Company lists · Data refreshed September 2026

Top 25 Customer service consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 34,509 companies tracked

RevenueBase identified 34,509 customer service consulting firms worldwide as of September 2026 and tracks 384,986 professional contacts across them, including 79,748 with verified work emails and 50,450 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers customer service consulting 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 24, 2026. Country and city lists for customer service consulting 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 24, 2026 86% judged on-target in blind review

34,509Companies

384,986Contacts tracked

79,748Verified emails

50,450Mobile numbers

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The 25 largest customer service consulting firms worldwide

Ranked by team size

Top 25 of 34,509 customer service consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to customer service consulting 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	Alorica	Partial evidence	Irvine, CA, United StatesHQ checked Sep 24, 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 24, 2026
2	Slalom	Partial evidence	Seattle, WA, United StatesHQ checked Sep 24, 2026	10001+	10,032 contacts →
	Partial 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 24, 2026
3	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 24, 2026	5,001-10,000	8,779 contacts →
	Partial evidence “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Source: RevenueBase Database · checked Sep 24, 2026
4	Everise	Partial evidence	Plantation, FL, United StatesHQ checked Sep 24, 2026	10001+	5,863 contacts →
	Partial evidence “Everise delivers happiness to millions of customers around the world.” Source: RevenueBase Database · checked Sep 24, 2026
5	Qualfon	Partial evidence	Highland Park, MI, United StatesHQ checked Sep 24, 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 24, 2026
6	Accenture Strategy & Consulting	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 24, 2026	5,001-10,000	5,514 contacts →
	Indirect evidence “Accenture Strategy combines deep industry expertise, advanced analytics capabilities and human-led design methodologies that enable clients to act with speed and confidence.” Source: RevenueBase Database · checked Sep 24, 2026
7	Fusion CX	Partial evidence	Norcross, GA, United StatesHQ checked Sep 24, 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 24, 2026
8	Management Solutions	Partial evidence	Madrid, SpainHQ checked Sep 24, 2026	1,001-5,000	4,468 contacts →
	Partial evidence “Management Solutions is a leading provider of business consulting services for regulated industries.” Source: RevenueBase Database · checked Sep 24, 2026
9	Apex America	Partial evidence	Córdoba, ArgentinaHQ checked Sep 24, 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 24, 2026
10	Callink	Indirect evidence	Uberlândia, BrazilHQ checked Sep 24, 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 24, 2026
11	SX Negócios	Indirect evidence	Novo Hamburgo, BrazilHQ checked Sep 24, 2026	5,001-10,000	4,020 contacts →
	Indirect evidence “Somos a Pulse Client Experts, uma empresa em constante evolução, impulsionados pela vontade de fazer acontecer.” Source: RevenueBase Database · checked Sep 24, 2026
12	Harte Hanks	Partial evidence	Chelmsford, MA, United StatesHQ checked Sep 24, 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 24, 2026
13	GSS Global Sales Solutions	Indirect evidence	Madrid, SpainHQ checked Sep 24, 2026	10001+	3,716 contacts →
	Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 24, 2026
14	Armatis	Partial evidence	Paris, FranceHQ checked Sep 24, 2026	5,001-10,000	3,545 contacts →
	Partial evidence “For 40 years, Armatis, European expert in customer relationship and process outsourcing, has been transforming brands' ambitions into tangible and measurable results.” Source: RevenueBase Database · checked Sep 24, 2026
15	Advanced Call Center Technologies, LLC	Indirect evidence	Berwyn, PA, United StatesHQ checked Sep 24, 2026	5,001-10,000	2,774 contacts →
	Indirect 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 24, 2026
16	TAHTO	Partial evidence	Goiânia, BrazilHQ checked Sep 24, 2026	10001+	2,552 contacts →
	Partial evidence “Com 19 anos de experiência em CX e BPO, somos consultivos e entregamos soluções personalizadas que conectam pessoas e tecnologia para impulsionar seus resultados.” Source: RevenueBase Database · checked Sep 24, 2026
17	TSA Group - Australia	Indirect evidence	West Perth, AustraliaHQ checked Sep 24, 2026	1,001-5,000	1,818 contacts →
	Indirect evidence “We’re Australia’s leading specialists in CX consultancy and services.” Source: RevenueBase Database · checked Sep 24, 2026
18	Op360 Officepartners360	Partial evidence	Ridgefield, CT, United StatesHQ checked Sep 24, 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 24, 2026
19	MCA	Partial evidence	Westport, CT, United StatesHQ checked Sep 24, 2026	n/a	1,650 contacts →
	Partial evidence “MCAworks is a strategic marketing consulting firm passionately dedicated to helping our clients accelerate and sustain business growth.” Source: RevenueBase Database · checked Sep 24, 2026
20	Huntswood	Indirect evidence	Reading, United KingdomHQ checked Sep 24, 2026	1,001-5,000	1,622 contacts →
	Indirect evidence “We are Huntswood.” Source: RevenueBase Database · checked Sep 24, 2026
21	Argano	Indirect evidence	Plano, TX, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,603 contacts →
	Indirect evidence “Argano is the world’s first and largest digital services consultancy focused exclusively on enabling high performance across our clients’ business operations, at scale and around…” Source: RevenueBase Database · checked Sep 24, 2026
22	Grupo Unísono	Partial evidence	Madrid, SpainHQ checked Sep 24, 2026	n/a	1,306 contacts →
	Partial evidence “At Unisono, for more than 20 years we have been working side by side with our customers across the globe to meet their demands as well as our own.” Source: RevenueBase Database · checked Sep 24, 2026
23	Concilig	Indirect evidence	Bauru, BrazilHQ checked Sep 24, 2026	5,001-10,000	1,279 contacts →
	Indirect evidence “A Concilig construiu uma reputação inquestionável com grandes empresas brasileiras por ser embasada por muita tecnologia e por eficácia na prestação de serviços que oferece.” Source: RevenueBase Database · checked Sep 24, 2026
24	Servion Global Solutions	Strong evidence	Princeton, NJ, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,250 contacts →
	Strong evidence “Servion is a CX Consulting and global systems integrator (SI) headquartered in the United States, with over three decades in customer experience (CX) transformation.” Source: RevenueBase Database · checked Sep 24, 2026
25	Cosmote Evalue	Indirect evidence	Athens, GreeceHQ checked Sep 24, 2026	5,001-10,000	1,235 contacts →
	Indirect evidence “Empowering growth.” Source: RevenueBase Database · checked Sep 24, 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 consulting 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 consulting firms.
Partial evidence: Its own public description names part of customer service consulting 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 consulting 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 34,509 customer service consulting firms worldwide

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Customer service consulting firms worldwide at a glance

As of Sep 24, 2026

20.7%Verified-email coverage

13.1%Mobile-number coverage

11.2Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · Sao Paulo

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

26,616

11-50

5,877

51-200

1,293

201-500

310

501-1,000

129

1,001-5,000

109

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 customer service consulting 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: 38 countries, largest first: the United States, Brazil, the United Kingdom, France, Germany, Canada, Spain, Italy, Australia, Mexico and 28 more. Country and city lists for customer service consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “customer service consulting 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 consulting 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 consulting 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, 79,748 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 24, 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 consulting firms by location

153 lists · largest first

Every Customer service consulting 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 consulting 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 consulting firms are there worldwide?

RevenueBase identified 34,509 customer service consulting 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?

Alorica, headquartered in Irvine, tops this list with the largest team on record.

Which country has the most customer service consulting firms?

The United States leads with 11,923 companies, followed by Brazil (3,238) and the United Kingdom (2,690). Every customer service consulting firms list by country and city is linked on this page.

Which city has the most customer service consulting firms?

Sao Paulo leads with 903 headquartered companies, followed by London (878) and Paris (634).

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 79,748 verified decision-maker contacts tracked across these 34,509 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 24, 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.