Company lists · Data refreshed September 2026

Top 25 Marketing automation firms based in the United States

Name: Marketing automation firms 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 4,282 companies tracked

RevenueBase identified 4,282 marketing automation firms headquartered in the United States as of September 2026 and tracks 68,608 professional contacts across them, including 24,689 with verified work emails. New York is the largest hub.

This list covers marketing automation firms 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

4,282Companies

68,608Contacts tracked

24,689Verified emails

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The 25 largest marketing automation firms based in the United States

Ranked by team size

Top 25 of 4,282 marketing automation firms 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 marketing automation firms: 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	Hubspot	Indirect evidence	Cambridge, MA, United StatesHQ checked Sep 21, 2026	5,001-10,000	11,077 contacts →
	Indirect evidence “HubSpot is a leading agentic customer platform that provides software and support to help businesses grow better.” Source: RevenueBase Database · checked Sep 21, 2026
2	Klaviyo	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,789 contacts →
	Indirect evidence “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: RevenueBase Database · checked Sep 21, 2026
3	Zeta Global	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
4	Localiq	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,534 contacts →
	Partial evidence “Grow your business with digital marketing powered by AI and local expertise.” Source: RevenueBase Database · checked Sep 21, 2026
5	Intuit Mailchimp	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,483 contacts →
	Partial evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 21, 2026
6	Centro	Strong evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	1,178 contacts →
	Strong evidence “Basis Technologies is a global provider of workflow automation, intelligence and programmatic trading software for the marketing enterprise.” Source: RevenueBase Database · checked Sep 21, 2026
7	Demandscience	Indirect evidence	Boston, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,087 contacts →
	Indirect evidence “With proprietary data and omni-channel activation like events, content, programmatic and chat, we cut through the noise to reach entire buyer groups, driving engagement and impact…” Source: RevenueBase Database · checked Sep 21, 2026
8	Activecampaign	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	863 contacts →
	Partial evidence “ActiveCampaign is the AI-first autonomous marketing platform built to transform how marketers, agencies, and entrepreneurs work.” Source: RevenueBase Database · checked Sep 21, 2026
9	Marigold	Partial evidence	Nashville, TN, United StatesHQ checked Sep 21, 2026	201-500	820 contacts →
	Partial evidence “Marigold is a global marketing technology company focused on delivering relationship marketing solutions for growing organizations.” Source: RevenueBase Database · checked Sep 21, 2026
10	Manlitics B2B Ites	Partial evidence	New York, United StatesHQ checked Sep 21, 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 21, 2026
11	simpli.fi	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 21, 2026	501-1,000	680 contacts →
	Indirect evidence “Simpli.fi is a real-world media platform that connects digital intent with physical movement, helping brands reach audiences in the right place, at the right moment, to drive…” Source: RevenueBase Database · checked Sep 21, 2026
12	Movable INK	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	672 contacts →
	Indirect 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 21, 2026
13	Optimove	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	588 contacts →
	Partial evidence “Optimove, the creator of Positionless Marketing, frees marketing teams from the limitations of fixed roles, giving every marketer the power to execute any marketing task instantly…” Source: RevenueBase Database · checked Sep 21, 2026
14	Adobe Marketo	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	572 contacts →
	Indirect evidence “Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: RevenueBase Database · checked Sep 21, 2026
15	Marketone International	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 21, 2026	201-500	431 contacts →
	Indirect evidence “MarketOne is a global demand generation agency.” Source: RevenueBase Database · checked Sep 21, 2026
16	HCL Unica	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 21, 2026	10001+	381 contacts →
	Partial evidence “Collaborate, innovate and drive the business forward with HCLSoftware's Digital Transformation marketing software solution.” Source: RevenueBase Database · checked Sep 21, 2026
17	GSM	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	51-200	361 contacts →
	Partial evidence “GSM is a full service Fixed-Ops marketing company specializing in the automotive industry.” Source: RevenueBase Database · checked Sep 21, 2026
18	Hightouch	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	201-500	358 contacts →
	Partial evidence “Hightouch is an Agentic Marketing Platform powered by the industry-leading Composable CDP.” Source: RevenueBase Database · checked Sep 21, 2026
19	Validity INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	345 contacts →
	Indirect evidence “Validity created the AI platform behind the world's most successful email programs.” Source: RevenueBase Database · checked Sep 21, 2026
20	Soci, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	501-1,000	338 contacts →
	Indirect evidence “SOCi is the leading CoMarketing Cloud for multi-location enterprises.” Source: RevenueBase Database · checked Sep 21, 2026
21	Callrail	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	201-500	332 contacts →
	Partial evidence “CallRail is the lead engagement platform that makes it easy for businesses to attract more leads, convert more customers, and optimize their marketing.” Source: RevenueBase Database · checked Sep 21, 2026
22	Nextroll	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	201-500	320 contacts →
	Partial evidence “NextRoll is a leading marketing technology company that empowers businesses to drive sustainable growth while building trusted connections with their audiences.” Source: RevenueBase Database · checked Sep 21, 2026
23	C-4 Analytics	Partial evidence	Wakefield, MA, United StatesHQ checked Sep 21, 2026	201-500	318 contacts →
	Partial evidence “C-4 Analytics is a cutting-edge automotive digital marketing solution dedicated to helping dealerships thrive in a digital-first world.” Source: RevenueBase Database · checked Sep 21, 2026
24	marketing.com	Partial evidence	Eureka, MO, United StatesHQ checked Sep 21, 2026	1,001-5,000	309 contacts →
	Partial evidence “From click to print and everything in between, we’re not changing marketing, just how it’s done.” Source: RevenueBase Database · checked Sep 21, 2026
25	Claritas	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 21, 2026	201-500	299 contacts →
	Partial evidence “Claritas: Empowering Data-Driven Marketing With nearly 50 years of understanding the American consumer, Claritas offers a comprehensive marketing optimization platform.” 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: marketing automation firms. 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 marketing automation firms.
Partial evidence: Its own public description names part of marketing automation firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marketing automation firms. 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 4,282 marketing automation firms based in the United States

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Marketing automation firms based in the United States at a glance

As of Sep 21, 2026

36.0%Verified-email coverage

16.0Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

2,855

11-50

1,067

51-200

251

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 4,282 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 marketing automation firms, 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 “marketing automation firms”. 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 marketing automation firms), 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 marketing automation firms, 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, 24,689 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.

Marketing automation firms 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 marketing automation firms, 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 marketing automation firms are there based in the United States?

RevenueBase identified 4,282 marketing automation firms 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?

Hubspot, headquartered in Cambridge, tops this list with the largest team on record.

Which city has the most marketing automation firms?

New York leads with 204 headquartered companies, followed by San Francisco (124) and Miami (117).

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 24,689 verified decision-maker contacts tracked across these 4,282 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.