Company lists · Data refreshed September 2026

Top 25 Marketing automation software developers based in the United States

Name: Marketing automation software developers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 1,151 companies tracked

RevenueBase identified 1,151 marketing automation software developers headquartered in the United States as of September 2026 and tracks 37,191 professional contacts across them, including 16,172 with verified work emails and 10,899 with mobile numbers. New York is the largest hub.

This list covers marketing automation software developers 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

1,151Companies

37,191Contacts tracked

16,172Verified emails

10,899Mobile numbers

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The 25 largest marketing automation software developers based in the United States

Ranked by team size

Top 25 of 1,151 marketing automation software developers based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names marketing automation software developers: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	HubspotPartial evidence	Cambridge, MA, United StatesHQ checked Sep 5, 2026	5,001-10,000	11,077
	“HubSpot is a leading agentic customer platform that provides software and support to help businesses grow better.” Source: company website · checked Sep 5, 2026
2	KlaviyoIndirect evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,789
	“Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: company website · checked Sep 5, 2026
3	BRAZEIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,142
	“Braze is the leading customer engagement platform that empowers brands to Be Absolutely Engaging.™ Braze allows any marketer to collect and take action on any amount of data from…” Source: company website · checked Sep 5, 2026
4	Intuit MailchimpPartial evidence	Atlanta, GA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,483
	“The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: company website · checked Sep 5, 2026
5	CentroStrong evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	501-1,000	1,178
	“Basis Technologies is a global provider of workflow automation, intelligence and programmatic trading software for the marketing enterprise.” Source: company website · checked Sep 5, 2026
6	MoengageIndirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	908
	“MoEngage is an agentic customer engagement platform for the customer-obsessed marketers and product owners.” Source: company website · checked Sep 5, 2026
7	ActivecampaignPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1,001-5,000	863
	“ActiveCampaign is the AI-first autonomous marketing platform built to transform how marketers, agencies, and entrepreneurs work.” Source: company website · checked Sep 5, 2026
8	MarigoldPartial evidence	Nashville, TN, United StatesHQ checked Sep 5, 2026	201-500	820
	“Marigold is a global marketing technology company focused on delivering relationship marketing solutions for growing organizations.” Source: company website · checked Sep 5, 2026
9	simpli.fiIndirect evidence	Fort Worth, TX, United StatesHQ checked Sep 5, 2026	501-1,000	680
	“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: company website · checked Sep 5, 2026
10	OptimovePartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	588
	“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: company website · checked Sep 5, 2026
11	Adobe MarketoIndirect evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	572
	“Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: company website · checked Sep 5, 2026
12	HCL UnicaStrong evidence	Sunnyvale, CA, United StatesHQ checked Sep 5, 2026	10001+	381
	“Collaborate, innovate and drive the business forward with HCLSoftware's Digital Transformation marketing software solution.” Source: company website · checked Sep 5, 2026
13	HightouchPartial evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	201-500	358
	“Hightouch is an Agentic Marketing Platform powered by the industry-leading Composable CDP.” Source: company website · checked Sep 5, 2026
14	ListrakStrong evidence	Lititz, PA, United StatesHQ checked Sep 5, 2026	201-500	295
	“Listrak is the person-first marketing automation platform that seamlessly integrates data, identity, and cross-channel messaging to power hyper-personalized customer experiences.” Source: company website · checked Sep 5, 2026
15	Warrior PlusStrong evidence	Henderson, NV, United StatesHQ checked Sep 5, 2026	n/a	260
	“Best-in-class sales & marketing automation platform and marketplace for digital business owners and online marketers” Source: company website · checked Sep 5, 2026
16	WEB SpidersStrong evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	201-500	250
	“Web Spiders (WS) is an enterprise software company that develops products for marketing and HR.” Source: company website · checked Sep 5, 2026
17	PositionIndirect evidence	Santa Clara, CA, United StatesHQ checked Sep 5, 2026	51-200	225
	“Position² is a fast-growing Demand Generation company, venture backed by Accel Partners.” Source: company website · checked Sep 5, 2026
18	Act-On SoftwareStrong evidence	Portland, OR, United StatesHQ checked Sep 5, 2026	201-500	210
	“Act-On Software provides the innovative marketing automation platform for marketers who think big and act boldly.” Source: company website · checked Sep 5, 2026
19	TangencePartial evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	201-500	205
	“Tangence accelerates marketing execution for companies more efficiently than in-house teams or other agencies.” Source: company website · checked Sep 5, 2026
20	KEAPIndirect evidence	Chandler, AZ, United StatesHQ checked Sep 5, 2026	201-500	192
	“With Keap, you'll easily capture, organize, track, and nurture all of your leads to increase sales and revenue.” Source: company website · checked Sep 5, 2026
21	OutboundenginePartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	201-500	181
	“We believe every business deserves great marketing.” Source: company website · checked Sep 5, 2026
22	SendpulsePartial evidence	New York, United StatesHQ checked Sep 5, 2026	51-200	180
	“SendPulse is an AI-driven marketing platform that helps scaling businesses automate email and chatbot conversations.” Source: company website · checked Sep 5, 2026
23	StiristaIndirect evidence	San Antonio, TX, United StatesHQ checked Sep 5, 2026	51-200	163
	“Stirista is the only company that combines data, email, and digital execution to help clients acquire and retain customers by creating a data-driven, repeatable, and scalable…” Source: company website · checked Sep 5, 2026
24	RightwaveStrong evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	51-200	159
	“RightWave provides Marketing Automation Services for B2B companies.” Source: company website · checked Sep 5, 2026
25	IcontactIndirect evidence	Morrisville, NC, United StatesHQ checked Sep 5, 2026	51-200	137
	“We believe powerful connections propel business growth.” Source: company website · checked Sep 5, 2026

Showing 25 of 1,151 marketing automation software developers based in the United States

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Marketing automation software developers based in the United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 52 HQs

10,899Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

698

11-50

310

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

15,175

31–60

850

61–90

90–180

180+

116

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 software developers, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 software developers”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among marketing automation software developers, 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 an evidence 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, 16,172 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 5, 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 software developers by metro

Frequently asked

How many marketing automation software developers are there based in the United States?

RevenueBase identified 1,151 marketing automation software developers 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 software developers?

New York leads with 52 headquartered companies, followed by San Francisco (48) and Los Angeles (31).

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 16,172 verified decision-maker contacts tracked across these 1,151 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 5, 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 SmartSearch, 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.