Company lists · Data refreshed September 2026

Top 25 Customer acquisition outsourcing firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 15,414 companies tracked

RevenueBase identified 15,414 customer acquisition outsourcing firms worldwide as of September 2026 and tracks 234,886 professional contacts across them, including 22,532 with verified work emails. The United States is the largest market and Pune the largest hub.

This list covers customer acquisition 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 acquisition 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

15,414Companies

234,886Contacts tracked

22,532Verified emails

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The 25 largest customer acquisition outsourcing firms worldwide

Ranked by team size

Top 25 of 15,414 customer acquisition 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 acquisition 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	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
2	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
3	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 28, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 28, 2026
4	Xdbs Worldwide	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 2026	1,001-5,000	3,498 contacts →
	Indirect evidence “At XDBS, we primarily work with media agencies, publishers and marketing companies looking to leverage marketing automation and digital marketing capacity and capability to…” Source: RevenueBase Database · checked Sep 28, 2026
5	Advanced Call Center Technologies, LLC	Indirect evidence	Berwyn, PA, United StatesHQ checked Sep 28, 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 28, 2026
6	Stream Global Services	Partial evidence	Eagan, MN, United StatesHQ checked Sep 28, 2026	10001+	2,772 contacts →
	Partial evidence “Stream Global Services is a premium business process outsource (BPO) service provider specializing in customer relationship management solutions including sales, customer care…” Source: RevenueBase Database · checked Sep 28, 2026
7	Marketstar	Partial evidence	Ogden, UT, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,446 contacts →
	Partial evidence “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: RevenueBase Database · checked Sep 28, 2026
8	Alta Resources	Indirect evidence	Neenah, WI, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,046 contacts →
	Indirect evidence “Alta Resources has always worked to be something different.” Source: RevenueBase Database · checked Sep 28, 2026
9	Transcosmos INC	Indirect evidence	Toshima-ku, JapanHQ checked Sep 28, 2026	10001+	1,987 contacts →
	Indirect evidence “transcosmos launched its operations in 1966.” Source: RevenueBase Database · checked Sep 28, 2026
10	Allied Global	Indirect evidence	GuatemalaHQ checked Sep 28, 2026	5,001-10,000	1,979 contacts →
	Indirect evidence “Regardless of your Company’s size (from Start-ups to Fortune 500), business vertical or service requirements, we act as a seamless extension of your team to help you grow, and…” Source: RevenueBase Database · checked Sep 28, 2026
11	Webhelp Enterprise	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	10001+	1,795 contacts →
	Indirect evidence “The Concentrix B2B sales practice is here to design, build and run projects for our clients.” Source: RevenueBase Database · checked Sep 28, 2026
12	Support Services Group	Partial evidence	Waco, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,710 contacts →
	Partial evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 28, 2026
13	BRM S.A.S	Indirect evidence	Bogotá, ColombiaHQ checked Sep 28, 2026	1,001-5,000	1,363 contacts →
	Indirect evidence “Las conexiones más poderosas surgen de interacciones sencillas que marcan la diferencia.” Source: RevenueBase Database · checked Sep 28, 2026
14	Full Potential Solutions	Partial evidence	Waltham, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,238 contacts →
	Partial evidence “Full Potential Solutions (FPS) is a new kind of performance-based outsourcing firm that puts culture and employees first, because we believe that happy, fulfilled teams accomplish…” Source: RevenueBase Database · checked Sep 28, 2026
15	The Office Gurus	Partial evidence	St Petersburg, FL, RussiaHQ checked Sep 28, 2026	1,001-5,000	1,198 contacts →
	Partial evidence “The Office Gurus (TOG) is a global call center and business process outsource provider of customer care, telemarketing, lead generation, appointment setting, order entry, accounts…” Source: RevenueBase Database · checked Sep 28, 2026
16	Credico	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	n/a	1,188 contacts →
	Strong evidence “Credico is the world's leading face-to-face customer acquisition agency, helping our clients attract and retain loyal customers.” Source: RevenueBase Database · checked Sep 28, 2026
17	Rewardsco	Indirect evidence	Durban, South AfricaHQ checked Sep 28, 2026	1,001-5,000	917 contacts →
	Indirect evidence “Our People.” Source: RevenueBase Database · checked Sep 28, 2026
18	Inktel Contact Center Solutions	Indirect evidence	Doral, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	902 contacts →
	Indirect evidence “Our Company Inktel is a leading business process outsourcer that specializes in creating personalized call center solutions which enable our clients to increase market share…” Source: RevenueBase Database · checked Sep 28, 2026
19	Infuse	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	796 contacts →
	Indirect evidence “Demand Excellence Delivered We are INFUSE, a global B2B demand and revenue marketing performance company.” Source: RevenueBase Database · checked Sep 28, 2026
20	ZAZ Vendas	Indirect evidence	Campinas, BrazilHQ checked Sep 28, 2026	501-1,000	796 contacts →
	Indirect evidence “Em um mercado cada vez mais competitivo, onde a eficiência em vendas massificadas e externas é um desafio constante, a ZAZ Vendas surge como a resposta definitiva.” Source: RevenueBase Database · checked Sep 28, 2026
21	Salelytics	Indirect evidence	Appleton, WI, United StatesHQ checked Sep 28, 2026	1,001-5,000	776 contacts →
	Indirect evidence “Salelytics is now MarketSource.” Source: RevenueBase Database · checked Sep 28, 2026
22	Manlitics B2B Ites	Indirect evidence	New York, United StatesHQ checked Sep 28, 2026	501-1,000	750 contacts →
	Indirect evidence “In an ERA of new and emerging digital mediums, we align our core expertise of today’s ever-changing technology with a clear understanding of traditional marketing methods without…” Source: RevenueBase Database · checked Sep 28, 2026
23	Anteriad	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	740 contacts →
	Indirect evidence “Data Driven.” Source: RevenueBase Database · checked Sep 28, 2026
24	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 28, 2026	501-1,000	724 contacts →
	Indirect evidence “We book the qualified meetings that fill your pipeline for any B2B company ready to grow.” Source: RevenueBase Database · checked Sep 28, 2026
25	Talksure	Indirect evidence	Durban, South AfricaHQ checked Sep 28, 2026	501-1,000	718 contacts →
	Indirect evidence “Established in 2010, Talksure has developed a reputation for being a respected financial services provider and outsource business services partner.” 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 acquisition 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 acquisition outsourcing firms.
Partial evidence: Its own public description names part of customer acquisition 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 acquisition 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 15,414 customer acquisition outsourcing firms worldwide

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Customer acquisition outsourcing firms worldwide at a glance

As of Sep 28, 2026

9.6%Verified-email coverage

15.2Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · Pune

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

7,610

11-50

5,117

51-200

1,904

201-500

514

501-1,000

134

1,001-5,000

5,001-10,000

10001+

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 acquisition 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 acquisition outsourcing firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “customer acquisition 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 acquisition 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 acquisition 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, 22,532 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 acquisition outsourcing firms by location

80 lists · largest first

Every Customer acquisition 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 acquisition 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 acquisition outsourcing firms are there worldwide?

RevenueBase identified 15,414 customer acquisition 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?

IBEX, headquartered in Washington, tops this list with the largest team on record.

Which country has the most customer acquisition outsourcing firms?

The United States leads with 3,396 companies, followed by India (1,645) and the United Kingdom (1,082). Every customer acquisition outsourcing firms list by country and city is linked on this page.

Which city has the most customer acquisition outsourcing firms?

Pune leads with 401 headquartered companies, followed by London (339) and New York (171).

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 22,532 verified decision-maker contacts tracked across these 15,414 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.