Company lists · Data refreshed September 2026

Top 25 Customer agencies worldwide

Name: Customer agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 12,899 companies tracked

RevenueBase identified 12,899 customer agencies worldwide as of September 2026 and tracks 1,073,631 professional contacts across them, including 114,563 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers customer agencies 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 21, 2026. Country and city lists for customer agencies 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 21, 2026 86% judged on-target in blind review

12,899Companies

1,073,631Contacts tracked

114,563Verified emails

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The 25 largest customer agencies worldwide

Ranked by team size

Top 25 of 12,899 customer agencies worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to customer agencies: 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 21, 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 21, 2026
2	Alorica	Strong evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	10001+	47,558 contacts →
	Strong evidence “We’re passionate about creating customers for life by designing experiences that elevate your brand.” Source: RevenueBase Database · checked Sep 21, 2026
3	Sitel Group	Strong evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	10001+	35,365 contacts →
	Strong evidence “Foundever™ is a global leader in the customer experience (CX) industry.” Source: RevenueBase Database · checked Sep 21, 2026
4	TTEC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	10001+	26,420 contacts →
	Indirect evidence “We’re TTEC (pronounced t.tec).” Source: RevenueBase Database · checked Sep 21, 2026
5	Konecta	Strong evidence	Madrid, SpainHQ checked Sep 21, 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 21, 2026
6	AEC	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 21, 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 21, 2026
7	IQOR	Strong evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 21, 2026	10001+	17,310 contacts →
	Strong 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 21, 2026
8	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
9	Startek	Strong evidence	Denver, United StatesHQ checked Sep 21, 2026	10001+	14,976 contacts →
	Strong 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 21, 2026
10	Ienergizer	Strong evidence	Noida, IndiaHQ checked Sep 21, 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 21, 2026
11	VXI Global Solutions	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	10001+	14,238 contacts →
	Strong 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 21, 2026
12	Intelcia	Indirect evidence	Casablanca, MoroccoHQ checked Sep 21, 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 21, 2026
13	Transcom	Strong evidence	Stockholm, SwedenHQ checked Sep 21, 2026	10001+	12,955 contacts →
	Strong evidence “Transcom provides digitally enhanced customer experience (CX) services to some of the world's most ambitious brands.” Source: RevenueBase Database · checked Sep 21, 2026
14	Slalom	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	10001+	10,032 contacts →
	Indirect evidence “Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always.” Source: RevenueBase Database · checked Sep 21, 2026
15	Comdata Group	Indirect evidence	Corsico, ItalyHQ checked Sep 21, 2026	10001+	9,614 contacts →
	Indirect evidence “We're KONECTA now!” Source: RevenueBase Database · checked Sep 21, 2026
16	Intouchcx	Indirect evidence	Winnipeg, MB, CanadaHQ checked Sep 21, 2026	10001+	8,992 contacts →
	Indirect evidence “We are IntouchCX, where innovation meets industry, where dreamers meet doers, and where scale meets soul.” Source: RevenueBase Database · checked Sep 21, 2026
17	Algar Tech	Indirect evidence	Uberlândia, BrazilHQ checked Sep 21, 2026	5,001-10,000	8,292 contacts →
	Indirect evidence “Somos a Algar Tech CX.” Source: RevenueBase Database · checked Sep 21, 2026
18	Cogent E Services	Strong evidence	Noida, IndiaHQ checked Sep 21, 2026	10001+	7,313 contacts →
	Strong 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 21, 2026
19	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 21, 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 21, 2026
20	Everise	Strong evidence	Plantation, FL, United StatesHQ checked Sep 21, 2026	10001+	5,863 contacts →
	Strong evidence “Everise delivers happiness to millions of customers around the world.” Source: RevenueBase Database · checked Sep 21, 2026
21	Qualfon	Strong evidence	Highland Park, MI, United StatesHQ checked Sep 21, 2026	10001+	5,840 contacts →
	Strong 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
22	Afni, INC	Indirect evidence	Bloomington, IL, United StatesHQ checked Sep 21, 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 21, 2026
23	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 21, 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 21, 2026
24	Fusion CX	Strong evidence	Norcross, GA, United StatesHQ checked Sep 21, 2026	10001+	4,785 contacts →
	Strong evidence “At Fusion CX, we revolutionize customer experience by blending innovative technology and human connection.” Source: RevenueBase Database · checked Sep 21, 2026
25	Eficacia	Indirect evidence	Cali, ColombiaHQ checked Sep 21, 2026	10001+	4,692 contacts →
	Indirect evidence “Incrementamos la productividad y eficiencia de nuestros clientes- Más de 40 años de experiencia en el mercado- Líderes en Soluciones de Mercadeo, Trade Marketing, Ventas y Gestión…” 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 agencies. 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 agencies.
Partial evidence: Its own public description names part of customer agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer agencies. 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 12,899 customer agencies worldwide

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Customer agencies worldwide at a glance

As of Sep 21, 2026

10.7%Verified-email coverage

83.2Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Sao Paulo

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

4,593

11-50

3,839

51-200

2,359

201-500

937

501-1,000

430

1,001-5,000

467

5,001-10,000

106

10001+

140

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 agencies, 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 agencies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “customer agencies”. 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 agencies), 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 agencies, 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, 114,563 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 agencies by location

67 lists · largest first

Every Customer agencies 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 agencies, 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 agencies are there worldwide?

RevenueBase identified 12,899 customer agencies 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 agencies?

The United States leads with 2,539 companies, followed by India (951) and Brazil (597). Every customer agencies list by country and city is linked on this page.

Which city has the most customer agencies?

Sao Paulo leads with 210 headquartered companies, followed by London (200) and Lahore (178).

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 114,563 verified decision-maker contacts tracked across these 12,899 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.