Company lists · Data refreshed September 2026

Top 25 Adtech companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 17,360 companies tracked

RevenueBase identified 17,360 adtech companies worldwide as of September 2026 and tracks 268,279 professional contacts across them, including 87,711 with verified work emails. The United States is the largest market and New York the largest hub.

This list covers adtech 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 21, 2026. Country and city lists for adtech 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 21, 2026 86% judged on-target in blind review

17,360Companies

268,279Contacts tracked

87,711Verified emails

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The 25 largest adtech companies worldwide

Ranked by team size

Top 25 of 17,360 adtech companies worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to adtech 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 21, 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 21, 2026
2	Publicis Media	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
3	The Trade Desk	Indirect evidence	Ventura, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	4,307 contacts →
	Indirect evidence “It's more than just clicks.” Source: RevenueBase Database · checked Sep 21, 2026
4	Acxiom	Indirect evidence	Conway, AR, United StatesHQ checked Sep 21, 2026	1,001-5,000	3,241 contacts →
	Indirect evidence “Acxiom puts data to work, solving complex challenges for the world’s leading brands and agencies.” Source: RevenueBase Database · checked Sep 21, 2026
5	Zeta Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
6	media.net	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 21, 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 21, 2026
7	ALEPH	Indirect evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,980 contacts →
	Indirect evidence “Aleph is a global leader accelerating digital advertising, and fintech solutions across more than 130 high-growth markets.” Source: RevenueBase Database · checked Sep 21, 2026
8	Taboola	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
9	TEADS	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
10	Stackadapt	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 21, 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 21, 2026
11	Informa Techtarget	Indirect evidence	Newton, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,384 contacts →
	Indirect evidence “Informa TechTarget informs, influences and connects the world’s technology buyers and sellers, helping accelerate growth from R&D to ROI.” Source: RevenueBase Database · checked Sep 21, 2026
12	RTB House	Indirect evidence	Warsaw, PolandHQ checked Sep 21, 2026	1,001-5,000	1,353 contacts →
	Indirect evidence “RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help brands grow.” Source: RevenueBase Database · checked Sep 21, 2026
13	Doubleverify	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	1,318 contacts →
	Indirect evidence “DoubleVerify is a leading software platform for digital media measurement and analytics.” Source: RevenueBase Database · checked Sep 21, 2026
14	Pubmatic	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 21, 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 21, 2026
15	Freewheel	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
16	Mediaocean	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
17	Quinstreet	Indirect evidence	Foster City, CA, United StatesHQ checked Sep 21, 2026	501-1,000	1,035 contacts →
	Indirect evidence “Powering Performance Marketplaces In Digital Media QuinStreet is a pioneer in powering decentralized online marketplaces that match searchers and “research and compare” consumers…” Source: RevenueBase Database · checked Sep 21, 2026
18	Samsung ADS	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	985 contacts →
	Indirect evidence “Samsung Ads is Samsung Electronics’ advertising ecosystem, spanning hundreds of millions of smart devices across TV, mobile, desktop, and beyond.” Source: RevenueBase Database · checked Sep 21, 2026
19	Integral AD Science	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	966 contacts →
	Indirect evidence “Integral Ad Science is a leading global media measurement and optimization platform that delivers the industry’s most actionable data to drive superior results for the world’s…” Source: RevenueBase Database · checked Sep 21, 2026
20	Magnite	Indirect evidence	United StatesHQ checked Sep 21, 2026	501-1,000	910 contacts →
	Indirect evidence “We’re Magnite (NASDAQ: MGNI), the world’s largest independent sell-side advertising company.” Source: RevenueBase Database · checked Sep 21, 2026
21	Moloco	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 21, 2026	501-1,000	893 contacts →
	Indirect evidence “Moloco’s mission is to be the scaling engine for the internet economy, applying AI to help businesses of all sizes grow.” Source: RevenueBase Database · checked Sep 21, 2026
22	BASIS	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	891 contacts →
	Indirect evidence “Basis is a global provider of media automation and programmatic advertising software and services for enterprises.” Source: RevenueBase Database · checked Sep 21, 2026
23	Adform	Indirect evidence	Copenhagen, DenmarkHQ checked Sep 21, 2026	501-1,000	847 contacts →
	Indirect evidence “Adform is the most powerful and safe media buying platform in the world.” Source: RevenueBase Database · checked Sep 21, 2026
24	KARGO	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	843 contacts →
	Indirect evidence “Kargo creates memorable experiences for advertisers that go beyond the first impression to captivate consumer attention.” Source: RevenueBase Database · checked Sep 21, 2026
25	Smartly	Indirect evidence	Helsinki, FinlandHQ checked Sep 21, 2026	501-1,000	827 contacts →
	Indirect evidence “Smartly is the AI-powered advertising technology company transforming ad experiences for brands and their consumers.” 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: adtech 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 companies.
Partial evidence: Its own public description names part of adtech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name adtech 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 17,360 adtech companies worldwide

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Adtech companies worldwide at a glance

As of Sep 21, 2026

32.7%Verified-email coverage

15.5Average contacts per company

11-50Median size (employees)

3.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

8,529

11-50

6,348

51-200

1,784

201-500

439

501-1,000

115

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 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 companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “adtech 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 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 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, 87,711 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.

Adtech companies by location

86 lists · largest first

Every Adtech 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 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 companies are there worldwide?

RevenueBase identified 17,360 adtech 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 companies?

The United States leads with 3,512 companies, followed by India (1,528) and the United Kingdom (776). Every adtech companies list by country and city is linked on this page.

Which city has the most adtech companies?

New York leads with 554 headquartered companies, followed by London (516) and Singapore (249).

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 87,711 verified decision-maker contacts tracked across these 17,360 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.