Company lists · Data refreshed September 2026

Top 25 Sales process outsourcing firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 13,097 companies tracked

RevenueBase identified 13,097 sales process outsourcing firms worldwide as of September 2026 and tracks 197,797 professional contacts across them, including 21,176 with verified work emails. The United States is the largest market and London the largest hub.

This list covers sales process 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 29, 2026. Country and city lists for sales process 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 29, 2026 86% judged on-target in blind review

13,097Companies

197,797Contacts tracked

21,176Verified emails

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The 25 largest sales process outsourcing firms worldwide

Ranked by team size

Top 25 of 13,097 sales process outsourcing firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sales process 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	Ienergizer	Strong evidence	Noida, IndiaHQ checked Sep 29, 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 29, 2026
2	V4 Company	Partial evidence	Campinas, BrazilHQ checked Sep 29, 2026	1,001-5,000	5,079 contacts →
	Partial evidence “Somos uma assessoria de marketing focada em construir e otimizar o processo de vendas através da internet conectando pessoas que geram resultados com empresas que buscam vender…” Source: RevenueBase Database · checked Sep 29, 2026
3	Apex America	Indirect evidence	Córdoba, ArgentinaHQ checked Sep 29, 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 29, 2026
4	Salesland	Partial evidence	Madrid, MexicoHQ checked Sep 29, 2026	10001+	4,245 contacts →
	Partial evidence “We are Sales Specialists.” Source: RevenueBase Database · checked Sep 29, 2026
5	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 29, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 29, 2026
6	Armatis	Strong evidence	Paris, FranceHQ checked Sep 29, 2026	5,001-10,000	3,545 contacts →
	Strong 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 29, 2026
7	Marketsource INC	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 29, 2026	5,001-10,000	3,063 contacts →
	Partial evidence “MarketSource, an Allegis Group company, is a sales acceleration company focused on delivering better outcomes for many of the world’s most iconic brands.” Source: RevenueBase Database · checked Sep 29, 2026
8	Stream Global Services	Strong evidence	Eagan, MN, United StatesHQ checked Sep 29, 2026	10001+	2,772 contacts →
	Strong 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 29, 2026
9	Marketstar	Strong evidence	Ogden, UT, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,446 contacts →
	Strong evidence “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: RevenueBase Database · checked Sep 29, 2026
10	Denave	Indirect evidence	Noida, IndiaHQ checked Sep 29, 2026	5,001-10,000	2,270 contacts →
	Indirect evidence “We are revenue AI-X-lerators.” Source: RevenueBase Database · checked Sep 29, 2026
11	Alta Resources	Indirect evidence	Neenah, WI, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,046 contacts →
	Indirect evidence “Alta Resources has always worked to be something different.” Source: RevenueBase Database · checked Sep 29, 2026
12	Allied Global	Indirect evidence	GuatemalaHQ checked Sep 29, 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 29, 2026
13	Webhelp Enterprise	Partial evidence	Paris, FranceHQ checked Sep 29, 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 29, 2026
14	BDS Connected Solutions, LLC	Partial evidence	Lake Forest, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,530 contacts →
	Partial evidence “BDS Connected Solutions offers a complete suite of solutions that blend Advocacy, Assisted Sales, Training, Virtual, Retail, Experiential, Merchandising, Break Fix, Installations…” Source: RevenueBase Database · checked Sep 29, 2026
15	Full Potential Solutions	Partial evidence	Waltham, MA, United StatesHQ checked Sep 29, 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 29, 2026
16	The Office Gurus	Partial evidence	St Petersburg, FL, RussiaHQ checked Sep 29, 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 29, 2026
17	T-Roc	Partial evidence	Coral Gables, FL, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,135 contacts →
	Partial evidence “The Revenue Optimization Companies (T-ROC) is home to four sales solutions companies that enable clients to fulfill all of their sales performance needs.” Source: RevenueBase Database · checked Sep 29, 2026
18	Peak Support	Strong evidence	Cambridge, MA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,036 contacts →
	Strong 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 29, 2026
19	Rewardsco	Indirect evidence	Durban, South AfricaHQ checked Sep 29, 2026	1,001-5,000	917 contacts →
	Indirect evidence “Our People.” Source: RevenueBase Database · checked Sep 29, 2026
20	Inktel Contact Center Solutions	Partial evidence	Doral, FL, United StatesHQ checked Sep 29, 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 29, 2026
21	Horatio	Partial evidence	New York, United StatesHQ checked Sep 29, 2026	1,001-5,000	860 contacts →
	Partial evidence “Horatio is a premier, tech-enabled outsourcing partner helping ambitious companies scale customer experience and complex business operations without compromising quality…” Source: RevenueBase Database · checked Sep 29, 2026
22	Memoryblue	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 29, 2026	501-1,000	825 contacts →
	Indirect evidence “memoryBlue is the go-to partner for revenue leaders in B2B Tech looking to grow their pipeline engine.” Source: RevenueBase Database · checked Sep 29, 2026
23	Dash BPO	Indirect evidence	United StatesHQ checked Sep 29, 2026	1,001-5,000	814 contacts →
	Indirect evidence “DASH BPO, LLC is a global leader in delivering best-in-class first party solutions for its strategic partners.” Source: RevenueBase Database · checked Sep 29, 2026
24	ZAZ Vendas	Indirect evidence	Campinas, BrazilHQ checked Sep 29, 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 29, 2026
25	CPM International	Strong evidence	Thame, United KingdomHQ checked Sep 29, 2026	10001+	777 contacts →
	Strong evidence “CPM is an international sales outsourcing and customer experience agency.” Source: RevenueBase Database · checked Sep 29, 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: sales process 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 sales process outsourcing firms.
Partial evidence: Its own public description names part of sales process outsourcing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sales process 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 13,097 sales process outsourcing firms worldwide

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Sales process outsourcing firms worldwide at a glance

As of Sep 29, 2026

10.7%Verified-email coverage

15.1Average contacts per company

1-10Median size (employees)

2.2%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

7,317

11-50

3,783

51-200

1,398

201-500

364

501-1,000

117

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 sales process 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 sales process outsourcing firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sales process 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 sales process 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 sales process 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, 21,176 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 29, 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.

Sales process outsourcing firms by location

68 lists · largest first

Every Sales process 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 sales process 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 sales process outsourcing firms are there worldwide?

RevenueBase identified 13,097 sales process 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?

Ienergizer, headquartered in Noida, tops this list with the largest team on record.

Which country has the most sales process outsourcing firms?

The United States leads with 2,587 companies, followed by India (1,136) and the United Kingdom (848). Every sales process outsourcing firms list by country and city is linked on this page.

Which city has the most sales process outsourcing firms?

London leads with 286 headquartered companies, followed by Pune (212) and Sao Paulo (149).

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 21,176 verified decision-maker contacts tracked across these 13,097 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 29, 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.