Company lists · Data refreshed September 2026

Top 25 Outsourced lead qualification services worldwide

Name: Outsourced lead qualification services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 5,906 companies tracked

RevenueBase identified 5,906 outsourced lead qualification services worldwide as of September 2026 and tracks 43,733 professional contacts across them, including 4,460 with verified work emails. The United States is the largest market and London the largest hub.

This list covers outsourced lead qualification services 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 outsourced lead qualification services 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

5,906Companies

43,733Contacts tracked

4,460Verified emails

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The 25 largest outsourced lead qualification services worldwide

Ranked by team size

Top 25 of 5,906 outsourced lead qualification services worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to outsourced lead qualification services: 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	Cience	Partial evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	201-500	1,068 contacts →
	Partial 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 21, 2026
2	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 21, 2026	n/a	708 contacts →
	Indirect 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 21, 2026
3	Flexisales INC	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	201-500	697 contacts →
	Partial evidence “Flexisales, is a global frontrunner in B2B Lead & Demand Generation and Data Services, serving technology companies & agencies worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
4	Movingdneedle Pvt. LTD	Partial evidence	Sterling Heights, MI, United StatesHQ checked Sep 21, 2026	51-200	528 contacts →
	Partial 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 21, 2026
5	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 21, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
6	Qualifa	Partial evidence	Brighton, United KingdomHQ checked Sep 21, 2026	51-200	440 contacts →
	Partial evidence “We are an award winning multilingual lead generation and market research service provider for B2B publishing, marketing, events and tech companies.” Source: RevenueBase Database · checked Sep 21, 2026
7	Alliance Pdms	Partial evidence	Hurst, TX, United StatesHQ checked Sep 21, 2026	51-200	428 contacts →
	Partial evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 21, 2026
8	The Lead Market	Partial evidence	Nagpur, IndiaHQ checked Sep 21, 2026	51-200	387 contacts →
	Partial evidence “TLM empowers businesses to generate revenue through their qualified leads.” Source: RevenueBase Database · checked Sep 21, 2026
9	Beyond Codes INC	Partial evidence	Simi Valley, CA, United StatesHQ checked Sep 21, 2026	201-500	380 contacts →
	Partial evidence “Beyond Codes is a global B2B lead generation and appointment-setting agency trusted by some of the world's leading technology companies to build enterprise sales pipeline.” Source: RevenueBase Database · checked Sep 21, 2026
10	Lahaus	Partial evidence	Medellín, ColombiaHQ checked Sep 21, 2026	51-200	292 contacts →
	Partial evidence “Un solo sistema corre tus ads, habla con tus leads y te entrega clientes listos para cerrar.” Source: RevenueBase Database · checked Sep 21, 2026
11	Calltend INC	Strong evidence	Los Angeles, TX, United StatesHQ checked Sep 21, 2026	51-200	289 contacts →
	Strong evidence “Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: RevenueBase Database · checked Sep 21, 2026
12	Boomsourcing	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 21, 2026	501-1,000	256 contacts →
	Indirect evidence “Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: RevenueBase Database · checked Sep 21, 2026
13	Marketjoy, INC	Partial evidence	Pensacola, FL, United StatesHQ checked Sep 21, 2026	51-200	223 contacts →
	Partial evidence “Founded in 2016 and headquartered in Pensacola, Florida, MarketJoy is a B2B lead generation, appointment generation and sales development partner built to deliver predictable…” Source: RevenueBase Database · checked Sep 21, 2026
14	Leadguru	Partial evidence	Bucharest, RomaniaHQ checked Sep 21, 2026	n/a	208 contacts →
	Partial evidence “LEADGURU is a Digital Agency that focuses on Done-For-You Lead Generation services.” Source: RevenueBase Database · checked Sep 21, 2026
15	Trualliant Business Process Outsourcing INC	Indirect evidence	Iloilo City, PhilippinesHQ checked Sep 21, 2026	1,001-5,000	205 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
16	Channelgrowth	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	201-500	194 contacts →
	Partial evidence “ChannelGrowth provides B2B data acquisition, lead generation, prospecting, and sales teams at scale.” Source: RevenueBase Database · checked Sep 21, 2026
17	Dynamic BDC	Partial evidence	Troy, MI, United StatesHQ checked Sep 21, 2026	501-1,000	190 contacts →
	Partial evidence “Dynamic Marketing Services was created to cost effectively address the needs of Dealers who want to professionally handle their internet leads as well as their outbound sales and…” Source: RevenueBase Database · checked Sep 21, 2026
18	SM Services	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 21, 2026	n/a	187 contacts →
	Indirect evidence “Fundada em 2005, a SM Services é especializada em prospecção de mercado para vendas consultivas, oferecendo ao mercado diversos tipos de serviços geração de oportunidades de…” Source: RevenueBase Database · checked Sep 21, 2026
19	Concept Services	Partial evidence	Copley, OH, United StatesHQ checked Sep 21, 2026	51-200	185 contacts →
	Partial evidence “Concept develops and implements comprehensive B2B lead generation and sales development solutions for companies.” Source: RevenueBase Database · checked Sep 21, 2026
20	Dealforce	Indirect evidence	United StatesHQ checked Sep 21, 2026	n/a	155 contacts →
	Indirect evidence “At DealForce, we drive sales calls on a pay for performance model with interested, target market prospects.$0 upfront.” Source: RevenueBase Database · checked Sep 21, 2026
21	724care	Indirect evidence	Mandaue, PhilippinesHQ checked Sep 21, 2026	201-500	148 contacts →
	Indirect evidence “For 15 years, we steadily are providing face to face appointments to keep your sales people busy.” Source: RevenueBase Database · checked Sep 21, 2026
22	The Leadcrafters	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	127 contacts →
	Partial evidence “Established in 2015, Lead Crafters SalesTech Solutions is a reputable Information Technology Enabled Services organization.” Source: RevenueBase Database · checked Sep 21, 2026
23	Boom Demand	Partial evidence	Lehi, UT, United StatesHQ checked Sep 21, 2026	1,001-5,000	124 contacts →
	Partial evidence “Boom Demand is an Lead Generation & Customer Acquisition powerhouse that will help you increase revenue and grow your customer base.” Source: RevenueBase Database · checked Sep 21, 2026
24	NEXA	Strong evidence	Phoenix, AZ, United StatesHQ checked Sep 21, 2026	51-200	121 contacts →
	Strong evidence “Nexa Receptionists helps businesses convert and qualify more leads through 24/7/365 call answering, inbound and outbound sales, lead qualification, intake, live chat, and text…” Source: RevenueBase Database · checked Sep 21, 2026
25	GCL	Partial evidence	Birmingham, United KingdomHQ checked Sep 21, 2026	51-200	119 contacts →
	Partial evidence “GCL, with its unique, non-scripted approach to telemarketing and related marketing services, has for over 30 years established an enviable reputation for providing winning lead…” 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: outsourced lead qualification services. 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 outsourced lead qualification services.
Partial evidence: Its own public description names part of outsourced lead qualification services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsourced lead qualification services. 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 5,906 outsourced lead qualification services worldwide

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Outsourced lead qualification services worldwide at a glance

As of Sep 21, 2026

10.2%Verified-email coverage

7.4Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

3,566

11-50

1,686

51-200

499

201-500

112

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 outsourced lead qualification services, 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 outsourced lead qualification services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “outsourced lead qualification services”. 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 outsourced lead qualification services), 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 outsourced lead qualification services, 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, 4,460 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.

Outsourced lead qualification services by location

21 lists · largest first

Every Outsourced lead qualification services 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 outsourced lead qualification services, 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 outsourced lead qualification services are there worldwide?

RevenueBase identified 5,906 outsourced lead qualification services 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?

Cience, headquartered in Miami, tops this list with the largest team on record.

Which country has the most outsourced lead qualification services?

The United States leads with 1,401 companies, followed by India (547) and the United Kingdom (428). Every outsourced lead qualification services list by country and city is linked on this page.

Which city has the most outsourced lead qualification services?

London leads with 143 headquartered companies, followed by Pune (129) and Paris (73).

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 4,460 verified decision-maker contacts tracked across these 5,906 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.