Company lists · Data refreshed September 2026

Top 25 Big six advertising agencies based in the United States

Name: Big six advertising agencies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 9,033 companies tracked

RevenueBase identified 9,033 big six advertising agencies headquartered in the United States as of September 2026 and tracks 245,518 professional contacts across them, including 71,348 with verified work emails and 72,793 with mobile numbers. New York is the largest hub.

This list covers big six advertising agencies headquartered in the United States, 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 23, 2026.

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 23, 2026 86% judged on-target in blind review

9,033Companies

245,518Contacts tracked

71,348Verified emails

72,793Mobile numbers

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

The 25 largest big six advertising agencies based in the United States

Ranked by team size

Top 25 of 9,033 big six advertising agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big six advertising agencies: 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	VML	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	15,338 contacts →
	Indirect evidence “VML is a global powerhouse born from the unification of Wunderman Thompson and VMLY & R, two of the world's most powerful and accomplished creative agencies with complementary…” Source: RevenueBase Database · checked Sep 23, 2026
2	Ogilvy	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	12,165 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 23, 2026
3	QUAD	Indirect evidence	Sussex, WI, United StatesHQ checked Sep 23, 2026	10001+	9,567 contacts →
	Indirect evidence “Quad (NYSE: QUAD) is a global marketing experience company that helps brands make direct consumer connections, from household to in-store to online.” Source: RevenueBase Database · checked Sep 23, 2026
4	Starcom	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	5,520 contacts →
	Indirect evidence “With a history that dates back over 80 years, Starcom is a global communications planning and media leader.” Source: RevenueBase Database · checked Sep 23, 2026
5	LEO Burnett	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	5,385 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 23, 2026
6	IPG Mediabrands	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	4,963 contacts →
	Indirect evidence “IPG Mediabrands is the media and marketing solutions division of Interpublic Group (NYSE: IPG).” Source: RevenueBase Database · checked Sep 23, 2026
7	Omnicom Media Group	Indirect evidence	New York, United StatesHQ checked Sep 23, 2026	10001+	3,989 contacts →
	Indirect evidence “Omnicom Media Group (OMG), the media services division of Omnicom Group Inc, delivers transformational experiences for consumers, clients, and talent.” Source: RevenueBase Database · checked Sep 23, 2026
8	Mccann Worldgroup	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	3,874 contacts →
	Indirect evidence “McCann Worldgroup, part of the Interpublic Group (NYSE: IPG), is the irrefutable leader in the business of creativity.” Source: RevenueBase Database · checked Sep 23, 2026
9	SGK	Indirect evidence	Des Plaines, IL, United StatesHQ checked Sep 23, 2026	5,001-10,000	3,587 contacts →
	Indirect evidence “SGK, part of the Propelis Group, is a global brand and content production agency.” Source: RevenueBase Database · checked Sep 23, 2026
10	Thompson	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	5,001-10,000	3,574 contacts →
	Indirect evidence “J.” Source: RevenueBase Database · checked Sep 23, 2026
11	Initiative	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	5,001-10,000	2,980 contacts →
	Indirect evidence “Initiative unlocks business growth for the world’s most ambitious brands.” Source: RevenueBase Database · checked Sep 23, 2026
12	Spark Foundry	Indirect evidence	NY, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,822 contacts →
	Indirect evidence “As one of the fastest-growing global media agency networks, Spark Foundry is not beholden to legacy.” Source: RevenueBase Database · checked Sep 23, 2026
13	Digitas North America	Indirect evidence	Boston, MA, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,654 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 23, 2026
14	GREY	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 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 23, 2026
15	OMD	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	2,639 contacts →
	Indirect evidence “OMD is the world’s largest media network, with more than people working across more than 100 countries.” Source: RevenueBase Database · checked Sep 23, 2026
16	Publicis	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,531 contacts →
	Indirect evidence “You can either adapt to change, ignore it or lead it.” Source: RevenueBase Database · checked Sep 23, 2026
17	Horizon Media	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 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 23, 2026
18	Assembly Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,313 contacts →
	Indirect evidence “Assembly is a global omnichannel agency built for brands that want a more modern approach to building brands that perform.” Source: RevenueBase Database · checked Sep 23, 2026
19	R GA	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	1,001-5,000	2,189 contacts →
	Indirect evidence “R/GA is an independent creative innovation company for the intelligence age.” Source: RevenueBase Database · checked Sep 23, 2026
20	UM Worldwide	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,981 contacts →
	Indirect evidence “Our Stand Against Bland approach creates limitless possibilities, making everything we do intelligently driven, diversely courageous, business- and brand-obsessed, and dedicated…” Source: RevenueBase Database · checked Sep 23, 2026
21	Wunderman Thompson	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	1,870 contacts →
	Indirect evidence “Part creative agency, part consultancy and part technology company, we inspire growth for ambitious brands.” Source: RevenueBase Database · checked Sep 23, 2026
22	Omnicom	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 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 23, 2026
23	Wieden Kennedy	Indirect evidence	Portland, OR, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,711 contacts →
	Indirect evidence “Wieden+Kennedy is an independent, global creative company that has built and transformed some of the world’s most well-known, exciting brands for over forty years.” Source: RevenueBase Database · checked Sep 23, 2026
24	TMS	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 23, 2026	1,001-5,000	1,688 contacts →
	Indirect evidence “tms unites technology and marketing and sourcing to drive transformational change for the world’s leading brands.” Source: RevenueBase Database · checked Sep 23, 2026
25	Young & Rubicam	Indirect evidence	New York, NY, United StatesHQ checked Sep 23, 2026	10001+	1,602 contacts →
	Indirect evidence “Y&R is a leading global marketing communications company, with more than 189 offices in 90+ countries.” Source: RevenueBase Database · checked Sep 23, 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: big six advertising agencies. 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 big six advertising agencies.
Partial evidence: Its own public description names part of big six advertising agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big six advertising agencies. 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 9,033 big six advertising agencies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 71,348 reachable decision-makers.

Free signup · no credit card

View the full list →

Big six advertising agencies based in the United States at a glance

As of Sep 23, 2026

29.1%Verified-email coverage

29.6%Mobile-number coverage

27.2Average contacts per company

1-10Median size (employees)

9.5%Largest-city concentration · New York

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

5,671

11-50

2,597

51-200

533

201-500

117

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 25.0d

53,9240–30

15,82331–60

1,00661–90

5190–180

544180+

Company record updated

Median 86.0d

00–30

60,55631–60

105,54961–90

63,93790–180

15,476180+

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 big six advertising agencies, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “big six advertising agencies”. 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 big six advertising agencies), 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 big six advertising agencies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 71,348 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 23, 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.

Big six advertising agencies by metro

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 big six advertising agencies, 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 big six advertising agencies are there based in the United States?

RevenueBase identified 9,033 big six advertising agencies headquartered in the United States 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?

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

Which city has the most big six advertising agencies?

New York leads with 855 headquartered companies, followed by Los Angeles (498) and Miami (229).

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 71,348 verified decision-maker contacts tracked across these 9,033 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 23, 2026.

Ready to reach these companies? Verified emails and direct dials for all 9,033 big six advertising agencies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Big six advertising agencies by geography

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 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.