Company lists · Data refreshed September 2026

Top 25 Ad tech data providers worldwide

Name: Ad tech data providers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 7,745 companies tracked

RevenueBase identified 7,745 ad tech data providers worldwide as of September 2026 and tracks 173,785 professional contacts across them, including 63,592 with verified work emails. The United States is the largest market and New York the largest hub.

This list covers ad tech data providers 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 19, 2026. Country and city lists for ad tech data providers 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 19, 2026 86% judged on-target in blind review

7,745Companies

173,785Contacts tracked

63,592Verified emails

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The 25 largest ad tech data providers worldwide

Ranked by team size

Top 25 of 7,745 ad tech data providers worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to ad tech data providers: 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	Partial evidence	Irving, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	9,953 contacts →
	Partial 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 19, 2026
2	Publicis Media	Indirect evidence	London, United KingdomHQ checked Sep 19, 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 19, 2026
3	The Trade Desk	Indirect evidence	Ventura, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	4,307 contacts →
	Indirect evidence “It's more than just clicks.” Source: RevenueBase Database · checked Sep 19, 2026
4	PHD	Indirect evidence	Bankside, GermanyHQ checked Sep 19, 2026	1,001-5,000	4,068 contacts →
	Indirect evidence “Welcome to PHD.” Source: RevenueBase Database · checked Sep 19, 2026
5	Dynata	Partial evidence	Westport, CT, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,807 contacts →
	Partial evidence “At Dynata, we deliver the highest quality first-party data to help businesses around the world gain precise insights, activate the right audiences, and confidently measure impact.” Source: RevenueBase Database · checked Sep 19, 2026
6	Acxiom	Partial evidence	Conway, AR, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,241 contacts →
	Partial evidence “Acxiom puts data to work, solving complex challenges for the world’s leading brands and agencies.” Source: RevenueBase Database · checked Sep 19, 2026
7	Zeta Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
8	media.net	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 19, 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 19, 2026
9	Taboola	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
10	TEADS	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
11	Similarweb	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,351 contacts →
	Partial evidence “We power businesses with the best digital data.” Source: RevenueBase Database · checked Sep 19, 2026
12	Doubleverify	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
13	Pubmatic	Strong evidence	Redwood City, CA, United StatesHQ checked Sep 19, 2026	501-1,000	1,297 contacts →
	Strong evidence “PubMatic is the leading AI-powered ad tech company delivering digital advertising performance.” Source: RevenueBase Database · checked Sep 19, 2026
14	Freewheel	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
15	Comscore, INC	Indirect evidence	Reston, VA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,269 contacts →
	Indirect evidence “Comscore (NASDAQ: SCOR) is a global, trusted partner for planning, transacting and evaluating media across platforms.” Source: RevenueBase Database · checked Sep 19, 2026
16	Mediaocean	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
17	Integral AD Science	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	966 contacts →
	Strong 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 19, 2026
18	Magnite	Indirect evidence	United StatesHQ checked Sep 19, 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 19, 2026
19	Moloco	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 19, 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 19, 2026
20	Adform	Indirect evidence	Copenhagen, DenmarkHQ checked Sep 19, 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 19, 2026
21	KARGO	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
22	Smartly	Partial evidence	Helsinki, FinlandHQ checked Sep 19, 2026	501-1,000	827 contacts →
	Partial evidence “Smartly is the AI-powered advertising technology company transforming ad experiences for brands and their consumers.” Source: RevenueBase Database · checked Sep 19, 2026
23	Mediaplus Group	Indirect evidence	Munich, GermanyHQ checked Sep 19, 2026	1,001-5,000	820 contacts →
	Indirect evidence “Mediaplus is one of Europe’s largest independent, partner-owned media agencies.” Source: RevenueBase Database · checked Sep 19, 2026
24	Azerion	Indirect evidence	Schiphol-rijk, GermanyHQ checked Sep 19, 2026	1,001-5,000	808 contacts →
	Indirect evidence “Founded in 2014, Azerion (EURONEXT: AZRN) is one of Europe’s largest digital advertising and entertainment media platforms.” Source: RevenueBase Database · checked Sep 19, 2026
25	Kepler	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	738 contacts →
	Indirect evidence “We’re on a mission to clarify the digital universe.” Source: RevenueBase Database · checked Sep 19, 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: ad tech data providers. 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 ad tech data providers.
Partial evidence: Its own public description names part of ad tech data providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ad tech data providers. 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 7,745 ad tech data providers worldwide

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Ad tech data providers worldwide at a glance

As of Sep 19, 2026

36.6%Verified-email coverage

22.4Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

3,358

11-50

3,032

51-200

975

201-500

225

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 ad tech data providers, 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 ad tech data providers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “ad tech data providers”. 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 ad tech data providers), 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 ad tech data providers, 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, 63,592 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 19, 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.

Ad tech data providers by location

51 lists · largest first

Every Ad tech data providers 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 ad tech data providers, 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 ad tech data providers are there worldwide?

RevenueBase identified 7,745 ad tech data providers 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 ad tech data providers?

The United States leads with 1,821 companies, followed by India (727) and the United Kingdom (377). Every ad tech data providers list by country and city is linked on this page.

Which city has the most ad tech data providers?

New York leads with 296 headquartered companies, followed by London (249) and Singapore (132).

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 63,592 verified decision-maker contacts tracked across these 7,745 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 19, 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.