Company lists · Data refreshed September 2026

Top 25 Big agencies worldwide

Name: Big agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 26,667 companies tracked

RevenueBase identified 26,667 company matches for big agencies worldwide as of September 2026 and tracks 342,584 professional contacts across them, including 78,246 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for big agencies 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 21, 2026. Country and city lists for big agencies 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 21, 2026 How this list was built

26,667Companies

342,584Contacts tracked

78,246Verified emails

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The 25 largest big agencies worldwide

Ranked by team size

Top 25 of 26,667 company matches for big agencies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Ogilvy	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	10001+	12,165 contacts →
	Exact match “Ogilvy has been creating impact for brands through iconic, culture-changing, value-driving ideas since the company was founded by David Ogilvy 75 years ago.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	WPP	Exact match	Prague, United KingdomHQ recorded Sep 21, 2026	10001+	5,483 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	IPG Mediabrands	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	10001+	4,963 contacts →
	Exact match “IPG Mediabrands is the media and marketing solutions division of Interpublic Group (NYSE: IPG).” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Weber Shandwick	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	1,001-5,000	4,191 contacts →
	Exact match “Weber Shandwick is the earned-first global communications agency.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Mccann Worldgroup	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	10001+	3,874 contacts →
	Exact match “McCann Worldgroup, part of the Interpublic Group (NYSE: IPG), is the irrefutable leader in the business of creativity.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Thompson	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	5,001-10,000	3,574 contacts →
	Exact match “J.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Mediacom	Exact match	London, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	3,247 contacts →
	Exact match “Hello.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	GREY	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	5,001-10,000	2,648 contacts →
	Exact match “Grey’s mission is to create Famously Effective ideas that move people, business, and the world forward-harnessing the power of creativity to solve business problems and deliver…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Horizon Media	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,368 contacts →
	Exact match “Horizon Media is a leader in driving business-based outcomes for marketers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Informal	Exact match	GreeceHQ recorded Sep 21, 2026	5,001-10,000	1,802 contacts →
	Exact match “informal is a company based out of Greece.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Omnicom	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	10001+	1,727 contacts →
	Exact match “Omnicom is the world’s leading marketing and sales company, built for intelligent growth in the next era.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Young & Rubicam	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	10001+	1,602 contacts →
	Exact match “Y&R is a leading global marketing communications company, with more than 189 offices in 90+ countries.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Bbdo Worldwide	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	5,001-10,000	1,501 contacts →
	Exact match “Do Big Things” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Serviceplan Group	Exact match	Munich, GermanyHQ recorded Sep 21, 2026	5,001-10,000	1,298 contacts →
	Exact match “Serviceplan Group is the largest independent, partner-led agency group in Europe.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	TBC	Exact match	Baltimore, MD, United StatesHQ recorded Sep 21, 2026	n/a	1,255 contacts →
	Exact match “TBC is an independently owned, full-service branding, advertising and strategic communications agency with headquarters in Baltimore, Maryland, USA.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Hakuhodo INC	Exact match	Minato-ku, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,168 contacts →
	Exact match “Founded in 1895, Hakuhodo Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Omnicom Media Group UK	Exact match	London, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	983 contacts →
	Exact match “OMG UK delivers transformational experiences for consumers, clients and talent.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Madison World	Exact match	Mumbai, IndiaHQ recorded Sep 21, 2026	1,001-5,000	963 contacts →
	Exact match “Madison World, for the last 36 years has been helping clients solve their marketing challenges and generate sustainable profits.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Scholz & Friends	Exact match	Hamburg, GermanyHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
20	Finn Partners	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	1,001-5,000	903 contacts →
	Exact match “1300+ People.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Zeno Group	Exact match	New York, NY, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
22	BETC	Exact match	Pantin, FranceHQ recorded Sep 21, 2026	501-1,000	869 contacts →
	Exact match “BETC, agence de communication créée en 1994, renouvelle le rapport entre les marques et la création.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	IVE Group	Exact match	Sydney, AustraliaHQ recorded Sep 21, 2026	1,001-5,000	860 contacts →
	Exact match “IVE Group is Australia’s largest diversified marketing company.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Mullenlowe Lintas Group	Exact match	Mumbai, IndiaHQ recorded Sep 21, 2026	201-500	851 contacts →
	Exact match “MullenLowe Lintas Group is one of India’s largest and most admired communication groups.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Banco Caroni	Exact match	Caracas, VenezuelaHQ recorded Sep 21, 2026	1,001-5,000	816 contacts →
	Exact match “Responsable de actividades de Mercadeo, Publicidad, Comunicaciones Corporativas, Calidad y Gestión Comercial de la Red de 122 agencias a Nivel Nacional.” Recorded in the RevenueBase company graph · Sep 21, 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 “big agencies”. 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 26,667 big agencies worldwide

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Big agencies worldwide at a glance

As of Sep 21, 2026

22.8%Verified-email coverage

12.8Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

15,691

11-50

8,653

51-200

1,658

201-500

376

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 big agencies are linked below.
What qualifies: Company records worldwide whose business descriptions match “big agencies” 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 78,246 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 21, 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.

Big agencies by location

127 lists · largest first

Every Big agencies 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 “big agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many big agencies are there worldwide?

RevenueBase identified 26,667 company matches for big agencies 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?

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

Which country has the most big agencies?

The United States leads with 5,861 companies, followed by India (1,651) and Brazil (1,450). Every big agencies list by country and city is linked on this page.

Which city has the most big agencies?

London leads with 510 company records, followed by New York (449) and Sao Paulo (336).

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 78,246 professional contacts with verified work emails tracked across these 26,667 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 21, 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.