Company lists · Data refreshed October 2026

Top 25 Internal communications consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 34,398 companies tracked

RevenueBase identified 34,398 internal communications consulting firms worldwide as of October 2026 and tracks 268,881 professional contacts across them, including 76,065 with verified work emails and 43,025 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers internal communications 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 October 1, 2026. Country and city lists for internal communications 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 Oct 1, 2026 86% judged on-target in blind review

34,398Companies

268,881Contacts tracked

76,065Verified emails

43,025Mobile numbers

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The 25 largest internal communications consulting firms worldwide

Ranked by team size

Top 25 of 34,398 internal communications consulting firms worldwide, ranked by team size, largest first. Data refreshed Oct 1, 2026. RevenueBase Smart Search rates how each company's information relates to internal communications 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	Idol Image Consulting	Partial evidence	Kula, HI, TürkiyeHQ checked Oct 1, 2026	n/a	12,976 contacts →
	Partial evidence “IDOL Image Consulting has developed strategies to help individuals, groups or corporate organizations face today’s challenges and fierce competition.” Source: RevenueBase Database · checked Oct 1, 2026
2	Deloitte Digital	Indirect evidence	Usa, FranceHQ checked Oct 1, 2026	10001+	7,716 contacts →
	Indirect evidence “At Deloitte Digital, we connect brands with the right strategies and tools to create great impact.” Source: RevenueBase Database · checked Oct 1, 2026
3	Edelman	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	5,001-10,000	6,242 contacts →
	Partial evidence “Edelman is a global communications firm that partners with businesses and organizations to evolve, promote and protect their brands and reputations.” Source: RevenueBase Database · checked Oct 1, 2026
4	Heidrick & Struggles	Partial evidence	Chicago, IL, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,376 contacts →
	Partial evidence “Heidrick & Struggles is the premier provider of executive search, corporate culture and leadership consulting services.” Source: RevenueBase Database · checked Oct 1, 2026
5	Knowit	Indirect evidence	Stockholm, SwedenHQ checked Oct 1, 2026	1,001-5,000	3,317 contacts →
	Indirect evidence “Currently, we are more than 3,700 employees mainly in the Nordic countries, but also in operations in Germany and Poland, working with clients and partners to develop innovative…” Source: RevenueBase Database · checked Oct 1, 2026
6	TENEO	Indirect evidence	New York, NY, United StatesHQ checked Oct 1, 2026	1,001-5,000	1,930 contacts →
	Indirect evidence “Teneo is the global CEO advisory firm.” Source: RevenueBase Database · checked Oct 1, 2026
7	MCA	Partial evidence	Westport, CT, United StatesHQ checked Oct 1, 2026	n/a	1,650 contacts →
	Partial evidence “MCAworks is a strategic marketing consulting firm passionately dedicated to helping our clients accelerate and sustain business growth.” Source: RevenueBase Database · checked Oct 1, 2026
8	Abylsen	Indirect evidence	Paris, FranceHQ checked Oct 1, 2026	1,001-5,000	1,577 contacts →
	Indirect evidence “In a world that too often follows currents, Abylsen has been opening itself up to new directions.” Source: RevenueBase Database · checked Oct 1, 2026
9	LLYC	Indirect evidence	Madrid, SpainHQ checked Oct 1, 2026	1,001-5,000	1,520 contacts →
	Indirect evidence “Together, we enhance and protect the value of your business.” Source: RevenueBase Database · checked Oct 1, 2026
10	Hill & Knowlton	Indirect evidence	NY, United StatesHQ checked Oct 1, 2026	1,001-5,000	1,450 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Oct 1, 2026
11	FSB Comunicação	Partial evidence	Rio De Janeiro, BrazilHQ checked Oct 1, 2026	501-1,000	1,277 contacts →
	Partial evidence “FSB Comunicações is an Integrated Communications agency focused on results.” Source: RevenueBase Database · checked Oct 1, 2026
12	W3global	Partial evidence	Frisco, TX, United StatesHQ checked Oct 1, 2026	501-1,000	1,149 contacts →
	Partial evidence “W3Global is a leading provider of end-to-end consulting services, empowering businesses to achieve their strategic goals and optimize their operations.” Source: RevenueBase Database · checked Oct 1, 2026
13	Falconi	Indirect evidence	Sao Paulo, BrazilHQ checked Oct 1, 2026	501-1,000	990 contacts →
	Indirect evidence “A Falconi é a maior consultoria brasileira de gestão empresarial.” Source: RevenueBase Database · checked Oct 1, 2026
14	Ketchum	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	1,001-5,000	963 contacts →
	Partial evidence “We are Ketchum, a global communications consultancy fueled by empathy and intelligence – progress at work for innovation, our employees and our clients since 1923.” Source: RevenueBase Database · checked Oct 1, 2026
15	Scholz & Friends	Indirect evidence	Hamburg, GermanyHQ checked Oct 1, 2026	1,001-5,000	944 contacts →
	Indirect evidence “Scholz & Friends provides an all-inclusive selection of resources to assist client partners in sharing their stories and ideas.” Source: RevenueBase Database · checked Oct 1, 2026
16	Zeno Group	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	501-1,000	887 contacts →
	Partial evidence “Zeno Group is the fiercely independent and global, integrated communications agency, born from PR.” Source: RevenueBase Database · checked Oct 1, 2026
17	Accuracy	Strong evidence	Paris, SingaporeHQ checked Oct 1, 2026	501-1,000	868 contacts →
	Strong evidence “Accuracy is a wholly independent international consulting firm providing advice to company management and shareholders for their strategic or critical decisions, notably in…” Source: RevenueBase Database · checked Oct 1, 2026
18	Porter Novelli	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	501-1,000	821 contacts →
	Partial evidence “Porter Novelli is the strategic communications company, fueled by innovation, empowering clients to do business better in an ever-changing world.” Source: RevenueBase Database · checked Oct 1, 2026
19	MANTU	Strong evidence	Chêne-bourg, SwitzerlandHQ checked Oct 1, 2026	10001+	818 contacts →
	Strong evidence “Mantu is an independent international consulting player, founded in 2007.” Source: RevenueBase Database · checked Oct 1, 2026
20	Ruder Finn	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	1,001-5,000	815 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Oct 1, 2026
21	Lucas Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Oct 1, 2026	10001+	756 contacts →
	Partial evidence “Ultimate Minds is a professional consulting and marketing firm dedicated to empowering businesses, nonprofits, and startups with smart, affordable, and results-driven solutions.” Source: RevenueBase Database · checked Oct 1, 2026
22	ICR	Partial evidence	New York, NY, United StatesHQ checked Oct 1, 2026	201-500	693 contacts →
	Partial evidence “ICR is a strategic communications and advisory firm that helps management teams align how they communicate with how markets think.” Source: RevenueBase Database · checked Oct 1, 2026
23	Prophet	Partial evidence	San Francisco, CA, United StatesHQ checked Oct 1, 2026	501-1,000	661 contacts →
	Partial evidence “Prophet is the Uncommon Growth Company-accelerating impact for business and marketing leaders through consulting, experience, and creative services.” Source: RevenueBase Database · checked Oct 1, 2026
24	Atrevia	Indirect evidence	Madrid, SpainHQ checked Oct 1, 2026	501-1,000	623 contacts →
	Indirect evidence Source: RevenueBase Database · checked Oct 1, 2026
25	Jimjam Ideas	Partial evidence	Sydney, AustraliaHQ checked Oct 1, 2026	n/a	621 contacts →
	Partial evidence “JIMJAM Ideas is an award winning integrated communications agency that believes CONNECTED IDEAS to be the key to powerful and transformative marketing.” Source: RevenueBase Database · checked Oct 1, 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: internal communications 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 internal communications consulting firms.
Partial evidence: Its own public description names part of internal communications consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name internal communications 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 34,398 internal communications consulting firms worldwide

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Internal communications consulting firms worldwide at a glance

As of Oct 1, 2026

28.3%Verified-email coverage

16.0%Mobile-number coverage

7.8Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · London

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

27,762

11-50

5,511

51-200

787

201-500

143

501-1,000

1,001-5,000

5,001-10,000

10001+

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 internal communications 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: 38 countries, largest first: the United States, France, the United Kingdom, Brazil, Germany, Canada, the Netherlands, Italy, Spain, Australia and 28 more. Country and city lists for internal communications consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “internal communications 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 internal communications 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 internal communications 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, 76,065 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 October 1, 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.

Internal communications consulting firms by location

170 lists · largest first

Every Internal communications 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 internal communications 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 internal communications consulting firms are there worldwide?

RevenueBase identified 34,398 internal communications consulting firms worldwide as of October 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?

Idol Image Consulting, headquartered in Kula, tops this list with the largest team on record.

Which country has the most internal communications consulting firms?

The United States leads with 10,421 companies, followed by France (3,182) and the United Kingdom (2,888). Every internal communications consulting firms list by country and city is linked on this page.

Which city has the most internal communications consulting firms?

London leads with 1270 headquartered companies, followed by Paris (929) and Sao Paulo (888).

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 76,065 verified decision-maker contacts tracked across these 34,398 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 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.