Company lists · Data refreshed September 2026

Top 25 Customer service outsourcing firms worldwide

Name: Customer service outsourcing firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 17,476 companies tracked

RevenueBase identified 17,476 customer service outsourcing firms worldwide as of September 2026 and tracks 1,067,221 professional contacts across them, including 95,976 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers customer service outsourcing firms 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 28, 2026. Country and city lists for customer service outsourcing firms 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

17,476Companies

1,067,221Contacts tracked

95,976Verified emails

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The 25 largest customer service outsourcing firms worldwide

Ranked by team size

Top 25 of 17,476 customer service outsourcing firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to customer service outsourcing firms: 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	Strong evidence	Madrid, MexicoHQ checked Sep 28, 2026	10001+	77,129 contacts →
	Strong 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 28, 2026
2	Alorica	Partial evidence	Irvine, CA, United StatesHQ checked Sep 28, 2026	10001+	47,558 contacts →
	Partial evidence “We’re passionate about creating customers for life by designing experiences that elevate your brand.” Source: RevenueBase Database · checked Sep 28, 2026
3	TTEC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	10001+	26,420 contacts →
	Indirect evidence “We’re TTEC (pronounced t.tec).” Source: RevenueBase Database · checked Sep 28, 2026
4	Konecta	Strong evidence	Madrid, SpainHQ checked Sep 28, 2026	10001+	23,763 contacts →
	Strong evidence “Konecta is a leading innovative global service provider in customer management business process outsourcing, with passionate employees working in 40 languages across 4 continents…” Source: RevenueBase Database · checked Sep 28, 2026
5	Capita	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	20,824 contacts →
	Indirect evidence “Capita is an outsourcer, helping clients across the public and private sectors run complex business processes more efficiently, creating better consumer experiences.” Source: RevenueBase Database · checked Sep 28, 2026
6	AEC	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 28, 2026	10001+	20,095 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 28, 2026
7	IBEX	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
8	Ienergizer	Strong evidence	Noida, IndiaHQ checked Sep 28, 2026	10001+	14,745 contacts →
	Strong evidence “iEnergizer is a leading Business Process Outsourcing provider (“BPO”) of customer management solutions dedicated to delivering performance while actively supporting and advocating…” Source: RevenueBase Database · checked Sep 28, 2026
9	VXI Global Solutions	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	10001+	14,238 contacts →
	Partial evidence “About VXI Global Solutions VXI Global Solutions is a BPO leader in customer service, customer experience, and digital solutions.” Source: RevenueBase Database · checked Sep 28, 2026
10	Intelcia	Partial evidence	Casablanca, MoroccoHQ checked Sep 28, 2026	10001+	13,214 contacts →
	Partial evidence “Intelcia is a global player in outsourcing, which has supported its clients for 20 years combining talents, technologies, and processes to offer a tailor-made service and skills…” Source: RevenueBase Database · checked Sep 28, 2026
11	Transcom	Partial evidence	Stockholm, SwedenHQ checked Sep 28, 2026	10001+	12,955 contacts →
	Partial evidence “Transcom provides digitally enhanced customer experience (CX) services to some of the world's most ambitious brands.” Source: RevenueBase Database · checked Sep 28, 2026
12	Comdata Group	Indirect evidence	Corsico, ItalyHQ checked Sep 28, 2026	10001+	9,614 contacts →
	Indirect evidence “We're KONECTA now!” Source: RevenueBase Database · checked Sep 28, 2026
13	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 28, 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 28, 2026
14	Everise	Partial evidence	Plantation, FL, United StatesHQ checked Sep 28, 2026	10001+	5,863 contacts →
	Partial evidence “Everise delivers happiness to millions of customers around the world.” Source: RevenueBase Database · checked Sep 28, 2026
15	Afni, INC	Indirect evidence	Bloomington, IL, United StatesHQ checked Sep 28, 2026	10001+	5,553 contacts →
	Indirect evidence “When people reach for their phones, use laptops, or grab their tablets, Afni's contact center teams are there to provide prompt and friendly help.” Source: RevenueBase Database · checked Sep 28, 2026
16	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 28, 2026	10001+	4,998 contacts →
	Indirect evidence “Maximizamos el valor de cada contacto de las empresas con sus clientes, gestionando los procesos de relacionamiento a través de canales tefónicos, virtuales y presenciales.” Source: RevenueBase Database · checked Sep 28, 2026
17	Call Center Services International	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,561 contacts →
	Indirect 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 28, 2026
18	Liderança Serviços	Indirect evidence	São José, BrazilHQ checked Sep 28, 2026	10001+	4,504 contacts →
	Indirect evidence “Atuamos nos principais setores de terceirização, e somos pioneiros na implantação de contratos à distância.” Source: RevenueBase Database · checked Sep 28, 2026
19	Startek India	Partial evidence	Mumbai, IndiaHQ checked Sep 28, 2026	10001+	4,389 contacts →
	Partial evidence “Startek is a leading global provider of technology-enabled business process outsourcing solutions.” Source: RevenueBase Database · checked Sep 28, 2026
20	Apex America	Partial evidence	Córdoba, ArgentinaHQ checked Sep 28, 2026	10001+	4,377 contacts →
	Partial evidence “At Apex America, we are a Next Generation BPO and a global strategic partner specialized in elevating customer service standards.” Source: RevenueBase Database · checked Sep 28, 2026
21	Mindbridge	Indirect evidence	Lahore, PakistanHQ checked Sep 28, 2026	5,001-10,000	4,359 contacts →
	Indirect evidence “Founded in 2004, Mindbridge (Private) Limited is Pakistan’s largest BPO company, operating with a capacity.” Source: RevenueBase Database · checked Sep 28, 2026
22	Continuum Global Solutions	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	4,342 contacts →
	Indirect evidence “With a fresh name and decades of contact center expertise, we’re dedicated to collaborative partnerships, understanding your unique needs, and tailoring solutions for an enhanced…” Source: RevenueBase Database · checked Sep 28, 2026
23	Paschoalotto	Partial evidence	Bauru, BrazilHQ checked Sep 28, 2026	10001+	4,193 contacts →
	Partial evidence “Somos um ecossistema de soluções em outsourcing, especialistas em cobrança e atendimento.” Source: RevenueBase Database · checked Sep 28, 2026
24	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 28, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 28, 2026
25	Callink	Indirect evidence	Uberlândia, BrazilHQ checked Sep 28, 2026	5,001-10,000	4,126 contacts →
	Indirect evidence “Mais que call center: soluções que transformam o seu negócio e a jornada dos clientes!” 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: customer service outsourcing firms. 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 service outsourcing firms.
Partial evidence: Its own public description names part of customer service outsourcing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer service outsourcing firms. 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 17,476 customer service outsourcing firms worldwide

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Customer service outsourcing firms worldwide at a glance

As of Sep 28, 2026

9.0%Verified-email coverage

61.1Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · Lahore

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

4,069

11-50

5,914

51-200

4,116

201-500

1,645

501-1,000

714

1,001-5,000

703

5,001-10,000

145

10001+

129

Email recency is reported on each country list linked below.

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 service outsourcing firms, 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: Every country. Country and city lists for customer service outsourcing firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “customer service outsourcing firms”. 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 service outsourcing firms), 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 service outsourcing firms, 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, 95,976 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.

Customer service outsourcing firms by location

104 lists · largest first

Every Customer service outsourcing firms 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 customer service outsourcing firms, 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 service outsourcing firms are there worldwide?

RevenueBase identified 17,476 customer service outsourcing firms 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 Madrid, tops this list with the largest team on record.

Which country has the most customer service outsourcing firms?

The United States leads with 2,529 companies, followed by India (2,222) and Pakistan (990). Every customer service outsourcing firms list by country and city is linked on this page.

Which city has the most customer service outsourcing firms?

Lahore leads with 338 headquartered companies, followed by Sao Paulo (197) and London (195).

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 95,976 verified decision-maker contacts tracked across these 17,476 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.