Company lists · Data refreshed September 2026

Top 25 Online marketplace advertising agencies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 1,099 companies tracked

RevenueBase identified 1,099 online marketplace advertising agencies headquartered in the United States as of September 2026 and tracks 18,885 professional contacts across them, including 7,106 with verified work emails. New York is the largest hub.

This list covers online marketplace advertising agencies 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 29, 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 29, 2026 86% judged on-target in blind review

1,099Companies

18,885Contacts tracked

7,106Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest online marketplace advertising agencies based in the United States

Ranked by team size

Top 25 of 1,099 online marketplace advertising agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to online marketplace advertising 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	The Trade Desk	Indirect evidence	Ventura, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,307 contacts →
	Indirect evidence “It's more than just clicks.” Source: RevenueBase Database · checked Sep 29, 2026
2	Quinstreet	Strong evidence	Foster City, CA, United StatesHQ checked Sep 29, 2026	501-1,000	1,035 contacts →
	Strong 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 29, 2026
3	Ebay For Business	Strong evidence	San Jose, CA, United StatesHQ checked Sep 29, 2026	10001+	744 contacts →
	Strong evidence “eBay is one of the world’s largest online marketplaces, connecting people with the things they need and love virtually anytime, anywhere.” Source: RevenueBase Database · checked Sep 29, 2026
4	Quartile	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	468 contacts →
	Indirect evidence “Quartile, the world's largest retail media optimization platform, is a trusted partner for multichannel e-commerce success.” Source: RevenueBase Database · checked Sep 29, 2026
5	Emprendedor	Indirect evidence	Coral Gables, FL, United StatesHQ checked Sep 29, 2026	n/a	394 contacts →
	Indirect evidence “E-commerce - Construye una Marca - Digital Marketing” Source: RevenueBase Database · checked Sep 29, 2026
6	Localedge	Strong evidence	Buffalo, NY, United StatesHQ checked Sep 29, 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 29, 2026
7	Admedia	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 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 29, 2026
8	Admarketplace	Strong evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	232 contacts →
	Strong evidence “adMarketplace is the largest global marketplace for Native Search advertising.” Source: RevenueBase Database · checked Sep 29, 2026
9	Podean	Partial evidence	New York, United StatesHQ checked Sep 29, 2026	201-500	207 contacts →
	Partial evidence “Podean is a global, award-winning marketplace marketing agency.” Source: RevenueBase Database · checked Sep 29, 2026
10	Elocal	Partial evidence	Conshohocken, PA, United StatesHQ checked Sep 29, 2026	51-200	204 contacts →
	Partial evidence “eLocal, part of HomeServe Plc, global leader in the home services industry, is a fast-growing and highly profitable national leader in pay-for-performance digital advertising.” Source: RevenueBase Database · checked Sep 29, 2026
11	Connexity, INC	Partial evidence	Santa Monica, CA, United StatesHQ checked Sep 29, 2026	201-500	204 contacts →
	Partial evidence “Connexity, a Taboola company is a performance-marketing technology company whose core purpose is to help online retailers find new customers and drive sales at a cost that meets…” Source: RevenueBase Database · checked Sep 29, 2026
12	Urtasker	Indirect evidence	Brentwood, NY, United StatesHQ checked Sep 29, 2026	51-200	204 contacts →
	Indirect evidence “At Urtasker, our vision is grounded in integrity, honesty, passion, genuine empathy, and professionalism.” Source: RevenueBase Database · checked Sep 29, 2026
13	XANDR	Strong evidence	New York, United StatesHQ checked Sep 29, 2026	1,001-5,000	203 contacts →
	Strong evidence “Xandr, a part of Microsoft Advertising, powers a global marketplace for premium advertising.” Source: RevenueBase Database · checked Sep 29, 2026
14	Townsquare Ignite	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	199 contacts →
	Partial evidence “Townsquare Ignite is a customer-centric, data-driven technology provider of cross-platform advertising solutions including programmatic, search, marketing and client services.” Source: RevenueBase Database · checked Sep 29, 2026
15	Target Media Partners	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	501-1,000	197 contacts →
	Partial evidence “Target Media Partners (TMP) is dedicated to helping auto dealerships and other SMBs grow their business through our mix of digital advertising solutions, and we are the only media…” Source: RevenueBase Database · checked Sep 29, 2026
16	Helium 10	Partial evidence	Irvine, CA, United StatesHQ checked Sep 29, 2026	51-200	178 contacts →
	Partial evidence “Helium 10 is an all-in-one e-commerce platform that helps brands launch, grow, and scale across major marketplaces.” Source: RevenueBase Database · checked Sep 29, 2026
17	Code3	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 29, 2026	201-500	151 contacts →
	Indirect evidence “Code3 (formerly SocialCode) is a performance marketing partner working at the intersection of media, creative, and commerce, to help brands succeed faster.” Source: RevenueBase Database · checked Sep 29, 2026
18	Datawrkz	Partial evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	201-500	142 contacts →
	Partial evidence “Your time is yours again with our powerful digital advertising solutions.” Source: RevenueBase Database · checked Sep 29, 2026
19	C1x INC	Indirect evidence	San Jose, United StatesHQ checked Sep 29, 2026	51-200	128 contacts →
	Indirect evidence “AI, Data & Revenue Technology for the Intelligent Enterprise C1X is a Silicon Valley-based AI, Data, and Revenue Technology company helping organizations transform data into…” Source: RevenueBase Database · checked Sep 29, 2026
20	Buyerlink	Strong evidence	Walnut Creek, CA, United StatesHQ checked Sep 29, 2026	51-200	115 contacts →
	Strong evidence “Buyerlink is a leading online auction marketplace for performance-based marketing.” Source: RevenueBase Database · checked Sep 29, 2026
21	Greensheet Media	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	113 contacts →
	Partial evidence “Our number one goal is to provide personalized service and affordable, effective advertising solutions to build your business.” Source: RevenueBase Database · checked Sep 29, 2026
22	BUY BOX Experts	Partial evidence	Lehi, UT, United StatesHQ checked Sep 29, 2026	51-200	111 contacts →
	Partial evidence “Buy Box Experts is a marketing agency for medium to large online sellers, as well as investors of businesses selling on Amazon.” Source: RevenueBase Database · checked Sep 29, 2026
23	Lyfe Marketing	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	51-200	107 contacts →
	Partial evidence “We're a social media marketing company in Atlanta who help small businesses increase revenue through strategic online strategies.” Source: RevenueBase Database · checked Sep 29, 2026
24	Ejam INC	Strong evidence	Newport Beach, CA, United StatesHQ checked Sep 29, 2026	11-50	98 contacts →
	Strong evidence “Ejam is a performance-based online advertising and marketing leader.” Source: RevenueBase Database · checked Sep 29, 2026
25	SOLEO	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 29, 2026	51-200	98 contacts →
	Indirect evidence “For over 20 years, our mission has remained the same: make useful connections for people everywhere, every day.” Source: RevenueBase Database · checked Sep 29, 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 marketplace advertising 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 online marketplace advertising agencies.
Partial evidence: Its own public description names part of online marketplace advertising agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name online marketplace advertising 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 1,099 online marketplace advertising agencies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,106 reachable decision-makers.

Free signup · no credit card

View the full list →

Online marketplace advertising agencies based in the United States at a glance

As of Sep 29, 2026

37.6%Verified-email coverage

17.2Average contacts per company

1-10Median size (employees)

7.7%Largest-city concentration · New York

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

608

11-50

345

51-200

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 1,099 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 marketplace advertising 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “online marketplace advertising 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 online marketplace advertising 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 online marketplace advertising agencies, 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, 7,106 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 29, 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 marketplace advertising agencies 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 marketplace advertising 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 online marketplace advertising agencies are there based in the United States?

RevenueBase identified 1,099 online marketplace advertising agencies 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 marketplace advertising agencies?

New York leads with 85 headquartered companies, followed by Los Angeles (43) and San Francisco (29).

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 7,106 verified decision-maker contacts tracked across these 1,099 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 29, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,099 online marketplace advertising agencies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Online marketplace advertising agencies by geography

Browse the directory

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.