Company lists · Data refreshed September 2026

Top 25 Adtech and martech companies worldwide

Name: Adtech and martech companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 17,347 companies tracked

RevenueBase identified 17,347 adtech and martech companies worldwide as of September 2026 and tracks 256,738 professional contacts across them, including 72,226 with verified work emails. The United States is the largest market and London the largest hub.

This list covers adtech and martech companies 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 27, 2026. Country and city lists for adtech and martech companies 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 27, 2026 86% judged on-target in blind review

17,347Companies

256,738Contacts tracked

72,226Verified emails

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The 25 largest adtech and martech companies worldwide

Ranked by team size

Top 25 of 17,347 adtech and martech companies worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to adtech and martech companies: 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	Epsilon	Indirect evidence	Irving, TX, United StatesHQ checked Sep 27, 2026	5,001-10,000	9,953 contacts →
	Indirect evidence “Epsilon is a global leader in data and identity with deep expertise in digital media, clean rooms, customer data platforms, loyalty and marketing services.” Source: RevenueBase Database · checked Sep 27, 2026
2	Publicis Media	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	10001+	6,901 contacts →
	Indirect evidence “Publicis Media harnesses the power of modern media through leading agency brands Dysrupt, Infinite Roar, Publicis Collective, Publicis Health Media, Spark Foundry, Starcom and…” Source: RevenueBase Database · checked Sep 27, 2026
3	HIBU	Indirect evidence	Cedar Rapids, IA, United StatesHQ checked Sep 27, 2026	1,001-5,000	4,426 contacts →
	Indirect evidence “Hibu is a leading provider of technology-driven, integrated digital marketing solutions for America’s local businesses, trusted by tens of thousands of local business owners.” Source: RevenueBase Database · checked Sep 27, 2026
4	PHD	Indirect evidence	Bankside, GermanyHQ checked Sep 27, 2026	1,001-5,000	4,068 contacts →
	Indirect evidence “Welcome to PHD.” Source: RevenueBase Database · checked Sep 27, 2026
5	Zoominfo	Indirect evidence	Vancouver, WA, United StatesHQ checked Sep 27, 2026	1,001-5,000	4,029 contacts →
	Indirect evidence “ZoomInfo (NASDAQ: GTM) is the go-to-market platform that helps businesses find, acquire and grow their customers.” Source: RevenueBase Database · checked Sep 27, 2026
6	Xdbs Worldwide	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 27, 2026	1,001-5,000	3,498 contacts →
	Indirect evidence “At XDBS, we primarily work with media agencies, publishers and marketing companies looking to leverage marketing automation and digital marketing capacity and capability to…” Source: RevenueBase Database · checked Sep 27, 2026
7	Zeta Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,595 contacts →
	Indirect evidence “At Zeta Global (NYSE: ZETA), we help enterprise brands and agencies Achieve the Impossible™ with superintelligent marketing.” Source: RevenueBase Database · checked Sep 27, 2026
8	Best Version Media	Indirect evidence	Brookfield, WI, United StatesHQ checked Sep 27, 2026	n/a	2,416 contacts →
	Indirect evidence “Best Version Media simplifies local marketing by offering small and midsize businesses a complete mix of solutions to keep them top-of-mind, from community magazine ads to digital…” Source: RevenueBase Database · checked Sep 27, 2026
9	Jellyfish	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	2,119 contacts →
	Indirect evidence “Jellyfish \| Move Faster.” Source: RevenueBase Database · checked Sep 27, 2026
10	media.net	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 27, 2026	1,001-5,000	2,011 contacts →
	Indirect evidence “Media.net is an independent advertising technology platform that helps publishers, advertisers, and agencies achieve measurable outcomes across all formats and mediums.” Source: RevenueBase Database · checked Sep 27, 2026
11	Taboola	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,979 contacts →
	Indirect evidence “Taboola empowers businesses to grow through performance advertising technology that goes beyond search and social and delivers measurable outcomes at scale.” Source: RevenueBase Database · checked Sep 27, 2026
12	TEADS	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,789 contacts →
	Indirect evidence “Teads Holding Co.(“Teads”)(Nasdaq: TEAD) is a leading omnichannel advertising platform focused on driving outcomes for brand and performance advertisers across screens.” Source: RevenueBase Database · checked Sep 27, 2026
13	Bluefocus	Indirect evidence	Chaoyang District, ChinaHQ checked Sep 27, 2026	1,001-5,000	1,668 contacts →
	Indirect evidence “BlueFocus Communication Group (SZSE: is one of the world’s top marketing communications groups and China’s largest overseas marketing company, empowering businesses with…” Source: RevenueBase Database · checked Sep 27, 2026
14	Stackadapt	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 27, 2026	1,001-5,000	1,633 contacts →
	Indirect evidence “StackAdapt is the leading technology company that empowers marketers to reach, engage, and convert audiences with precision.” Source: RevenueBase Database · checked Sep 27, 2026
15	Constant Contact	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,611 contacts →
	Indirect evidence “We deliver for small businesses with powerful tools to simplify and amplify digital marketing.” Source: RevenueBase Database · checked Sep 27, 2026
16	Localiq	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,534 contacts →
	Indirect evidence “Grow your business with digital marketing powered by AI and local expertise.” Source: RevenueBase Database · checked Sep 27, 2026
17	Appsflyer	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,516 contacts →
	Indirect evidence “AppsFlyer is the Modern Marketing Cloud that helps businesses transform complex data into clarity and growth.” Source: RevenueBase Database · checked Sep 27, 2026
18	Intuit Mailchimp	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,483 contacts →
	Indirect evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 27, 2026
19	Pubmatic	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 27, 2026	501-1,000	1,297 contacts →
	Indirect evidence “PubMatic is the leading AI-powered ad tech company delivering digital advertising performance.” Source: RevenueBase Database · checked Sep 27, 2026
20	Freewheel	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,273 contacts →
	Indirect evidence “FreeWheel’s TV and video advertising technology is built for today’s ever-evolving multiscreen ecosystem.” Source: RevenueBase Database · checked Sep 27, 2026
21	Centro	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 27, 2026	501-1,000	1,178 contacts →
	Indirect evidence “Basis Technologies is a global provider of workflow automation, intelligence and programmatic trading software for the marketing enterprise.” Source: RevenueBase Database · checked Sep 27, 2026
22	Demandscience	Indirect evidence	Boston, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,087 contacts →
	Indirect evidence “With proprietary data and omni-channel activation like events, content, programmatic and chat, we cut through the noise to reach entire buyer groups, driving engagement and impact…” Source: RevenueBase Database · checked Sep 27, 2026
23	Scorpion	Indirect evidence	Draper, UT, United StatesHQ checked Sep 27, 2026	501-1,000	1,076 contacts →
	Indirect evidence “Scorpion is the leader in helping local businesses succeed by focusing on what truly matters-driving revenue.” Source: RevenueBase Database · checked Sep 27, 2026
24	Centerfield	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,063 contacts →
	Indirect evidence “Super-powered customer acquisition.” Source: RevenueBase Database · checked Sep 27, 2026
25	Mediaocean	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,050 contacts →
	Indirect evidence “Mediaocean is powering the future of the advertising ecosystem with technology that empowers brands and agencies to deliver impactful omnichannel marketing experiences.” Source: RevenueBase Database · checked Sep 27, 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: adtech and martech companies. 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 adtech and martech companies.
Partial evidence: Its own public description names part of adtech and martech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name adtech and martech companies. 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 17,347 adtech and martech companies worldwide

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Adtech and martech companies worldwide at a glance

As of Sep 27, 2026

28.1%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

9,756

11-50

5,440

51-200

1,481

201-500

399

501-1,000

116

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 adtech and martech companies, 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 adtech and martech companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “adtech and martech companies”. 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 adtech and martech companies), 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 adtech and martech companies, 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, 72,226 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 27, 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.

Adtech and martech companies by location

88 lists · largest first

Every Adtech and martech companies 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 adtech and martech companies, 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 adtech and martech companies are there worldwide?

RevenueBase identified 17,347 adtech and martech companies 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?

Epsilon, headquartered in Irving, tops this list with the largest team on record.

Which country has the most adtech and martech companies?

The United States leads with 3,521 companies, followed by India (2,153) and Brazil (721). Every adtech and martech companies list by country and city is linked on this page.

Which city has the most adtech and martech companies?

London leads with 355 headquartered companies, followed by New York (318) and Dubai (225).

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 72,226 verified decision-maker contacts tracked across these 17,347 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 27, 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.