Company lists · Data refreshed September 2026

Top 25 Customer engagement companies based in the United States

Name: Customer engagement 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 21, 2026 1,682 companies tracked

RevenueBase identified 1,682 customer engagement companies headquartered in the United States as of September 2026 and tracks 142,768 professional contacts across them, including 42,951 with verified work emails. New York is the largest hub.

This list covers customer engagement 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 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

1,682Companies

142,768Contacts tracked

42,951Verified emails

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The 25 largest customer engagement companies based in the United States

Ranked by team size

Top 25 of 1,682 customer engagement companies 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 customer engagement 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	IBEX	Strong evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	10001+	15,457 contacts →
	Strong evidence “ibex delivers innovative business process outsourcing (BPO), smart digital marketing, online acquisition technology, and end-to-end customer engagement solutions to help companies…” Source: RevenueBase Database · checked Sep 21, 2026
2	Hubspot	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 21, 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 21, 2026
3	24 7.ai	Strong evidence	Campbell, CA, United StatesHQ checked Sep 21, 2026	10001+	8,461 contacts →
	Strong evidence “24]7.ai™ customer engagement solutions use conversational artificial intelligence to understand customer intent, enabling companies to create personalized, predictive, and…” Source: RevenueBase Database · checked Sep 21, 2026
4	Ringcentral	Strong evidence	Belmont, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	6,431 contacts →
	Strong evidence “RingCentral, Inc.(NYSE: RNG) is a global leader in AI–powered customer engagement, delivering an integrated platform for business phone, SMS, contact center, workforce engagement…” Source: RevenueBase Database · checked Sep 21, 2026
5	Twilio	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	6,047 contacts →
	Strong 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 21, 2026
6	CSG	Strong evidence	Englewood, CO, United StatesHQ checked Sep 21, 2026	5,001-10,000	5,874 contacts →
	Strong evidence “CSG is a leader in innovative customer engagement, revenue management and payments solutions that make ordinary customer experiences extraordinary.” Source: RevenueBase Database · checked Sep 21, 2026
7	Qualfon	Partial evidence	Highland Park, MI, United StatesHQ checked Sep 21, 2026	10001+	5,840 contacts →
	Partial evidence “Qualfon provides 360 degrees of customer experience support for your business with mission-driven processes that keep each person at the heart of every interaction.” Source: RevenueBase Database · checked Sep 21, 2026
8	Fusion CX	Partial evidence	Norcross, GA, United StatesHQ checked Sep 21, 2026	10001+	4,785 contacts →
	Partial evidence “At Fusion CX, we revolutionize customer experience by blending innovative technology and human connection.” Source: RevenueBase Database · checked Sep 21, 2026
9	Harte Hanks	Partial evidence	Chelmsford, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	3,901 contacts →
	Partial evidence “We are The Customer Company®, a global leader in Customer Experience (CX), Omnichannel Marketing, Data Services, Customer Care, Fulfillment, and Logistics.” Source: RevenueBase Database · checked Sep 21, 2026
10	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
11	THRYV	Partial evidence	Dallas, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,412 contacts →
	Partial evidence “Thryv is an AI-powered platform built to help small businesses get found, win customers, and drive repeat sales.” Source: RevenueBase Database · checked Sep 21, 2026
12	Marketing Werks	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	2,182 contacts →
	Partial evidence “Marketing Werks has become Product Connections, a fully integrated engagement agency specializing in omnichannel solutions that build relationships between brands and consumers.” Source: RevenueBase Database · checked Sep 21, 2026
13	BRAZE	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,142 contacts →
	Strong 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 21, 2026
14	Medallia	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,006 contacts →
	Indirect evidence “Medallia is the enterprise experience platform that turns every signal into decisive action.” Source: RevenueBase Database · checked Sep 21, 2026
15	BI Worldwide	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,905 contacts →
	Partial evidence “BI WORLDWIDE is a global engagement agency that uses the principles of behavioral economics to produce measurable business results by designing and delivering solutions that…” Source: RevenueBase Database · checked Sep 21, 2026
16	Op360 Officepartners360	Partial evidence	Ridgefield, CT, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,777 contacts →
	Partial evidence “OP360, part of iQor CXBPO™, is a trusted partner in intelligent customer experience solutions for global brands.” Source: RevenueBase Database · checked Sep 21, 2026
17	Support Services Group	Strong evidence	Waco, TX, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,710 contacts →
	Strong evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 21, 2026
18	Nextiva	Partial evidence	Scottsdale, AZ, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,638 contacts →
	Partial evidence “Build amazing customer experiences with Nextiva’s AI-powered platform.” Source: RevenueBase Database · checked Sep 21, 2026
19	Dialpad	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,473 contacts →
	Indirect evidence “Dialpad is the leading AI-powered communications intelligence platform creating human-first, AI-enhanced solutions that will drive the next wave of how businesses communicate with…” Source: RevenueBase Database · checked Sep 21, 2026
20	Attentive	Partial evidence	New York, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,287 contacts →
	Partial evidence “Attentive® knows personalized customer experiences require both powerful technology and the right people behind it.” Source: RevenueBase Database · checked Sep 21, 2026
21	Dialog Direct	Strong evidence	Highland Park, MI, United StatesHQ checked Sep 21, 2026	10001+	1,138 contacts →
	Strong evidence “Dialog Direct helps brands manage and personalize their multichannel, multi-touch customer journeys using data-driven marketing and customer engagement solutions.” Source: RevenueBase Database · checked Sep 21, 2026
22	Open Access BPO	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,021 contacts →
	Indirect evidence “Open Access is a leading outsourcing solutions provider with a history of delivering high-quality services to global businesses across industries.” Source: RevenueBase Database · checked Sep 21, 2026
23	Clearlink	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 21, 2026	501-1,000	988 contacts →
	Indirect evidence “Clearlink is an award-winning digital marketing, sales conversion, and technology company headquartered in Salt Lake City.” Source: RevenueBase Database · checked Sep 21, 2026
24	Moengage	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	501-1,000	908 contacts →
	Strong evidence “MoEngage is an agentic customer engagement platform for the customer-obsessed marketers and product owners.” Source: RevenueBase Database · checked Sep 21, 2026
25	ITA Group, INC	Indirect evidence	West Des Moines, IA, United StatesHQ checked Sep 21, 2026	501-1,000	868 contacts →
	Indirect evidence “ITA Group helps leading brands around the world take action with confidence, resulting in increased sales, purchases, retention, referrals and alignment.” 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: customer engagement 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 customer engagement companies.
Partial evidence: Its own public description names part of customer engagement companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer engagement 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 1,682 customer engagement companies based in the United States

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Customer engagement companies based in the United States at a glance

As of Sep 21, 2026

30.1%Verified-email coverage

84.9Average contacts per company

11-50Median size (employees)

6.3%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

716

11-50

610

51-200

204

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 1,682 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 customer engagement 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 “customer engagement 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 customer engagement 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 customer engagement 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, 42,951 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.

Customer engagement 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 customer engagement 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 customer engagement companies are there based in the United States?

RevenueBase identified 1,682 customer engagement 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?

IBEX, headquartered in Washington, tops this list with the largest team on record.

Which city has the most customer engagement companies?

New York leads with 106 headquartered companies, followed by San Francisco (92) and Atlanta (37).

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 42,951 verified decision-maker contacts tracked across these 1,682 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.