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Company lists · Data refreshed November 2026

Top 25 Ad agencies worldwide

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 89,821 companies tracked

RevenueBase identified 89,821 company matches for ad agencies worldwide as of November 2026 and tracks 950,571 professional contacts across them, including 194,727 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for ad 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 November 6, 2026. Country and city lists for ad 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 Nov 6, 2026 How this list was built
89,821Companies
950,571Contacts tracked
194,727Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest ad agencies worldwide

Ranked by team size
Top 25 of 89,821 company matches for ad agencies 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1
Ogilvy
Exact matchNew York, United StatesHQ recorded Nov 6, 202610001+12,961 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 · Nov 6, 2026 · View company records in RevenueBase
2
Clinic
Exact matchLondon, United KingdomHQ recorded Nov 6, 2026n/a7,965 contacts →

Exact match

“Clinic is an independent creative agency.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3
Publicis Media
Exact matchLondon, United KingdomHQ recorded Nov 6, 202610001+7,259 contacts →

Exact match

“Publicis Media harnesses the power of modern media through leading agency brands Dysrupt, Infinite Roar, Publicis Collective, Publicis Health Media, Spark Foundry, Starcom and…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4
LEO Burnett
Exact matchChicago, IL, United StatesHQ recorded Nov 6, 20265,001-10,0005,785 contacts →

Exact match

“Leo Burnett is a communications agency powered by its HumanKind operating system, with the belief that creativity, data and technology work together to transform human behavior…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5
Starcom
Exact matchChicago, IL, United StatesHQ recorded Nov 6, 20265,001-10,0005,745 contacts →

Exact match

“With a history that dates back over 80 years, Starcom is a global communications planning and media leader.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6
IPG Mediabrands
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 202610001+4,396 contacts →

Exact match

“IPG Mediabrands is the media and marketing solutions division of Interpublic Group (NYSE: IPG).”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7
PHD
Exact matchBankside, United KingdomHQ recorded Nov 6, 20261,001-5,0004,197 contacts →

Exact match

“Welcome to PHD.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8
Thompson
Exact matchNew York, United StatesHQ recorded Nov 6, 20265,001-10,0003,822 contacts →

Exact match

“J.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9
Mediacom
Exact matchLondon, NY, United KingdomHQ recorded Nov 6, 20265,001-10,0003,500 contacts →

Exact match

“Hello.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10
Saatchi & Saatchi
Exact matchLondon, NY, United KingdomHQ recorded Nov 6, 20265,001-10,0003,151 contacts →

Exact match

“Saatchi & Saatchi is a leading global communications and advertising network known for its impactful creative ideas that generate powerful emotional connections between consumers…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11
OTHER
Exact matchToronto, FL, CanadaHQ recorded Nov 6, 2026n/a3,078 contacts →

Exact match

“Other.™ is a modern integrated media agency built for marketers who need more from their agency partner.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12
Initiative
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 20265,001-10,0003,042 contacts →

Exact match

“Initiative unlocks business growth for the world’s most ambitious brands.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13
Spark Foundry
Exact matchNY, United StatesHQ recorded Nov 6, 20261,001-5,0003,019 contacts →

Exact match

“As one of the fastest-growing global media agency networks, Spark Foundry is not beholden to legacy.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14
Mccann
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 202610001+2,939 contacts →

Exact match

“We build enduring brands that move people and markets through the radical creativity of Truth Well Told™.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15
Digitas North America
Exact matchBoston, MA, United StatesHQ recorded Nov 6, 20261,001-5,0002,860 contacts →

Exact match

“Digitas is the Networked Experience Agency, built on the vision that we create magnetic experiences that earn the right for brands to exist in human networks.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16
GREY
Exact matchNew York, United StatesHQ recorded Nov 6, 20265,001-10,0002,800 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 · Nov 6, 2026 · View company records in RevenueBase
17
Publicis
Exact matchNew York, United StatesHQ recorded Nov 6, 20261,001-5,0002,785 contacts →

Exact match

“You can either adapt to change, ignore it or lead it.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18
Omnicom
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 202610001+2,762 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 · Nov 6, 2026 · View company records in RevenueBase
19
Mccann Worldgroup
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 202610001+2,664 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 · Nov 6, 2026 · View company records in RevenueBase
20
Horizon Media
Exact matchNew York, NY, United StatesHQ recorded Nov 6, 20261,001-5,0002,506 contacts →

Exact match

“Horizon Media is a leader in driving business-based outcomes for marketers.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21
Omnicom Media Group
Exact matchNew York, United StatesHQ recorded Nov 6, 202610001+2,447 contacts →

Exact match

“Omnicom Media Group (OMG), the media services division of Omnicom Group Inc, delivers transformational experiences for consumers, clients, and talent.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22
Almacén
Exact matchOlivos, ArgentinaHQ recorded Nov 6, 2026n/a2,401 contacts →

Exact match

“Agencia de Publicidad fundada en 2003 por Daniel Onorato y Claudio Lucini.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23
CARAT
Exact matchLondon, United KingdomHQ recorded Nov 6, 20265,001-10,0002,313 contacts →

Exact match

“Carat is the world’s first media agency and is privileged to work with some of today’s most storied and innovative brands.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24
Marketizon
Exact matchLondon, United KingdomHQ recorded Nov 6, 2026n/a1,989 contacts →

Exact match

“Marketizon is the leader in developing innovative, multi-channel marketing technologies.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25
GOVT
Exact matchSingaporeHQ recorded Nov 6, 2026n/a1,978 contacts →

Exact match

“GOVT is an independent creative agency from Singapore that believes in creating advertising that doesn't feel like advertising, and that it can disrupt the industry with human…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 25 of 89,821 ad agencies worldwide

See the full list, filter by size, metro and specialty, and access 194,727 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Ad agencies worldwide at a glance

As of Nov 6, 2026
20.5%Verified-email coverage
10.6Average contacts per company
1-10Median size (employees)
1.7%Largest-city concentration · London
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
54,786
11-50
28,136
51-200
4,862
201-500
1,035
501-1,000
253
1,001-5,000
160
5,001-10,000
53
10001+
78

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 ad agencies are linked below.
What qualifies
Company records worldwide whose business descriptions match “ad 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 194,727 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.

Ad agencies by location

396 lists · largest first

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

How many ad agencies are there worldwide?

RevenueBase identified 89,821 company matches for ad agencies 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?

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

Which country has the most ad agencies?

The United States leads with 14,588 companies, followed by India (8,004) and Brazil (4,526). Every ad agencies list by country and city is linked on this page.

Which city has the most ad agencies?

London leads with 1558 company records, followed by New York (1136) and Sao Paulo (1093).

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 194,727 professional contacts with verified work emails tracked across these 89,821 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.

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