Company lists · Data refreshed November 2026

Top 25 Sustainability communications firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 7,239 companies tracked

RevenueBase identified 7,239 company matches for sustainability communications firms worldwide as of November 2026 and tracks 61,789 professional contacts across them, including 21,764 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for sustainability communications firms worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for sustainability communications firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

7,239Companies

61,789Contacts tracked

21,764Verified emails

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The 25 largest sustainability communications firms worldwide

Ranked by team size

Top 25 of 7,239 company matches for sustainability communications firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	ERM	Exact match	London, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	9,761 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	SLR Consulting	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	4,208 contacts →
	Exact match “SLR is a committed partner in our clients’ sustainability journeys.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	OLA	Exact match	Austin, TX, United StatesHQ recorded Nov 6, 2026	n/a	1,164 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Atrevia	Exact match	Madrid, SpainHQ recorded Nov 6, 2026	501-1,000	656 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Sodali & CO	Exact match	New York, United StatesHQ recorded Nov 6, 2026	501-1,000	452 contacts →
	Exact match “Sodali & Co advises corporate clients worldwide as they navigate the complex dynamic of shareholder and stakeholder interests.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Emperor	Exact match	Aldgate, United KingdomHQ recorded Nov 6, 2026	201-500	445 contacts →
	Exact match “Emperor is one of the UK's leading employee-owned creative communications agencies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	WMH Project	Exact match	Courbevoie, FranceHQ recorded Nov 6, 2026	201-500	350 contacts →
	Exact match “WMH Project est un des groupes de communication hors média leaders en France et en Europe.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Anthesis ESP	Exact match	Manlleu, SpainHQ recorded Nov 6, 2026	201-500	343 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	ROMAN	Exact match	Barcelona, SpainHQ recorded Nov 6, 2026	51-200	335 contacts →
	Exact match “Roman is a communication and Public Relations cross sector agency with 30 years’ experience.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Quantis	Exact match	Lausanne, SwitzerlandHQ recorded Nov 6, 2026	201-500	311 contacts →
	Exact match “Quantis, part of BCG, is a sustainability consulting firm that helps organizations translate sustainability ambition into measurable business value.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Approach Comunicação	Exact match	São Paulo E Rio De Janeiro, BrazilHQ recorded Nov 6, 2026	201-500	288 contacts →
	Exact match “Set up in 1996, Approach is directed by three partners with experience and credibility in the communication market.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Valora Consultores	Exact match	Madrid, SpainHQ recorded Nov 6, 2026	51-200	255 contacts →
	Exact match “VALORA is a consulting company who focus its activity towards a new professional innovative and thrilling challenge.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	SEC Newgate Italia	Exact match	Milan, ItalyHQ recorded Nov 6, 2026	51-200	234 contacts →
	Exact match “Al cuore di ogni organizzazione ci sono le sue relazioni: collaboratori, clienti, filiera, territorio, istituzioni… Perché sono gli "altri" i terminali del suo agire e i…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Radley Yeldar	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	218 contacts →
	Exact match “Radley Yeldar is an award-winning, independent London and Birmingham-based creative consultancy with more than 200 communications specialists.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Sustainometric	Exact match	Amsterdam, United StatesHQ recorded Nov 6, 2026	51-200	216 contacts →
	Exact match “SustainoMetric is committed towards providing high quality customized sustainability research and advice to investors and companies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Headland	Exact match	City Of London, United KingdomHQ recorded Nov 6, 2026	51-200	213 contacts →
	Exact match “We are a communications consultancy powered by collaboration.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Sm, Sistemas Medioambientales, SL	Exact match	Barcelona, SpainHQ recorded Nov 6, 2026	201-500	200 contacts →
	Exact match “Impulsamos la sostenibilidad empresarial con soluciones técnicas y reales.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Stirrup Communication Consultants	Exact match	Mumbai, IndiaHQ recorded Nov 6, 2026	51-200	193 contacts →
	Exact match “Stirrup Communication Consultants Pvt Ltd (Stirrup), previously known as AICL Communications Limited, is a corporate reporting, ESG, stakeholder communications consultancy.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Pública	Exact match	Caba, IndiaHQ recorded Nov 6, 2026	51-200	176 contacts →
	Exact match “Somos una consultora en estrategia y comunicación que trabaja junto a las compañías y líderes más innovadores del mundo para transmitir de forma disruptiva y creativa el impacto…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	SIA Addison	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	51-200	166 contacts →
	Exact match “Sia/Addison creates strategy, design and communications for the world’s most respected corporate and B2B organizations, following our distinctive strategy made visible(TM)…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Grupo Report	Exact match	São Paulo, BrazilHQ recorded Nov 6, 2026	51-200	159 contacts →
	Exact match “Transformar empresas e pessoas por meio da sustentabilidade.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Ince PTY LTD	Exact match	Sandton, South AfricaHQ recorded Nov 6, 2026	51-200	158 contacts →
	Exact match “A trusted leader in investor marketing and stakeholder communications for over a century, we redefine excellence through strategic, integrated, innovative solutions for listed…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	ACRE	Exact match	London, NY, United KingdomHQ recorded Nov 6, 2026	51-200	156 contacts →
	Exact match “Acre is the global market leader for sustainability executive search and recruitment services, exclusively focused on integrating sustainability and catalysing positive change…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Extend Comunicaciones	Exact match	Santiago, ChileHQ recorded Nov 6, 2026	51-200	147 contacts →
	Exact match “Valoramos el poder de las buenas ideas y creemos que con ellas se puede cambiar la historia de un proceso, una marca, una organización.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Antenna Group	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	51-200	144 contacts →
	Exact match “Seeing clearly.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “sustainability communications firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 7,239 sustainability communications firms worldwide

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Sustainability communications firms worldwide at a glance

As of Nov 6, 2026

35.2%Verified-email coverage

8.5Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

5,766

11-50

1,217

51-200

172

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for sustainability communications firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “sustainability communications firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 21,764 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Sustainability communications firms by location

62 lists · largest first

Every Sustainability communications 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “sustainability communications firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainability communications firms are there worldwide?

RevenueBase identified 7,239 company matches for sustainability communications firms worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

ERM tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most sustainability communications firms?

The United States leads with 861 companies, followed by the United Kingdom (558) and France (467). Every sustainability communications firms list by country and city is linked on this page.

Which city has the most sustainability communications firms?

London leads with 264 company records, followed by Sao Paulo (141) and Paris (125).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 21,764 professional contacts with verified work emails tracked across these 7,239 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.