Company lists · Data refreshed September 2026

Top 25 Internal communications firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 21,601 companies tracked

RevenueBase identified 21,601 company matches for internal communications firms worldwide as of September 2026 and tracks 197,124 professional contacts across them, including 57,052 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for internal 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 September 20, 2026. Country and city lists for internal 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 Sep 20, 2026 How this list was built

21,601Companies

197,124Contacts tracked

57,052Verified emails

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The 25 largest internal communications firms worldwide

Ranked by team size

Top 25 of 21,601 company matches for internal communications firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 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	Edelman	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	5,001-10,000	6,242 contacts →
	Exact match “Edelman is a global communications firm that partners with businesses and organizations to evolve, promote and protect their brands and reputations.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Burson	Exact match	New York, United StatesHQ recorded Sep 20, 2026	5,001-10,000	3,541 contacts →
	Exact match “Burson is the global leader in communications, purpose-built to create value for our clients through reputation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	Adfactors PR	Exact match	Mumbai, IndiaHQ recorded Sep 20, 2026	1,001-5,000	1,920 contacts →
	Exact match “Adfactors PR, founded in 1997, is India's largest Public Relations firm.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	LLYC	Exact match	Madrid, SpainHQ recorded Sep 20, 2026	1,001-5,000	1,520 contacts →
	Exact match “Together, we enhance and protect the value of your business.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	Hill & Knowlton	Exact match	NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,450 contacts →
	Exact match “Hill & Knowlton is a strategic and creative partner to drive breakthrough opportunities for growth and value creation, advance corporate strategy, and build reputation capital and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	FSB Comunicação	Exact match	Rio De Janeiro, BrazilHQ recorded Sep 20, 2026	501-1,000	1,277 contacts →
	Exact match “FSB Comunicações is an Integrated Communications agency focused on results.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Scholz & Friends	Exact match	Hamburg, GermanyHQ recorded Sep 20, 2026	1,001-5,000	944 contacts →
	Exact match “Scholz & Friends provides an all-inclusive selection of resources to assist client partners in sharing their stories and ideas.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Finn Partners	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	903 contacts →
	Exact match “1300+ People.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Zeno Group	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	501-1,000	887 contacts →
	Exact match “Zeno Group is the fiercely independent and global, integrated communications agency, born from PR.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Porter Novelli	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	501-1,000	821 contacts →
	Exact match “Porter Novelli is the strategic communications company, fueled by innovation, empowering clients to do business better in an ever-changing world.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Ruder Finn	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	815 contacts →
	Exact match “Ruder Finn is one of the world’s largest global independent integrated marketing and communications agencies, leading at the intersection of technology, human creativity, and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	ICR	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	201-500	693 contacts →
	Exact match “ICR is a strategic communications and advisory firm that helps management teams align how they communicate with how markets think.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Atrevia	Exact match	Madrid, SpainHQ recorded Sep 20, 2026	501-1,000	623 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	Jimjam Ideas	Exact match	Sydney, AustraliaHQ recorded Sep 20, 2026	n/a	621 contacts →
	Exact match “JIMJAM Ideas is an award winning integrated communications agency that believes CONNECTED IDEAS to be the key to powerful and transformative marketing.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Prosek Partners	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	201-500	543 contacts →
	Exact match “Prosek Partners builds – and protects – the top brands in business.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Hunter	Exact match	New York, United StatesHQ recorded Sep 20, 2026	201-500	482 contacts →
	Exact match “HUNTER is an award-winning, integrated marketing communications firm with offices in New York, Los Angeles, Chicago, and London and partnerships that extend our reach globally.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	FSB Holding	Exact match	São Paulo, BrazilHQ recorded Sep 20, 2026	1,001-5,000	471 contacts →
	Exact match “Reputação é resultado.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	MSL India	Exact match	Mumbai, IndiaHQ recorded Sep 20, 2026	501-1,000	469 contacts →
	Exact match “MSL is Publicis Groupe’s public relations and integrated communications network, one of the world’s largest.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	Avian We	Exact match	New Delhi, IndiaHQ recorded Sep 20, 2026	201-500	457 contacts →
	Exact match “About Avian We.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	BCW Global	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	449 contacts →
	Exact match “BCW is the global communications agency built to move people.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Workshop	Exact match	Omaha, NE, United StatesHQ recorded Sep 20, 2026	51-200	447 contacts →
	Exact match “Workshop is a modern, purpose-built internal communications platform that helps teams create, send, manage, and measure employee communications in one place, starting with email…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Inpress Porter Novelli	Exact match	Sao Paulo, BrazilHQ recorded Sep 20, 2026	201-500	441 contacts →
	Exact match “Agência de comunicação full service com mais de 150 clientes nos segmentos corporativo, consumo, mídia e entretenimento, saúde, tecnologia e telecomunicações, dentre outros.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	Emperor	Exact match	Aldgate, United KingdomHQ recorded Sep 20, 2026	201-500	415 contacts →
	Exact match “Emperor is one of the UK's leading employee-owned creative communications agencies.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	Repindia	Exact match	Delhi, IndiaHQ recorded Sep 20, 2026	201-500	410 contacts →
	Exact match “This is RepIndia.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	Sunshine Sachs Morgan & Lylis	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	201-500	364 contacts →
	Exact match “Sunshine Sachs Morgan & Lylis is an independent, full-service firm specializing in communications and narrative strategy.” Recorded in the RevenueBase company graph · Sep 20, 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 “internal 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 21,601 internal communications firms worldwide

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Internal communications firms worldwide at a glance

As of Sep 20, 2026

28.9%Verified-email coverage

9.1Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

15,602

11-50

4,943

51-200

789

201-500

151

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 internal communications firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “internal 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 57,052 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 September 20, 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.

Internal communications firms by location

104 lists · largest first

Every Internal 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 “internal communications firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many internal communications firms are there worldwide?

RevenueBase identified 21,601 company matches for internal communications firms worldwide as of September 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?

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

Which country has the most internal communications firms?

The United States leads with 4,394 companies, followed by Brazil (1,443) and the United Kingdom (1,341). Every internal communications firms list by country and city is linked on this page.

Which city has the most internal communications firms?

London leads with 587 company records, followed by Sao Paulo (446) and New York (395).

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 57,052 professional contacts with verified work emails tracked across these 21,601 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 September 20, 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.