Company lists · Data refreshed September 2026

Top 25 Engagement automation software companies based in the United States

Name: Engagement automation software 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 28, 2026 1,529 companies tracked

RevenueBase identified 1,529 engagement automation software companies headquartered in the United States as of September 2026 and tracks 60,030 professional contacts across them, including 27,311 with verified work emails. San Francisco is the largest hub.

This list covers engagement automation software 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 28, 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 28, 2026 86% judged on-target in blind review

1,529Companies

60,030Contacts tracked

27,311Verified emails

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The 25 largest engagement automation software companies based in the United States

Ranked by team size

Top 25 of 1,529 engagement automation software companies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to engagement automation software 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	Hubspot	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 28, 2026	5,001-10,000	11,077 contacts →
	Partial evidence “HubSpot is a leading agentic customer platform that provides software and support to help businesses grow better.” Source: RevenueBase Database · checked Sep 28, 2026
2	NICE	Indirect evidence	Hoboken, NJ, United StatesHQ checked Sep 28, 2026	5,001-10,000	10,721 contacts →
	Indirect evidence “NiCE is transforming the world with AI that puts people first.” Source: RevenueBase Database · checked Sep 28, 2026
3	Twilio	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	6,047 contacts →
	Partial evidence “Today's leading companies trust Twilio's Customer Engagement Platform (CEP) to build direct, personalized relationships with their customers everywhere in the world.” Source: RevenueBase Database · checked Sep 28, 2026
4	Klaviyo	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,789 contacts →
	Indirect evidence “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: RevenueBase Database · checked Sep 28, 2026
5	BRAZE	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,142 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
6	Intuit Mailchimp	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,483 contacts →
	Indirect evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 28, 2026
7	Centro	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 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 28, 2026
8	Moengage	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	908 contacts →
	Partial evidence “MoEngage is an agentic customer engagement platform for the customer-obsessed marketers and product owners.” Source: RevenueBase Database · checked Sep 28, 2026
9	Activecampaign	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	863 contacts →
	Indirect evidence “ActiveCampaign is the AI-first autonomous marketing platform built to transform how marketers, agencies, and entrepreneurs work.” Source: RevenueBase Database · checked Sep 28, 2026
10	Marigold	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	201-500	820 contacts →
	Indirect evidence “Marigold is a global marketing technology company focused on delivering relationship marketing solutions for growing organizations.” Source: RevenueBase Database · checked Sep 28, 2026
11	Iterable	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	771 contacts →
	Partial evidence “Iterable is the AI customer engagement platform built for enterprise scale, loved by teams, and trusted by global brands like Priceline, Fabletics, Blockchain, and Box.” Source: RevenueBase Database · checked Sep 28, 2026
12	Khoros	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	501-1,000	763 contacts →
	Partial evidence “Khoros' award-winning enterprise software makes it easier for complex brands to engage with customers at scale across digital, social, and brand-owned channels.” Source: RevenueBase Database · checked Sep 28, 2026
13	Applovin	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 2026	201-500	733 contacts →
	Indirect evidence “AppLovin helps businesses of any size reach over a billion people who play mobile games every day.” Source: RevenueBase Database · checked Sep 28, 2026
14	On24	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	622 contacts →
	Indirect evidence “ON24, a Cvent company, is on a mission to help businesses bring their go-to-market strategy into the AI era and drive cost-effective revenue growth.” Source: RevenueBase Database · checked Sep 28, 2026
15	Adobe Marketo	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	572 contacts →
	Partial 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 28, 2026
16	Acoustic	Indirect evidence	Conway, AR, United StatesHQ checked Sep 28, 2026	501-1,000	539 contacts →
	Indirect evidence “Acoustic, L.P.” Source: RevenueBase Database · checked Sep 28, 2026
17	Treasure AI	Indirect evidence	Mountain View, CA, United StatesHQ checked Sep 28, 2026	501-1,000	511 contacts →
	Indirect evidence “Treasure AI is the Agentic Experience Platform built for modern marketing teams.” Source: RevenueBase Database · checked Sep 28, 2026
18	customer.io	Partial evidence	Portland, OR, United StatesHQ checked Sep 28, 2026	201-500	446 contacts →
	Partial evidence “Create personalized customer journeys that engage and convert with our versatile customer engagement platform.” Source: RevenueBase Database · checked Sep 28, 2026
19	Resulticks	Partial evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	201-500	375 contacts →
	Partial evidence “Resulticks is a fully integrated, real-time audience engagement solution designed to help brands worldwide reach, acquire, and retain satised customers.” Source: RevenueBase Database · checked Sep 28, 2026
20	Invoca	Indirect evidence	West Hollywood, CA, United StatesHQ checked Sep 28, 2026	201-500	368 contacts →
	Indirect evidence “Invoca is the revenue execution and platform leader that helps marketing, commerce, and contact center teams turn every conversation into revenue.” Source: RevenueBase Database · checked Sep 28, 2026
21	AUGEO	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 28, 2026	501-1,000	359 contacts →
	Indirect evidence “Augeo is a loyalty platform with agentic AI that reads every signal and acts in real time, before the moment passes.” Source: RevenueBase Database · checked Sep 28, 2026
22	Validity INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
23	Callrail	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 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 28, 2026
24	Higher Logic	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	201-500	306 contacts →
	Partial evidence “Higher Logic is revolutionizing engagement for associations and businesses.” Source: RevenueBase Database · checked Sep 28, 2026
25	Listrak	Partial evidence	Lititz, PA, United StatesHQ checked Sep 28, 2026	201-500	295 contacts →
	Partial evidence “Listrak is the person-first marketing automation platform that seamlessly integrates data, identity, and cross-channel messaging to power hyper-personalized customer experiences.” 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: engagement automation software 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 engagement automation software companies.
Partial evidence: Its own public description names part of engagement automation software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engagement automation software 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 1,529 engagement automation software companies based in the United States

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Engagement automation software companies based in the United States at a glance

As of Sep 28, 2026

45.5%Verified-email coverage

39.3Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · San Francisco

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

955

11-50

410

51-200

104

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 1,529 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 engagement automation software 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 “engagement automation software 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 engagement automation software 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 engagement automation software 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, 27,311 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.

Engagement automation software 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 engagement automation software 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 engagement automation software companies are there based in the United States?

RevenueBase identified 1,529 engagement automation software 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?

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

Which city has the most engagement automation software companies?

San Francisco leads with 96 headquartered companies, followed by New York (83) and Los Angeles (49).

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 27,311 verified decision-maker contacts tracked across these 1,529 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.