Company lists · Data refreshed September 2026

Top 25 Sustainability auditors worldwide

Name: Sustainability auditors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 6,256 companies tracked

RevenueBase identified 6,256 sustainability auditors worldwide as of September 2026 and tracks 113,442 professional contacts across them, including 32,953 with verified work emails. The United States is the largest market and London the largest hub.

This list covers sustainability auditors 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 22, 2026. Country and city lists for sustainability auditors 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 22, 2026 86% judged on-target in blind review

6,256Companies

113,442Contacts tracked

32,953Verified emails

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The 25 largest sustainability auditors worldwide

Ranked by team size

Top 25 of 6,256 sustainability auditors worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainability auditors: 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	Autonomo	Indirect evidence	Córdoba, SpainHQ checked Sep 22, 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 22, 2026
2	DNV	Indirect evidence	Høvik, NorwayHQ checked Sep 22, 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 22, 2026
3	TÜV SÜD	Partial evidence	Munich, GermanyHQ checked Sep 22, 2026	10001+	13,350 contacts →
	Partial evidence “TÜV SÜD is the trusted partner of choice for safety, security and sustainability solutions.” Source: RevenueBase Database · checked Sep 22, 2026
4	ERM	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	9,119 contacts →
	Partial evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 22, 2026
5	Ecovadis	Indirect evidence	Paris, JapanHQ checked Sep 22, 2026	1,001-5,000	1,854 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
6	DQS	Indirect evidence	Frankfurt Am Main, GermanyHQ checked Sep 22, 2026	1,001-5,000	1,424 contacts →
	Indirect evidence “DQS – Leveraging Quality, Driving Success.” Source: RevenueBase Database · checked Sep 22, 2026
7	AENOR	Indirect evidence	Madrid, SpainHQ checked Sep 22, 2026	501-1,000	961 contacts →
	Indirect evidence “AENOR is a global company, that identifies and helps organizations to overcome relevant competitiveness gaps.” Source: RevenueBase Database · checked Sep 22, 2026
8	Achilles Information Limited	Indirect evidence	Abingdon, United KingdomHQ checked Sep 22, 2026	501-1,000	836 contacts →
	Indirect evidence “For more than 30 years, Achilles has protected organisations’ business interests and reputations by providing unrivalled levels of supply chain transparency, carbon reduction and…” Source: RevenueBase Database · checked Sep 22, 2026
9	Ecocert Group	Indirect evidence	L’isle-jourdain, FranceHQ checked Sep 22, 2026	1,001-5,000	809 contacts →
	Indirect evidence “For over 30 years, ECOCERT has and continues to assist stakeholders in the implementation and promotion of sustainable practices through certification, consulting and training.” Source: RevenueBase Database · checked Sep 22, 2026
10	SCS Global Services	Partial evidence	Emeryville, CA, United StatesHQ checked Sep 22, 2026	201-500	667 contacts →
	Partial 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
11	ADP Consulting	Partial evidence	Melbourne, AustraliaHQ checked Sep 22, 2026	201-500	468 contacts →
	Partial evidence “ADP Consulting, an Ayesa company, is a sustainability-led engineering consultancy on a quest to inspire a better world through influence and design.” Source: RevenueBase Database · checked Sep 22, 2026
12	SIPL	Indirect evidence	Noida, IndiaHQ checked Sep 22, 2026	n/a	400 contacts →
	Indirect evidence “SIPL Pvt Ltd is an established and reputed firm in the Sustainable domain since 2008.” Source: RevenueBase Database · checked Sep 22, 2026
13	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 22, 2026
14	Preferred By Nature	Indirect evidence	Copenhagen, DenmarkHQ checked Sep 22, 2026	201-500	361 contacts →
	Indirect evidence “Preferred by Nature is an international non-profit organisation working to support better land management and business practices that benefit people, nature and the climate.” Source: RevenueBase Database · checked Sep 22, 2026
15	Ecol Studio Lifeanalytics	Indirect evidence	Lucca, ItalyHQ checked Sep 22, 2026	201-500	345 contacts →
	Indirect evidence “Salute, Sicurezza, Ambiente e Qualità del prodotto: sei davvero sostenibile?” Source: RevenueBase Database · checked Sep 22, 2026
16	Anthesis ESP	Indirect evidence	Manlleu, SpainHQ checked Sep 22, 2026	201-500	337 contacts →
	Indirect evidence “Som una empresa especialitzada en sostenibilitat, aliada amb les organitzacions, territoris i persones compromesos amb un món més sostenible, als quals acompanyem en la seva…” Source: RevenueBase Database · checked Sep 22, 2026
17	Quantis	Partial evidence	Lausanne, SwitzerlandHQ checked Sep 22, 2026	201-500	325 contacts →
	Partial evidence “Quantis, part of BCG, is a sustainability consulting firm that helps organizations translate sustainability ambition into measurable business value.” Source: RevenueBase Database · checked Sep 22, 2026
18	Position Green	Partial evidence	Malmö, SwedenHQ checked Sep 22, 2026	201-500	306 contacts →
	Partial evidence “Position Green is a sustainability data reporting and management platform that combines software capabilities with expert advisory services to revolutionize the way businesses…” Source: RevenueBase Database · checked Sep 22, 2026
19	EQA España	Indirect evidence	Madrid, SpainHQ checked Sep 22, 2026	201-500	298 contacts →
	Indirect evidence “EQA es una entidad internacional de certificación, verificación e inspección, con más de 25 años de trayectoria.” Source: RevenueBase Database · checked Sep 22, 2026
20	Kader Group	Indirect evidence	Zeist, NetherlandsHQ checked Sep 22, 2026	201-500	290 contacts →
	Indirect evidence “Kader Group verbetert de kwaliteit, veiligheid en duurzaamheid van organisaties, zodat een ieder goed kan zorgen voor mens, milieu en maatschappij.” Source: RevenueBase Database · checked Sep 22, 2026
21	NQA	Indirect evidence	Dunstable, United KingdomHQ checked Sep 22, 2026	501-1,000	267 contacts →
	Indirect evidence “NQA is a leading global certification body, respected for providing flexible and supportive certification and training services that are technically advanced and meet the needs of…” Source: RevenueBase Database · checked Sep 22, 2026
22	Global Reporting Initiative GRI	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 22, 2026	51-200	249 contacts →
	Indirect evidence “Global Reporting Initiative (GRI) is the independent nonprofit organization that is the architect of the common global language to assess and report on environmental, social and…” Source: RevenueBase Database · checked Sep 22, 2026
23	D2o	Indirect evidence	Jaipur, IndiaHQ checked Sep 22, 2026	51-200	217 contacts →
	Indirect evidence “Design2Occupancy Services LLP (D2O) is a leading organization providing a platform and solutions in Energy Efficiency Analysis and Energy Code Compliances, Climate Change…” Source: RevenueBase Database · checked Sep 22, 2026
24	Sustainometric	Partial evidence	Amsterdam, United StatesHQ checked Sep 22, 2026	51-200	213 contacts →
	Partial evidence “SustainoMetric is committed towards providing high quality customized sustainability research and advice to investors and companies.” Source: RevenueBase Database · checked Sep 22, 2026
25	Icea Istituto Certificazioni Etiche E Ambientali	Indirect evidence	Bologna, ItalyHQ checked Sep 22, 2026	51-200	200 contacts →
	Indirect evidence “ICEA, Institute for Ethical and Environmental Certification, is a nonprofit consortium with the participation of institutions, associations, companies and civil society…” 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: sustainability auditors. 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 sustainability auditors.
Partial evidence: Its own public description names part of sustainability auditors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainability auditors. 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 6,256 sustainability auditors worldwide

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Sustainability auditors worldwide at a glance

As of Sep 22, 2026

29.0%Verified-email coverage

18.1Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

4,537

11-50

1,357

51-200

244

201-500

501-1,000

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 sustainability auditors, 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 sustainability auditors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sustainability auditors”. 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 sustainability auditors), 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 sustainability auditors, 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, 32,953 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.

Sustainability auditors by location

34 lists · largest first

Every Sustainability auditors list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 sustainability auditors, 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 sustainability auditors are there worldwide?

RevenueBase identified 6,256 sustainability auditors 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?

Autonomo, headquartered in Cordoba, tops this list with the largest team on record.

Which country has the most sustainability auditors?

The United States leads with 489 companies, followed by the United Kingdom (450) and Brazil (378). Every sustainability auditors list by country and city is linked on this page.

Which city has the most sustainability auditors?

London leads with 170 headquartered companies, followed by Sao Paulo (80) and Paris (65).

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 32,953 verified decision-maker contacts tracked across these 6,256 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.