fundada em 2001 e desde então mantém participação expressiva no mercado de auditorias.” Source: RevenueBase Database · checked Sep 28, 2026
22	MCA Auditoria E Gerenciamento Ltda	Strong evidence	Belo Horizonte, BrazilHQ checked Sep 28, 2026	1,001-5,000	1,754 contacts →
	Strong evidence “MCA Audit and Management Ltd, which specializes in consulting, auditing and project management and construction, is a company created by professionals graduating from leading…” Source: RevenueBase Database · checked Sep 28, 2026
23	Sikich	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,688 contacts →
	Partial evidence “Sikich offers the public and private sectors a diverse platform of professional services across consulting, technology, and compliance.” Source: RevenueBase Database · checked Sep 28, 2026
24	Planit	Indirect evidence	Sydney, AustraliaHQ checked Sep 28, 2026	1,001-5,000	1,612 contacts →
	Indirect evidence “At Planit, we provide businesses with the vision, precision and independence they need to improve the quality of their software and the way they deliver it.” Source: RevenueBase Database · checked Sep 28, 2026
25	QIMA	Indirect evidence	Hong KongHQ checked Sep 28, 2026	5,001-10,000	1,549 contacts →
	Indirect evidence “QIMA is more than a testing, inspection, certification, and compliance company: We are on a mission to offer clients smart solutions to make products consumers can trust.” 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 audit 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 audit consulting firms.
Partial evidence: Its own public description names part of iso audit 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 audit 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 24,762 iso audit consulting firms worldwide

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Iso audit consulting firms worldwide at a glance

As of Sep 28, 2026

23.2%Verified-email coverage

20.7Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · Sao Paulo

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

16,001

11-50

6,493

51-200

1,455

201-500

419

501-1,000

131

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 audit 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.
Coverage: Every country. Country and city lists for iso audit consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “iso audit 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 audit 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 audit consulting firms, and records with no verified work email.
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, 118,754 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 audit consulting firms by location

109 lists · largest first

Every Iso audit consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 audit 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 audit consulting firms are there worldwide?

RevenueBase identified 24,762 iso audit consulting firms worldwide 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?

SGS, headquartered in Baar, tops this list with the largest team on record.

Which country has the most iso audit consulting firms?

Brazil leads with 1,968 companies, followed by the United States (1,854) and India (1,530). Every iso audit consulting firms list by country and city is linked on this page.

Which city has the most iso audit consulting firms?

Sao Paulo leads with 404 headquartered companies, followed by Lima (258) and Dubai (204).

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 118,754 verified decision-maker contacts tracked across these 24,762 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.