Company lists · Data refreshed September 2026

Top 25 Client acquisition outsourcing companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 16,074 companies tracked

RevenueBase identified 16,074 client acquisition outsourcing companies worldwide as of September 2026 and tracks 184,881 professional contacts across them, including 20,495 with verified work emails. The United States is the largest market and London the largest hub.

This list covers client acquisition outsourcing companies 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 client acquisition outsourcing companies 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 27, 2026 86% judged on-target in blind review

16,074Companies

184,881Contacts tracked

20,495Verified emails

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The 25 largest client acquisition outsourcing companies worldwide

Ranked by team size

Top 25 of 16,074 client acquisition outsourcing companies worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to client acquisition outsourcing companies: 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 27, 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 27, 2026
2	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 27, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 27, 2026
3	Xdbs Worldwide	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 27, 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 27, 2026
4	Marketstar	Partial evidence	Ogden, UT, United StatesHQ checked Sep 27, 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 27, 2026
5	Transcosmos INC	Indirect evidence	Toshima-ku, JapanHQ checked Sep 27, 2026	10001+	1,987 contacts →
	Indirect evidence “transcosmos launched its operations in 1966.” Source: RevenueBase Database · checked Sep 27, 2026
6	Webhelp Enterprise	Partial evidence	Paris, FranceHQ checked Sep 27, 2026	10001+	1,795 contacts →
	Partial evidence “The Concentrix B2B sales practice is here to design, build and run projects for our clients.” Source: RevenueBase Database · checked Sep 27, 2026
7	Full Potential Solutions	Partial evidence	Waltham, MA, United StatesHQ checked Sep 27, 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 27, 2026
8	Credico	Strong evidence	Chicago, IL, United StatesHQ checked Sep 27, 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 27, 2026
9	Cience	Indirect evidence	Miami, FL, United StatesHQ checked Sep 27, 2026	201-500	1,068 contacts →
	Indirect evidence “CIENCE Technologies, Inc, founded in 2015 and headquartered in Denver, CO, is a pioneering global company in lead generation software and services, committed to transforming the…” Source: RevenueBase Database · checked Sep 27, 2026
10	Peak Support	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,036 contacts →
	Partial evidence “Peak Support: A Ubiquity Company is a business process outsourcing (BPO) company growing dedicated to providing exceptional support to high-growth companies.” Source: RevenueBase Database · checked Sep 27, 2026
11	Machbizz Marketers PVT LTD	Indirect evidence	Pune, IndiaHQ checked Sep 27, 2026	501-1,000	967 contacts →
	Indirect evidence “MachBizz is a mission itself with a strong urge to accomplish its vision of B2B Digital Marketing and lead generation.” Source: RevenueBase Database · checked Sep 27, 2026
12	Rewardsco	Indirect evidence	Durban, South AfricaHQ checked Sep 27, 2026	1,001-5,000	917 contacts →
	Indirect evidence “Our People.” Source: RevenueBase Database · checked Sep 27, 2026
13	Inktel Contact Center Solutions	Partial evidence	Doral, FL, United StatesHQ checked Sep 27, 2026	1,001-5,000	902 contacts →
	Partial 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 27, 2026
14	Infuse	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 27, 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 27, 2026
15	ZAZ Vendas	Indirect evidence	Campinas, BrazilHQ checked Sep 27, 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 27, 2026
16	Salelytics	Indirect evidence	Appleton, WI, United StatesHQ checked Sep 27, 2026	1,001-5,000	776 contacts →
	Indirect evidence “Salelytics is now MarketSource.” Source: RevenueBase Database · checked Sep 27, 2026
17	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 27, 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 27, 2026
18	Talksure	Indirect evidence	Durban, South AfricaHQ checked Sep 27, 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 27, 2026
19	Salebuild	Partial evidence	Redwood City, CA, United StatesHQ checked Sep 27, 2026	n/a	708 contacts →
	Partial evidence “Salesify, a leading provider of B2B demand generation services, helps our clients create pipeline and accelerate revenue by identifying, profiling, nurturing and connecting with…” Source: RevenueBase Database · checked Sep 27, 2026
20	Flexisales INC	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 27, 2026	201-500	697 contacts →
	Indirect evidence “Flexisales, is a global frontrunner in B2B Lead & Demand Generation and Data Services, serving technology companies & agencies worldwide.” Source: RevenueBase Database · checked Sep 27, 2026
21	Girnar Care	Indirect evidence	Jaipur, IndiaHQ checked Sep 27, 2026	501-1,000	649 contacts →
	Indirect evidence “We at Girnar Care work towards customer satisfaction and it is also a center of customer excellence.” Source: RevenueBase Database · checked Sep 27, 2026
22	Telenet Marketing Solutions	Indirect evidence	Athens, GA, IndiaHQ checked Sep 27, 2026	201-500	553 contacts →
	Indirect evidence “From initial market awareness to the final stages of a complex B2B buying journey, modern buyers crave authentic interaction.” Source: RevenueBase Database · checked Sep 27, 2026
23	Movingdneedle Pvt. LTD	Indirect evidence	Sterling Heights, MI, United StatesHQ checked Sep 27, 2026	51-200	528 contacts →
	Indirect evidence “movingDneedle is a Business to Business Sales Lead Generation Company that provides fast and scalable, sales qualified leads through its unique Personalized Email Marketing…” Source: RevenueBase Database · checked Sep 27, 2026
24	Callbox INC	Indirect evidence	Encino, CA, United StatesHQ checked Sep 27, 2026	201-500	499 contacts →
	Indirect evidence “Callbox is the #1 trusted lead generation services and AI-Powered Growth Strategy Partner by enterprise and scaling businesses in the USA, Canada, Asia Pacific, Latin America…” Source: RevenueBase Database · checked Sep 27, 2026
25	Transcosmos Asia Philippines INC	Indirect evidence	Pasig, PhilippinesHQ checked Sep 27, 2026	10001+	496 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: client acquisition outsourcing companies. 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 client acquisition outsourcing companies.
Partial evidence: Its own public description names part of client acquisition outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name client acquisition outsourcing companies. 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 16,074 client acquisition outsourcing companies worldwide

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Client acquisition outsourcing companies worldwide at a glance

As of Sep 27, 2026

11.1%Verified-email coverage

11.5Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

9,105

11-50

4,904

51-200

1,524

201-500

361

501-1,000

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 client acquisition outsourcing companies, 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 client acquisition outsourcing companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “client acquisition outsourcing companies”. 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 client acquisition outsourcing companies), 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 client acquisition outsourcing companies, 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, 20,495 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.

Client acquisition outsourcing companies by location

62 lists · largest first

Every Client acquisition outsourcing companies 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 client acquisition outsourcing companies, 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 client acquisition outsourcing companies are there worldwide?

RevenueBase identified 16,074 client acquisition outsourcing companies 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 client acquisition outsourcing companies?

The United States leads with 3,535 companies, followed by India (1,540) and the United Kingdom (1,183). Every client acquisition outsourcing companies list by country and city is linked on this page.

Which city has the most client acquisition outsourcing companies?

London leads with 420 headquartered companies, followed by Pune (384) and New York (192).

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 20,495 verified decision-maker contacts tracked across these 16,074 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.