Company lists · Data refreshed September 2026

Top 25 Online display advertising companies based in the United States

Name: Online display advertising companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 4,324 companies tracked

RevenueBase identified 4,324 online display advertising companies headquartered in the United States as of September 2026 and tracks 51,970 professional contacts across them, including 20,794 with verified work emails. New York is the largest hub.

This list covers online display advertising companies 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 21, 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 21, 2026 86% judged on-target in blind review

4,324Companies

51,970Contacts tracked

20,794Verified emails

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The 25 largest online display advertising companies based in the United States

Ranked by team size

Top 25 of 4,324 online display advertising companies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to online display advertising 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	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
2	Taboola	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,979 contacts →
	Partial 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
3	TEADS	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,789 contacts →
	Partial 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
4	Pubmatic	Partial evidence	Redwood City, CA, United StatesHQ checked Sep 21, 2026	501-1,000	1,297 contacts →
	Partial evidence “PubMatic is the leading AI-powered ad tech company delivering digital advertising performance.” Source: RevenueBase Database · checked Sep 21, 2026
5	Mediaocean	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,050 contacts →
	Partial 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
6	Logical Position	Indirect evidence	Lake Oswego, OR, United StatesHQ checked Sep 21, 2026	501-1,000	899 contacts →
	Indirect evidence “Logical Position (LP) is an Inc.” Source: RevenueBase Database · checked Sep 21, 2026
7	NP Digital	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	866 contacts →
	Indirect evidence “Neil Patel has been recognized by the Wall Street Journal, Forbes, and the United Nations, to name a few, as one of the most influential and successful marketers and entrepreneurs…” Source: RevenueBase Database · checked Sep 21, 2026
8	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
9	Innovid	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	640 contacts →
	Indirect evidence “Innovid is the leading independent ad tech platform, empowering marketers to create, deliver, measure, and optimize ad-supported experiences that people love.” Source: RevenueBase Database · checked Sep 21, 2026
10	Tombras	Indirect evidence	Knoxville, TN, United StatesHQ checked Sep 21, 2026	201-500	496 contacts →
	Indirect evidence “Tombras is a 450+ person, full-service agency with a digital mindset.” Source: RevenueBase Database · checked Sep 21, 2026
11	Quantcast	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	501-1,000	491 contacts →
	Indirect evidence “Quantcast is the AI-powered ad platform built for performance marketers.” Source: RevenueBase Database · checked Sep 21, 2026
12	Affinity Global	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	446 contacts →
	Indirect evidence “Affinity is a leading global AdTech company, empowering publishers to maximize revenue and enabling advertisers to reach their ideal audiences.” Source: RevenueBase Database · checked Sep 21, 2026
13	VERVE	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	436 contacts →
	Partial evidence “Verve is a global leading advertising technology company, connecting advertisers seeking to buy digital ad space with publishers monetizing their content.” Source: RevenueBase Database · checked Sep 21, 2026
14	Viant Technology	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	201-500	418 contacts →
	Partial evidence “Viant Technology Inc.(NASDAQ: DSP) is a leader in AI-powered programmatic advertising, dedicated to driving innovation in digital marketing.” Source: RevenueBase Database · checked Sep 21, 2026
15	Triplelift	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	402 contacts →
	Partial evidence “TripleLift is the Creative SSP that transforms digital advertising through creative technology and innovative ad formats.” Source: RevenueBase Database · checked Sep 21, 2026
16	Unified	Indirect evidence	NY, United StatesHQ checked Sep 21, 2026	201-500	399 contacts →
	Indirect evidence “A best in class team of digital experts leveraging purpose built technology to deliver operational excellence and insights across paid social, programmatic, OTT and digital audio.” Source: RevenueBase Database · checked Sep 21, 2026
17	Localedge	Strong evidence	Buffalo, NY, United StatesHQ checked Sep 21, 2026	501-1,000	383 contacts →
	Strong evidence “LocalEdge, a Hearst Media Services Company, offers a full suite of online advertising products and services for any size business and budget across the country.” Source: RevenueBase Database · checked Sep 21, 2026
18	Databeat	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 21, 2026	201-500	357 contacts →
	Indirect evidence “At DataBeat, we redefine what's possible in AdTech, simplifying AdTech complexities into actionable strategies that drive revenue.” Source: RevenueBase Database · checked Sep 21, 2026
19	Inmarket	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	201-500	319 contacts →
	Indirect evidence “InMarket is the outcome intelligence platform built for marketers who demand results over proxy metrics.” Source: RevenueBase Database · checked Sep 21, 2026
20	Harmelin Media	Indirect evidence	Bala Cynwyd, PA, United StatesHQ checked Sep 21, 2026	201-500	292 contacts →
	Indirect evidence “Harmelin Media specializes in full-funnel performance media and marketing solutions and has more than 40 years of experience helping clients navigate the rapidly changing…” Source: RevenueBase Database · checked Sep 21, 2026
21	Marin Software	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 21, 2026	201-500	284 contacts →
	Indirect evidence “Marin was acquired by Trilogy / ESW Capital in 2025.” Source: RevenueBase Database · checked Sep 21, 2026
22	Accel Digital AD Operations	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	251 contacts →
	Partial evidence “Welcome to Accel-Digital, a leading brand in the Marketing and Advertising industry that offers top-notch assistance with ad operations support services.” Source: RevenueBase Database · checked Sep 21, 2026
23	Admedia	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	201-500	242 contacts →
	Indirect evidence “AdMedia helps Agencies and Brands meet their KPIs and hit their ROI objectives.” Source: RevenueBase Database · checked Sep 21, 2026
24	Onmedia	Partial evidence	West Des Moines, IA, United StatesHQ checked Sep 21, 2026	51-200	223 contacts →
	Partial evidence “OnMedia utilizes the most advanced technology for targeted digital and TV advertising.” Source: RevenueBase Database · checked Sep 21, 2026
25	Mediavine	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	213 contacts →
	Indirect evidence “Mediavine powers monetization for independent publishers, delivering the technology, demand infrastructure, and revenue performance that digital businesses need to grow.” 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: online display advertising 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 online display advertising companies.
Partial evidence: Its own public description names part of online display advertising companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name online display advertising 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 4,324 online display advertising companies based in the United States

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Online display advertising companies based in the United States at a glance

As of Sep 21, 2026

40.0%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

7.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

2,715

11-50

1,214

51-200

278

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,324 companies.

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 online display advertising 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “online display advertising 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 online display advertising 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 online display advertising companies, 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, 20,794 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.

Online display advertising companies 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 online display advertising 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 online display advertising companies are there based in the United States?

RevenueBase identified 4,324 online display advertising companies 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?

The Trade Desk, headquartered in Ventura, tops this list with the largest team on record.

Which city has the most online display advertising companies?

New York leads with 313 headquartered companies, followed by Los Angeles (161) and Miami (120).

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 20,794 verified decision-maker contacts tracked across these 4,324 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.