Company lists · Data refreshed September 2026

Top 25 Customer expansion platforms based in the United States

Name: Customer expansion platforms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 1,724 companies tracked

RevenueBase identified 1,724 customer expansion platforms headquartered in the United States as of September 2026 and tracks 46,048 professional contacts across them, including 16,538 with verified work emails and 14,593 with mobile numbers. New York is the largest hub.

This list covers customer expansion platforms 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 3, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

1,724Companies

46,048Contacts tracked

16,538Verified emails

14,593Mobile numbers

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The 25 largest customer expansion platforms based in the United States

Ranked by team size

Top 25 of 1,724 customer expansion platforms based in the United States, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names customer expansion platforms: 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	KlaviyoIndirect evidence	Boston, MA, United States	1,001-5,000	2,859
	“Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: company website · checked Sep 3, 2026
2	DEXYPIndirect evidence	Dallas, TX, United States	1,001-5,000	2,831
	“2019 Thryv, Inc.” Source: company website · checked Sep 3, 2026
3	Zeta GlobalIndirect evidence	Nashville, TN, United States	1,001-5,000	2,570
	“At Zeta Global (NYSE: ZETA), we help enterprise brands and agencies Achieve the Impossible™ with superintelligent marketing.” Source: company website · checked Sep 3, 2026
4	Constant ContactIndirect evidence	Gainesville, FL, United States	1,001-5,000	1,636
	“We deliver for small businesses with powerful tools to simplify and amplify digital marketing.” Source: company website · checked Sep 3, 2026
5	Intuit MailchimpIndirect evidence	Oakland, CA, United States	1,001-5,000	1,557
	“The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: company website · checked Sep 3, 2026
6	6sensePartial evidence	New York, United States	1,001-5,000	1,426
	“6sense is on a mission to revolutionize the way B2B organizations create revenue by predicting customers most likely to buy and recommending the best course of action to engage…” Source: company website · checked Sep 3, 2026
7	ActivecampaignPartial evidence	Chicago, IL, United States	1,001-5,000	852
	“ActiveCampaign is the AI-first autonomous marketing platform built to transform how marketers, agencies, and entrepreneurs work.” Source: company website · checked Sep 3, 2026
8	MarigoldIndirect evidence	Nashville, TN, United States	201-500	818
	“Marigold is a global marketing technology company focused on delivering relationship marketing solutions for growing organizations.” Source: company website · checked Sep 3, 2026
9	VendastaPartial evidence	Boston, MA, United States	501-1,000	768
	“Vendasta is the leading AI software company for customer acquisition and engagement, helping businesses get more customers.” Source: company website · checked Sep 3, 2026
10	ApplovinIndirect evidence	Palo Alto, CA, United States	201-500	753
	“AppLovin helps businesses of any size reach over a billion people who play mobile games every day.” Source: company website · checked Sep 3, 2026
11	Movable INKPartial evidence	Chicago, IL, United States	501-1,000	667
	“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: company website · checked Sep 3, 2026
12	OptimoveIndirect evidence	New York, NY, United States	501-1,000	577
	“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 3, 2026
13	Adobe MarketoPartial evidence	Atlanta, GA, United States	1,001-5,000	570
	“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 3, 2026
14	AcousticIndirect evidence	Waltham, MA, United States	501-1,000	532
	“Acoustic, L.P.” Source: company website · checked Sep 3, 2026
15	Treasure AIPartial evidence	New York, NY, United States	501-1,000	503
	“Treasure AI is the Agentic Experience Platform built for modern marketing teams.” Source: company website · checked Sep 3, 2026
16	DotdigitalStrong evidence	New York, NY, United States	201-500	488
	“Dotdigital is a marketing personalization platform that helps you connect with your customers on the channels they know and love.” Source: company website · checked Sep 3, 2026
17	BranchIndirect evidence	Mountain View, CA, United States	201-500	456
	“Branch is on a mission: to power impactful experiences in the connected world.” Source: company website · checked Sep 3, 2026
18	customer.ioStrong evidence	Portland, OR, United States	201-500	445
	“Create personalized customer journeys that engage and convert with our versatile customer engagement platform.” Source: company website · checked Sep 3, 2026
19	InvocaPartial evidence	West Hollywood, CA, United States	201-500	384
	“Invoca is the revenue execution and platform leader that helps marketing, commerce, and contact center teams turn every conversation into revenue.” Source: company website · checked Sep 3, 2026
20	ResulticksPartial evidence	New York, NY, United States	201-500	362
	“Resulticks is a fully integrated, real-time audience engagement solution designed to help brands worldwide reach, acquire, and retain satised customers.” Source: company website · checked Sep 3, 2026
21	HightouchPartial evidence	San Francisco, CA, United States	201-500	354
	“Hightouch is an Agentic Marketing Platform powered by the industry-leading Composable CDP.” Source: company website · checked Sep 3, 2026
22	Validity INCIndirect evidence	Tampa, FL, United States	201-500	349
	“For over 25 years, thousands of the world’s leading brands have relied on Validity solutions to achieve end-to-end marketing success-using trustworthy data as a key advantage.” Source: company website · checked Sep 3, 2026
23	HoneybookPartial evidence	San Francisco, CA, United States	201-500	333
	“HoneyBook is the leading AI-powered business management platform for small business owners.” Source: company website · checked Sep 3, 2026
24	CallrailStrong evidence	Atlanta, GA, United States	201-500	330
	“CallRail is the lead engagement platform that makes it easy for businesses to attract more leads, convert more customers, and optimize their marketing.” Source: company website · checked Sep 3, 2026
25	Higher LogicIndirect evidence	Arlington, VA, United States	201-500	302
	“Higher Logic is revolutionizing engagement for associations and businesses.” Source: company website · checked Sep 3, 2026

Showing 25 of 1,724 customer expansion platforms based in the United States

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Customer expansion platforms based in the United States at a glance

As of Sep 3, 2026

1-10Median size (employees)

New YorkLargest hub · 105 HQs

14,593Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

889

11-50

553

51-200

195

201-500

501-1,000

1,001-5,000

5,001-10,000

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 customer expansion platforms, 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 “customer expansion platforms”. 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 customer expansion platforms, 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, 16,538 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 3, 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.

Customer expansion platforms by metro

Customer expansion platforms in New York105
Customer expansion platforms in San Francisco74
Customer expansion platforms in Austin42
Customer expansion platforms in Miami31
Customer expansion platforms in Los Angeles31
Customer expansion platforms in Sheridan31
Customer expansion platforms in Las Vegas29

Frequently asked

How many customer expansion platforms are there based in the United States?

RevenueBase identified 1,724 customer expansion platforms 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?

Klaviyo, headquartered in Boston, tops this list with the largest team on record.

Which city has the most customer expansion platforms?

New York leads with 105 headquartered companies, followed by San Francisco (74) and Austin (42).

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 16,538 verified decision-maker contacts tracked across these 1,724 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 3, 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.