Company lists · Data refreshed September 2026

Top 25 First party data marketing agencies worldwide

Name: First party data marketing agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 6,901 companies tracked

RevenueBase identified 6,901 first party data marketing agencies worldwide as of September 2026 and tracks 131,689 professional contacts across them, including 44,839 with verified work emails. The United States is the largest market and London the largest hub.

This list covers first party data marketing agencies 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 28, 2026. Country and city lists for first party data marketing agencies 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 28, 2026 86% judged on-target in blind review

6,901Companies

131,689Contacts tracked

44,839Verified emails

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The 25 largest first party data marketing agencies worldwide

Ranked by team size

Top 25 of 6,901 first party data marketing agencies worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to first party data marketing 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	Kantar	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	15,564 contacts →
	Strong evidence “Kantar is the world’s leading marketing data and analytics business.” Source: RevenueBase Database · checked Sep 28, 2026
2	Epsilon	Strong evidence	Irving, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	9,953 contacts →
	Strong 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 28, 2026
3	Dynata	Strong evidence	Westport, CT, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,807 contacts →
	Strong 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 28, 2026
4	Acxiom	Partial evidence	Conway, AR, United StatesHQ checked Sep 28, 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 28, 2026
5	Kinesso	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,860 contacts →
	Partial evidence “KINESSO is the technology-driven performance marketing agency within Omnicom Media that provides actionable growth for both agency partners and clients.” Source: RevenueBase Database · checked Sep 28, 2026
6	Zeta Global	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,595 contacts →
	Partial evidence “At Zeta Global (NYSE: ZETA), we help enterprise brands and agencies Achieve the Impossible™ with superintelligent marketing.” Source: RevenueBase Database · checked Sep 28, 2026
7	Caci LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,663 contacts →
	Strong evidence “CACI offers an unrivalled range of data, marketing and IT solutions to a wide range of industries across both the public and private sectors.” Source: RevenueBase Database · checked Sep 28, 2026
8	Hearts & Science	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,359 contacts →
	Partial evidence “Hearts & Science, an Omnicom Media Group agency, transforms data signals into meaningful connections between brands and consumers that drive exponential growth.” Source: RevenueBase Database · checked Sep 28, 2026
9	Annalect	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,327 contacts →
	Strong evidence “Over a decade ago, Omnicom created Annalect to reimagine the future of marketing, at the crossroads of data, tech, analytics, and AI.” Source: RevenueBase Database · checked Sep 28, 2026
10	Dialog Direct	Strong evidence	Highland Park, MI, United StatesHQ checked Sep 28, 2026	10001+	1,138 contacts →
	Strong evidence “Dialog Direct helps brands manage and personalize their multichannel, multi-touch customer journeys using data-driven marketing and customer engagement solutions.” Source: RevenueBase Database · checked Sep 28, 2026
11	Data Axle	Partial evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,088 contacts →
	Partial evidence “Data Axle helps clients create a foundation of clean data, find new leads, develop winning strategies, design beautiful campaigns, and can handle all day-to-day execution needs” Source: RevenueBase Database · checked Sep 28, 2026
12	Insider	Partial evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	1,001-5,000	1,036 contacts →
	Partial evidence “Insider-one platform for individualized, cross-channel experiences-enables enterprise marketers to connect customer data across channels and systems, predict their future behavior…” Source: RevenueBase Database · checked Sep 28, 2026
13	SEM	Partial evidence	Sariyer, TürkiyeHQ checked Sep 28, 2026	n/a	883 contacts →
	Partial evidence “SEM is a global new generation consumer marketing and technologies brand where we combine growth consultancy, advanced analytics, digital marketing and technology services under…” Source: RevenueBase Database · checked Sep 28, 2026
14	Manlitics B2B Ites	Partial evidence	New York, United StatesHQ checked Sep 28, 2026	501-1,000	750 contacts →
	Partial evidence “In an ERA of new and emerging digital mediums, we align our core expertise of today’s ever-changing technology with a clear understanding of traditional marketing methods without…” Source: RevenueBase Database · checked Sep 28, 2026
15	Anteriad	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	740 contacts →
	Partial evidence “Data Driven.” Source: RevenueBase Database · checked Sep 28, 2026
16	Movable INK	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	672 contacts →
	Partial evidence “Movable Ink helps marketers create more relevant customer experiences across email, mobile, and web through data activation, AI-powered decisioning, and personalization at scale.” Source: RevenueBase Database · checked Sep 28, 2026
17	Vertis Communications	Indirect evidence	Sussex, WI, United StatesHQ checked Sep 28, 2026	10001+	605 contacts →
	Indirect evidence “Vertis Communications was acquired by Quad/Graphics in January 2013.” Source: RevenueBase Database · checked Sep 28, 2026
18	Tealium	Partial evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	501-1,000	588 contacts →
	Partial evidence “Tealium helps companies collect, govern, and enrich their customer data in real-time to power AI initiatives and delight customers in the moments that matter.” Source: RevenueBase Database · checked Sep 28, 2026
19	Belltech	Indirect evidence	Las Condes, ChileHQ checked Sep 28, 2026	201-500	579 contacts →
	Indirect evidence “Belltech te ayuda a entender el comportamiento de tus clientes impulsado por una estrategia basada en los datos, para poder entregar experiencias que sean personalizadas…” Source: RevenueBase Database · checked Sep 28, 2026
20	Analytic Partners	Indirect evidence	Miami, FL, United StatesHQ checked Sep 28, 2026	501-1,000	558 contacts →
	Indirect evidence “Analytic Partners is the leader in Commercial Analytics.” Source: RevenueBase Database · checked Sep 28, 2026
21	ALC	Strong evidence	Princeton, NJ, United StatesHQ checked Sep 28, 2026	51-200	539 contacts →
	Strong evidence “Founded in 1978, ALC has grown to become one of the industry's leading privately-held providers of first-party data, mailer and catalog services.” Source: RevenueBase Database · checked Sep 28, 2026
22	Precis	Partial evidence	Stockholm, SwedenHQ checked Sep 28, 2026	201-500	535 contacts →
	Partial evidence “Precis is a modern, tech-powered digital marketing agency specialising in media buying, analytics, creative, and proprietary technology.” Source: RevenueBase Database · checked Sep 28, 2026
23	Wunderkind	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	521 contacts →
	Partial evidence “Wunderkind is pioneering a new category of AI agentic marketing decisioning, where identity meets AI to drive scalable performance across channel.” Source: RevenueBase Database · checked Sep 28, 2026
24	Amsive	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	488 contacts →
	Strong evidence “Amsive is a data-driven performance marketing agency that enhances marketing ROI through innovative customer acquisition and engagement solutions.” Source: RevenueBase Database · checked Sep 28, 2026
25	YES Marketing	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	483 contacts →
	Partial evidence “Yes Marketing focuses on enabling marketers to engage, acquire and retain consumers along each stage of the consumer journey with a brand – from awareness through consideration…” Source: RevenueBase Database · checked Sep 28, 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: first party data marketing 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 first party data marketing agencies.
Partial evidence: Its own public description names part of first party data marketing agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name first party data marketing 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 6,901 first party data marketing agencies worldwide

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First party data marketing agencies worldwide at a glance

As of Sep 28, 2026

34.0%Verified-email coverage

19.1Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

3,907

11-50

2,163

51-200

593

201-500

138

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 first party data marketing 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.
Coverage: Every country. Country and city lists for first party data marketing agencies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “first party data marketing 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 first party data marketing 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 first party data marketing agencies, 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, 44,839 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 28, 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.

First party data marketing agencies by location

51 lists · largest first

Every First party data marketing agencies 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 first party data marketing 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 first party data marketing agencies are there worldwide?

RevenueBase identified 6,901 first party data marketing agencies 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?

Kantar, headquartered in London, tops this list with the largest team on record.

Which country has the most first party data marketing agencies?

The United States leads with 1,993 companies, followed by India (588) and the United Kingdom (408). Every first party data marketing agencies list by country and city is linked on this page.

Which city has the most first party data marketing agencies?

London leads with 176 headquartered companies, followed by New York (158) and Sao Paulo (93).

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 44,839 verified decision-maker contacts tracked across these 6,901 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 28, 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.