Company lists · Data refreshed September 2026

Top 25 Contract call centers worldwide

Name: Contract call centers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 10,089 companies tracked

RevenueBase identified 10,089 contract call centers worldwide as of September 2026 and tracks 909,318 professional contacts across them, including 78,476 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers contract call centers 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 27, 2026. Country and city lists for contract call centers 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 27, 2026 86% judged on-target in blind review

10,089Companies

909,318Contacts tracked

78,476Verified emails

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The 25 largest contract call centers worldwide

Ranked by team size

Top 25 of 10,089 contract call centers worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to contract call centers: 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	Madrid, MexicoHQ checked Sep 27, 2026	10001+	77,129 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 27, 2026
2	Alorica	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 27, 2026	10001+	47,558 contacts →
	Indirect evidence “We’re passionate about creating customers for life by designing experiences that elevate your brand.” Source: RevenueBase Database · checked Sep 27, 2026
3	Sitel Group	Indirect evidence	Miami, FL, United StatesHQ checked Sep 27, 2026	10001+	35,365 contacts →
	Indirect evidence “Foundever™ is a global leader in the customer experience (CX) industry.” Source: RevenueBase Database · checked Sep 27, 2026
4	TTEC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 27, 2026	10001+	26,420 contacts →
	Indirect evidence “We’re TTEC (pronounced t.tec).” Source: RevenueBase Database · checked Sep 27, 2026
5	Konecta	Indirect evidence	Madrid, SpainHQ checked Sep 27, 2026	10001+	23,763 contacts →
	Indirect 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 27, 2026
6	AEC	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 27, 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 27, 2026
7	IBEX	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	10001+	15,457 contacts →
	Indirect 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 27, 2026
8	Startek	Indirect evidence	Denver, United StatesHQ checked Sep 27, 2026	10001+	14,976 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 27, 2026
9	Ienergizer	Indirect evidence	Noida, IndiaHQ checked Sep 27, 2026	10001+	14,745 contacts →
	Indirect 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 27, 2026
10	VXI Global Solutions	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	10001+	14,238 contacts →
	Indirect 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 27, 2026
11	Intelcia	Indirect evidence	Casablanca, MoroccoHQ checked Sep 27, 2026	10001+	13,214 contacts →
	Indirect 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 27, 2026
12	Comdata Group	Indirect evidence	Corsico, ItalyHQ checked Sep 27, 2026	10001+	9,614 contacts →
	Indirect evidence “We're KONECTA now!” Source: RevenueBase Database · checked Sep 27, 2026
13	Cogent E Services	Indirect evidence	Noida, IndiaHQ checked Sep 27, 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 27, 2026
14	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 27, 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 27, 2026
15	Everise	Indirect evidence	Plantation, FL, United StatesHQ checked Sep 27, 2026	10001+	5,863 contacts →
	Indirect evidence “Everise delivers happiness to millions of customers around the world.” Source: RevenueBase Database · checked Sep 27, 2026
16	Afni, INC	Partial evidence	Bloomington, IL, United StatesHQ checked Sep 27, 2026	10001+	5,553 contacts →
	Partial 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 27, 2026
17	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 27, 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 27, 2026
18	Call Center Services International	Partial evidence	San Diego, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	4,561 contacts →
	Partial 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 27, 2026
19	Apex America	Indirect evidence	Córdoba, ArgentinaHQ checked Sep 27, 2026	10001+	4,377 contacts →
	Indirect 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 27, 2026
20	Mindbridge	Indirect evidence	Lahore, PakistanHQ checked Sep 27, 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 27, 2026
21	Continuum Global Solutions	Partial evidence	Dallas, TX, United StatesHQ checked Sep 27, 2026	5,001-10,000	4,342 contacts →
	Partial 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 27, 2026
22	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 27, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 27, 2026
23	Callink	Strong evidence	Uberlândia, BrazilHQ checked Sep 27, 2026	5,001-10,000	4,126 contacts →
	Strong evidence “Mais que call center: soluções que transformam o seu negócio e a jornada dos clientes!” Source: RevenueBase Database · checked Sep 27, 2026
24	Raya CX	Indirect evidence	Giza, EgyptHQ checked Sep 27, 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 27, 2026
25	Brasil Center Comunicações	Indirect evidence	n/a	5,001-10,000	3,979 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 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: contract call centers. 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 contract call centers.
Partial evidence: Its own public description names part of contract call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contract call centers. 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 10,089 contract call centers worldwide

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Contract call centers worldwide at a glance

As of Sep 27, 2026

8.6%Verified-email coverage

90.1Average contacts per company

11-50Median size (employees)

2.0%Largest-city concentration · Lahore

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

1,750

11-50

3,395

51-200

2,676

201-500

1,084

501-1,000

503

1,001-5,000

468

5,001-10,000

10001+

103

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 contract call centers, 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 contract call centers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “contract call centers”. 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 contract call centers), 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 contract call centers, 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, 78,476 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 27, 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.

Contract call centers by location

60 lists · largest first

Every Contract call centers 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 contract call centers, 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 contract call centers are there worldwide?

RevenueBase identified 10,089 contract call centers 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 contract call centers?

The United States leads with 1,670 companies, followed by India (846) and Pakistan (669). Every contract call centers list by country and city is linked on this page.

Which city has the most contract call centers?

Lahore leads with 204 headquartered companies, followed by Rawalpindi (141) and Karachi (106).

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 78,476 verified decision-maker contacts tracked across these 10,089 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 27, 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.