Company lists · Data refreshed November 2026

Top 25 B2B ad agencies worldwide

Name: B2B ad agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 173,717 companies tracked

RevenueBase identified 173,717 company matches for B2B ad agencies worldwide as of November 2026 and tracks 1,502,473 professional contacts across them, including 315,148 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for B2B 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 B2B 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

173,717Companies

1,502,473Contacts tracked

315,148Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest B2B ad agencies worldwide

Ranked by team size

Top 25 of 173,717 company matches for B2B 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Ogilvy	Exact match	New York, United StatesHQ recorded Nov 6, 2026	10001+	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 match	London, United KingdomHQ recorded Nov 6, 2026	n/a	7,965 contacts →
	Exact match “Clinic is an independent creative agency.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Deloitte Digital	Exact match	Usa, CA, FranceHQ recorded Nov 6, 2026	10001+	7,622 contacts →
	Exact match “At Deloitte Digital, we connect brands with the right strategies and tools to create great impact.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Publicis Media	Exact match	London, United KingdomHQ recorded Nov 6, 2026	10001+	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
5	Starcom	Exact match	Chicago, IL, United StatesHQ recorded Nov 6, 2026	5,001-10,000	5,745 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 match	New York, NY, United StatesHQ recorded Nov 6, 2026	10001+	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 match	Bankside, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	4,197 contacts →
	Exact match “Welcome to PHD.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Thompson	Exact match	New York, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,822 contacts →
	Exact match “J.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	IO	Exact match	Herentals, BelgiumHQ recorded Nov 6, 2026	1,001-5,000	3,790 contacts →
	Exact match “iO is an AI-native partner in marketing and technology, with experts across 12 campuses in Belgium, the Netherlands, Sweden, Denmark and Bulgaria.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Xdbs Worldwide	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	1,001-5,000	3,609 contacts →
	Exact match “At XDBS, we primarily work with media agencies, publishers and marketing companies looking to leverage marketing automation and digital marketing capacity and capability to…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Mediacom	Exact match	London, NY, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	3,500 contacts →
	Exact match “Hello.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	SGK	Exact match	Des Plaines, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,461 contacts →
	Exact match “SGK, part of the Propelis Group, is a global brand and content production agency.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Saatchi & Saatchi	Exact match	London, NY, United KingdomHQ recorded Nov 6, 2026	5,001-10,000	3,151 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
14	OTHER	Exact match	Toronto, FL, CanadaHQ recorded Nov 6, 2026	n/a	3,078 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
15	Initiative	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,042 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
16	Spark Foundry	Exact match	NY, United StatesHQ recorded Nov 6, 2026	1,001-5,000	3,019 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
17	Cheil Worldwide	Exact match	Seoul, South KoreaHQ recorded Nov 6, 2026	5,001-10,000	2,976 contacts →
	Exact match “Cheil is a global network of marketing partners committed to the business mission of 'Creating Connected Experiences That Matter,' powered by a network of over experts working…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Mccann	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	10001+	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
19	Digitas North America	Exact match	Boston, MA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,860 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
20	GREY	Exact match	New York, United StatesHQ recorded Nov 6, 2026	5,001-10,000	2,800 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
21	Publicis	Exact match	New York, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,785 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
22	Omnicom	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	10001+	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
23	FIRMA	Exact match	Barcelona, United StatesHQ recorded Nov 6, 2026	n/a	2,759 contacts →
	Exact match “We’re FIRMA, a full-service Branding and Innovation agency.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Mccann Worldgroup	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	10001+	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
25	Horizon Media	Exact match	New York, NY, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,506 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

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 “B2B ad 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 173,717 B2B ad agencies worldwide

See the full list, filter by size, metro and specialty, and access 315,148 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

B2B ad agencies worldwide at a glance

As of Nov 6, 2026

21.0%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

114,929

11-50

48,704

51-200

7,325

201-500

1,434

501-1,000

342

1,001-5,000

209

5,001-10,000

10001+

103

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 B2B ad agencies are linked below.
What qualifies: Company records worldwide whose business descriptions match “B2B 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 315,148 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.

B2B ad agencies by location

647 lists · largest first

Every B2B 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 “B2B ad agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many B2B ad agencies are there worldwide?

RevenueBase identified 173,717 company matches for B2B 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 B2B ad agencies?

The United States leads with 30,301 companies, followed by India (15,768) and the United Kingdom (9,199). Every B2B ad agencies list by country and city is linked on this page.

Which city has the most B2B ad agencies?

London leads with 3288 company records, followed by New York (2159) and Sao Paulo (2131).

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 315,148 professional contacts with verified work emails tracked across these 173,717 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.

Ready to reach these companies? Verified emails and direct dials for all 173,717 B2B ad agencies worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.