Company lists · Data refreshed September 2026

Top 25 Advertising consulting services worldwide

Name: Advertising consulting services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 47,099 companies tracked

RevenueBase identified 47,099 advertising consulting services worldwide as of September 2026 and tracks 283,440 professional contacts across them, including 51,456 with verified work emails. The United States is the largest market and London the largest hub.

This list covers advertising consulting services 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 September 21, 2026. Country and city lists for advertising consulting services 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 Sep 21, 2026 86% judged on-target in blind review

47,099Companies

283,440Contacts tracked

51,456Verified emails

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The 25 largest advertising consulting services worldwide

Ranked by team size

Top 25 of 47,099 advertising consulting services worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to advertising consulting services: 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	GREY	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,648 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
2	Horizon Media	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,368 contacts →
	Indirect evidence “Horizon Media is a leader in driving business-based outcomes for marketers.” Source: RevenueBase Database · checked Sep 21, 2026
3	Informal	Indirect evidence	GreeceHQ checked Sep 21, 2026	5,001-10,000	1,802 contacts →
	Indirect evidence “informal is a company based out of Greece.” Source: RevenueBase Database · checked Sep 21, 2026
4	Omnicom	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	10001+	1,727 contacts →
	Indirect evidence “Omnicom is the world’s leading marketing and sales company, built for intelligent growth in the next era.” Source: RevenueBase Database · checked Sep 21, 2026
5	TBC	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	n/a	1,255 contacts →
	Partial evidence “TBC is an independently owned, full-service branding, advertising and strategic communications agency with headquarters in Baltimore, Maryland, USA.” Source: RevenueBase Database · checked Sep 21, 2026
6	IVE Group	Indirect evidence	Sydney, AustraliaHQ checked Sep 21, 2026	1,001-5,000	860 contacts →
	Indirect evidence “IVE Group is Australia’s largest diversified marketing company.” Source: RevenueBase Database · checked Sep 21, 2026
7	DONER	Indirect evidence	Southfield, MI, United StatesHQ checked Sep 21, 2026	501-1,000	708 contacts →
	Indirect evidence “Doner unlocks all the tools of Modern marketing to build lasting connections with every day, Main Street consumers.” Source: RevenueBase Database · checked Sep 21, 2026
8	Stream Companies	Partial evidence	Malvern, PA, United StatesHQ checked Sep 21, 2026	501-1,000	572 contacts →
	Partial evidence “Stream Companies is a full service advertising agency that specializes in launching, positioning, and long term management of brands on full service contracts and a…” Source: RevenueBase Database · checked Sep 21, 2026
9	Tombras	Indirect evidence	Knoxville, TN, United StatesHQ checked Sep 21, 2026	201-500	496 contacts →
	Indirect evidence “Tombras is a 450+ person, full-service agency with a digital mindset.” Source: RevenueBase Database · checked Sep 21, 2026
10	R&r Partners	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	201-500	493 contacts →
	Indirect evidence “R&R partners isn’t our name, it’s our promise.” Source: RevenueBase Database · checked Sep 21, 2026
11	Martin	Partial evidence	Richmond, VA, United StatesHQ checked Sep 21, 2026	201-500	482 contacts →
	Partial evidence “We are a full-service agency with capabilities in advertising, strategic planning, direct response, digital, data analytics, design and branded content.” Source: RevenueBase Database · checked Sep 21, 2026
12	CLEAN	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 21, 2026	n/a	414 contacts →
	Partial evidence “We are CLEAN Advertising and Design, a full-service creative agency with over 28 years of experience delivering ideas that help build brand awareness, engage audiences, and…” Source: RevenueBase Database · checked Sep 21, 2026
13	Mullenlowe U.S	Indirect evidence	Boston, CA, United StatesHQ checked Sep 21, 2026	201-500	408 contacts →
	Indirect evidence “We are a creatively driven full-service agency committed to always being a challenger.” Source: RevenueBase Database · checked Sep 21, 2026
14	Crispin	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	405 contacts →
	Indirect evidence “Crispin is the original creative business partner, challenging the industry’s established norms on behalf of our clients to create the most outrageously effective work since 1965.” Source: RevenueBase Database · checked Sep 21, 2026
15	TAGG	Indirect evidence	São Paulo, BrazilHQ checked Sep 21, 2026	1,001-5,000	385 contacts →
	Indirect evidence “Composed of professionals working in the segment since TAGG offers complete solutions with a wide variety of Promotional Marketing services.” Source: RevenueBase Database · checked Sep 21, 2026
16	Pilot Group	Indirect evidence	Hamburg, GermanyHQ checked Sep 21, 2026	501-1,000	381 contacts →
	Indirect evidence “pilot is one of the largest independent and owner-managed agency groups in Germany.” Source: RevenueBase Database · checked Sep 21, 2026
17	Love Advertising	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	51-200	374 contacts →
	Partial evidence “Love Advertising is a leading regional full-service advertising agency based in Houston, Texas.” Source: RevenueBase Database · checked Sep 21, 2026
18	Horizon Next	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	355 contacts →
	Indirect evidence “Horizon Next is one of the industry's most innovative and data-driven marketing organizations and sits at the intersection of three constantly changing landscapes: people, data…” Source: RevenueBase Database · checked Sep 21, 2026
19	Laboratory	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 21, 2026	n/a	355 contacts →
	Indirect evidence “We develop strategic, creative solutions that aren’t afraid of challenging tradition, because the way we see it – great marketing shouldn’t have to feel like marketing.” Source: RevenueBase Database · checked Sep 21, 2026
20	MBM	Indirect evidence	Auckland, New ZealandHQ checked Sep 21, 2026	51-200	345 contacts →
	Indirect evidence “MBM was founded in 2010, and became New Zealand’s largest independent media agency with over 100 staff in its Auckland and Wellington offices.” Source: RevenueBase Database · checked Sep 21, 2026
21	ARM Worldwide	Partial evidence	Gurgaon, IndiaHQ checked Sep 21, 2026	51-200	344 contacts →
	Partial evidence “Established in 2013,#ARM Worldwide is a renowned digital advertising and marketing communications enterprise that specializes in developing and implementing digital strategies…” Source: RevenueBase Database · checked Sep 21, 2026
22	FCB Ulka	Partial evidence	IndiaHQ checked Sep 21, 2026	501-1,000	337 contacts →
	Partial evidence “FCB Ulka Advertising is the flagship agency of the FCB India Network, one of the fastest growing networks in the country.” Source: RevenueBase Database · checked Sep 21, 2026
23	Goldmine Advertising	Indirect evidence	Mumbai, IndiaHQ checked Sep 21, 2026	51-200	335 contacts →
	Indirect evidence “We are enriched with over two decades of experience.” Source: RevenueBase Database · checked Sep 21, 2026
24	Mckinney	Indirect evidence	Durham, NC, United StatesHQ checked Sep 21, 2026	201-500	328 contacts →
	Indirect evidence “McKinney is a full-service creative agency that generates unfair attention for brands.” Source: RevenueBase Database · checked Sep 21, 2026
25	Barkley	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 21, 2026	501-1,000	323 contacts →
	Indirect evidence “This page is being closed.” Source: RevenueBase Database · checked Sep 21, 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: advertising consulting services. 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 advertising consulting services.
Partial evidence: Its own public description names part of advertising consulting services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name advertising consulting services. 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 47,099 advertising consulting services worldwide

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Advertising consulting services worldwide at a glance

As of Sep 21, 2026

18.2%Verified-email coverage

6.0Average contacts per company

1-10Median size (employees)

1.1%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

32,986

11-50

11,786

51-200

1,678

201-500

402

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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among advertising consulting services, 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: Every country. Country and city lists for advertising consulting services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “advertising consulting services”. 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 advertising consulting services), 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 advertising consulting services, 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, 51,456 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 September 21, 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.

Advertising consulting services by location

168 lists · largest first

Every Advertising consulting services 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 advertising consulting services, 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 advertising consulting services are there worldwide?

RevenueBase identified 47,099 advertising consulting services worldwide as of September 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?

GREY, headquartered in New York, tops this list with the largest team on record.

Which country has the most advertising consulting services?

The United States leads with 9,351 companies, followed by India (3,551) and Brazil (2,288). Every advertising consulting services list by country and city is linked on this page.

Which city has the most advertising consulting services?

London leads with 539 headquartered companies, followed by New York (490) and Sao Paulo (476).

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 51,456 verified decision-maker contacts tracked across these 47,099 companies.

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 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.