Company lists · Data refreshed September 2026

Top 25 Contact center as a service providers worldwide

Name: Contact center as a service providers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 3,246 companies tracked

RevenueBase identified 3,246 contact center as a service providers worldwide as of September 2026 and tracks 465,458 professional contacts across them, including 55,471 with verified work emails and 29,777 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers contact center as a service providers worldwide, 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 1, 2026. Country and city lists for contact center as a service providers follow the table.

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 RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

3,246Companies

465,458Contacts tracked

55,471Verified emails

29,777Mobile numbers

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The 25 largest contact center as a service providers worldwide

Ranked by team size

Top 25 of 3,246 contact center as a service providers worldwide, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to contact center as a service providers: 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	Atento	Indirect evidence	Sao Paulo, BR	10001+	77,086 contacts →
	Indirect evidence “We are one of the world's largest global providers of customer relationship management and business transformation outsourcing (CRM/BTO) services and industry leaders in Latin…” Source: RevenueBase Database · checked Sep 1, 2026
2	Foundever	Indirect evidence	Miami, FL, US	10001+	30,697 contacts →
	Indirect evidence “Foundever® is the next-generation service leader reinventing customer experience (CX).” Source: RevenueBase Database · checked Sep 1, 2026
3	TTEC	Indirect evidence	Rockleigh, NJ, US	10001+	26,476 contacts →
	Indirect evidence “We’re TTEC (pronounced t.tec).” Source: RevenueBase Database · checked Sep 1, 2026
4	AEC	Indirect evidence	Sao Paulo, BR	10001+	20,081 contacts →
	Indirect evidence “A AeC é apontada consistentemente como a líder brasileira na entrega de soluções de experiência do cliente e gestão de processos terceirizados.” Source: RevenueBase Database · checked Sep 1, 2026
5	IQOR	Indirect evidence	Fort Lauderdale, FL, US	10001+	17,301 contacts →
	Indirect evidence “iQor is a trusted partner in customer experience solutions for global brands and a portfolio company of Mill Point Capital.” Source: RevenueBase Database · checked Sep 1, 2026
6	Startek	Indirect evidence	San Miguel De Tucuman, AR	10001+	15,081 contacts →
	Indirect evidence “A global customer experience (CX) management solutions provider, Startek® delivers best-in-class omnichannel CX, digital transformation and enterprise tech services for leading…” Source: RevenueBase Database · checked Sep 1, 2026
7	Cogent E Services	Indirect evidence	Noida, IndiaHQ checked Sep 1, 2026	10001+	7,313 contacts →
	Indirect evidence “We are an end-to-end Customer Experience (CX) solutions provider offering omni-channel solutions along various customer interaction touch-points from customer sales and support…” Source: RevenueBase Database · checked Sep 1, 2026
8	Ringcentral	Strong evidence	Sydney, AU	5,001-10,000	6,486 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 1, 2026
9	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 1, 2026	10001+	6,167 contacts →
	Indirect evidence “Bir Turkcell grup şirketi olarak yılında kurulduğumuzda amacımız hep eşsiz bir müşteri deneyimi yaşatmaktı.” Source: RevenueBase Database · checked Sep 1, 2026
10	Call Center Services International	Strong evidence	MX	1,001-5,000	4,548 contacts →
	Strong evidence “CCSI specializes in high‑performance, cost‑efficient contact center solutions supported by a world‑class bilingual workforce and state‑of‑the‑art infrastructure in Mexico.” Source: RevenueBase Database · checked Sep 1, 2026
11	Raya CX	Indirect evidence	Giza, EgyptHQ checked Sep 1, 2026	5,001-10,000	3,989 contacts →
	Indirect evidence “RAYA Customer Experience provides next-generation BPO and customer experience management on behalf of clients across various industries.” Source: RevenueBase Database · checked Sep 1, 2026
12	Verint	Strong evidence	Chicago, IL, US	5,001-10,000	3,832 contacts →
	Strong evidence “Verint helps you deliver AI outcomes now to solve your most pressing CX automation challenges in the contact center and beyond.” Source: RevenueBase Database · checked Sep 1, 2026
13	Sercom	Strong evidence	Taboao Da Serra, BR	5,001-10,000	3,788 contacts →
	Strong evidence “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Source: RevenueBase Database · checked Sep 1, 2026
14	GSS Global Sales Solutions	Indirect evidence	Roma, IT	10001+	3,729 contacts →
	Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 1, 2026
15	Vonage	Indirect evidence	Holmdel, NJ, US	1,001-5,000	3,512 contacts →
	Indirect evidence “We’re making communications more flexible, intelligent, and personal, to help enterprises the world over stay ahead.” Source: RevenueBase Database · checked Sep 1, 2026
16	TMKT	Strong evidence	Poa, BR	5,001-10,000	3,320 contacts →
	Strong evidence “A TMKT é uma empresa de Contact Center que foi fundada em 1991 e se tornou uma referência no mercado de Customer Experience (CX).” Source: RevenueBase Database · checked Sep 1, 2026
17	Quantrics Enterprises INC	Indirect evidence	Taytay, PhilippinesHQ checked Sep 1, 2026	5,001-10,000	3,132 contacts →
	Indirect evidence “In the Philippines, Quantrics by NQX is redefining customer experience by bringing together the expertise of a global leader and the passion of world-class Filipino talent.” Source: RevenueBase Database · checked Sep 1, 2026
18	Telvista	Partial evidence	Dallas, TX, US	1,001-5,000	3,125 contacts →
	Partial evidence “Email: info@Telvista.com Telvista is a premier provider of contact solutions that drive customer loyalty and create competitive advantage for our clients.” Source: RevenueBase Database · checked Sep 1, 2026
19	EPX Eperformax Contact Centers	Strong evidence	Pasay City, PhilippinesHQ checked Sep 1, 2026	5,001-10,000	3,061 contacts →
	Strong evidence “ePerformax is a high-performing contact center & BPO that provides world-class, omnichannel service and support to a select group of Fortune companies and their customers.” Source: RevenueBase Database · checked Sep 1, 2026
20	VGX Contact Center	Indirect evidence	Belo Horizonte, BR	1,001-5,000	2,938 contacts →
	Indirect evidence “A VGX, é uma empresa 100% brasileira, com 13 anos de atuação e mais de 5.100 colaboradores, consolidada como referência em soluções de Customer Experience,Cobrança, Atendimento…” Source: RevenueBase Database · checked Sep 1, 2026
21	Grupo Contax	Strong evidence	Sao Paulo, BR	10001+	2,857 contacts →
	Strong evidence “Líder em Contact Center na América Latina e um dos maiores do mundo em BPO, especializado em soluções para gestão do relacionamento com o consumidor, o Grupo Contax atua de…” Source: RevenueBase Database · checked Sep 1, 2026
22	Advanced Call Center Technologies, LLC	Partial evidence	Johnson City, TN, US	5,001-10,000	2,779 contacts →
	Partial evidence “Advanced Call Center Technologies, LLC (ACT) is a premier provider of domestic (USA), near shore and far shore outsourced call center services to the financial services, mortgage…” Source: RevenueBase Database · checked Sep 1, 2026
23	Five9	Indirect evidence	San Ramon, CA, US	1,001-5,000	2,578 contacts →
	Indirect evidence “Five9 provides a comprehensive suite of CX solutions, powered by Five9 Genius AI, to elevate customer experiences that deliver better business outcomes in the era of The New CX.” Source: RevenueBase Database · checked Sep 1, 2026
24	Inspiro	Indirect evidence	Makati City Manila, PhilippinesHQ checked Sep 1, 2026	10001+	2,482 contacts →
	Indirect evidence “A global CX outsourcing leader, Inspiro empowers smart, secure, seamless, scalable, and satisfying customer experience (CX) across a network of BPO and customer champions in 100…” Source: RevenueBase Database · checked Sep 1, 2026
25	8x8	Indirect evidence	Aylesbury, GB	1,001-5,000	2,427 contacts →
	Indirect evidence “8x8, Inc.(NASDAQ: EGHT) believes that CX limits were meant to be shattered.” Source: RevenueBase Database · checked Sep 1, 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: contact center as a service providers. 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 contact center as a service providers.
Partial evidence: Its own public description names part of contact center as a service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contact center as a service providers. 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 3,246 contact center as a service providers worldwide

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Contact center as a service providers worldwide at a glance

As of Sep 1, 2026

11.9%Verified-email coverage

6.4%Mobile-number coverage

143.4Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · Sao Paulo

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

646

11-50

1,088

51-200

795

201-500

282

501-1,000

166

1,001-5,000

179

5,001-10,000

10001+

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 contact center as a service providers, 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.
Coverage: 23 countries, largest first: the United States, India, Brazil, the United Kingdom, the Philippines, Canada, Mexico, Germany, Spain, France and 13 more. Country and city lists for contact center as a service providers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “contact center as a service providers”. 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 contact center as a service providers), 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 contact center as a service providers, and records with no verified work email.
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, 55,471 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 between September 1, 2026 and September 14, 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.

Contact center as a service providers by location

31 lists · largest first

Every Contact center as a service providers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 contact center as a service providers, 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 contact center as a service providers are there worldwide?

RevenueBase identified 3,246 contact center as a service providers worldwide 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?

Atento, headquartered in Sao Paulo, tops this list with the largest team on record.

Which country has the most contact center as a service providers?

The United States leads with 956 companies, followed by India (368) and Brazil (281). Every contact center as a service providers list by country and city is linked on this page.

Which city has the most contact center as a service providers?

Sao Paulo leads with 98 headquartered companies, followed by London (57) and Madrid (35).

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 55,471 verified decision-maker contacts tracked across these 3,246 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 1, 2026 and September 14, 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.