Company lists · Data refreshed September 2026

Top 25 Sdr outsourcing services worldwide

Name: Sdr outsourcing services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 11,622 companies tracked

RevenueBase identified 11,622 sdr outsourcing services worldwide as of September 2026 and tracks 129,204 professional contacts across them, including 14,408 with verified work emails. The United States is the largest market and London the largest hub.

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

11,622Companies

129,204Contacts tracked

14,408Verified emails

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The 25 largest sdr outsourcing services worldwide

Ranked by team size

Top 25 of 11,622 sdr outsourcing services worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sdr outsourcing 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	Liderança Serviços	Indirect evidence	São José, BrazilHQ checked Sep 29, 2026	10001+	4,504 contacts →
	Indirect evidence “Atuamos nos principais setores de terceirização, e somos pioneiros na implantação de contratos à distância.” Source: RevenueBase Database · checked Sep 29, 2026
2	Marketsource INC	Indirect evidence	Alpharetta, GA, United StatesHQ checked Sep 29, 2026	5,001-10,000	3,063 contacts →
	Indirect 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
3	Marketstar	Partial evidence	Ogden, UT, United StatesHQ checked Sep 29, 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 29, 2026
4	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
5	Webhelp Enterprise	Indirect evidence	Paris, FranceHQ checked Sep 29, 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 29, 2026
6	Cience	Indirect evidence	Miami, FL, United StatesHQ checked Sep 29, 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 29, 2026
7	Inelcom, Ingeniería Electrónica Comercial	Partial evidence	Pozuelo De Alarcón, SpainHQ checked Sep 29, 2026	1,001-5,000	1,007 contacts →
	Partial evidence “Specialized services in order to provide to other companies outsourcing for activities, improving its performance and cost.” Source: RevenueBase Database · checked Sep 29, 2026
8	Servestsa	Indirect evidence	Caracas, VenezuelaHQ checked Sep 29, 2026	n/a	865 contacts →
	Indirect evidence “Statistics first” Source: RevenueBase Database · checked Sep 29, 2026
9	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
10	Sourcefit	Indirect evidence	Quezon City, PhilippinesHQ checked Sep 29, 2026	1,001-5,000	813 contacts →
	Indirect evidence “Sourcefit is focused on providing custom offshore solutions.” Source: RevenueBase Database · checked Sep 29, 2026
11	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
12	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 29, 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 29, 2026
13	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 29, 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 29, 2026
14	Flexisales INC	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 29, 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 29, 2026
15	Girnar Care	Indirect evidence	Jaipur, IndiaHQ checked Sep 29, 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 29, 2026
16	Infinity	Indirect evidence	Cedar Rapids, IA, United StatesHQ checked Sep 29, 2026	501-1,000	609 contacts →
	Indirect evidence “Infinity is an award-winning inside sales agency and consulting firm with 30 years of experience helping B2B companies maximize sales and drive revenue.” Source: RevenueBase Database · checked Sep 29, 2026
17	Telenet Marketing Solutions	Indirect evidence	Athens, GA, IndiaHQ checked Sep 29, 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 29, 2026
18	Movingdneedle Pvt. LTD	Indirect evidence	Sterling Heights, MI, United StatesHQ checked Sep 29, 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 29, 2026
19	The Pipeline Group	Partial evidence	San Jose, CA, United StatesHQ checked Sep 29, 2026	201-500	523 contacts →
	Partial evidence “The Pipeline Group helps B2B tech companies scale pipeline fast through our SDR-as-a-Service model.” Source: RevenueBase Database · checked Sep 29, 2026
20	Shore360 INC	Indirect evidence	Clark, PhilippinesHQ checked Sep 29, 2026	1,001-5,000	517 contacts →
	Indirect evidence “At Shore360, we do offshoring differently.” Source: RevenueBase Database · checked Sep 29, 2026
21	Callbox INC	Indirect evidence	Encino, CA, United StatesHQ checked Sep 29, 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 29, 2026
22	Infoanalytica, INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 29, 2026	201-500	482 contacts →
	Indirect evidence “InfoAnalytica is a B2B sales acceleration partner for mid-market and enterprise companies.” Source: RevenueBase Database · checked Sep 29, 2026
23	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 29, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
24	Alliance Pdms	Indirect evidence	Hurst, TX, United StatesHQ checked Sep 29, 2026	51-200	428 contacts →
	Indirect evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 29, 2026
25	The Lead Market	Indirect evidence	Nagpur, IndiaHQ checked Sep 29, 2026	51-200	387 contacts →
	Indirect evidence “TLM empowers businesses to generate revenue through their qualified leads.” 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: sdr outsourcing 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 sdr outsourcing services.
Partial evidence: Its own public description names part of sdr outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sdr outsourcing 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 11,622 sdr outsourcing services worldwide

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Sdr outsourcing services worldwide at a glance

As of Sep 29, 2026

11.2%Verified-email coverage

11.1Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

6,684

11-50

3,474

51-200

1,082

201-500

244

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 sdr outsourcing 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 sdr outsourcing services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sdr outsourcing 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 sdr outsourcing 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 sdr outsourcing 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, 14,408 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.

Sdr outsourcing services by location

60 lists · largest first

Every Sdr outsourcing 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 sdr outsourcing 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 sdr outsourcing services are there worldwide?

RevenueBase identified 11,622 sdr outsourcing 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?

Liderança Serviços, headquartered in Sao Jose, tops this list with the largest team on record.

Which country has the most sdr outsourcing services?

The United States leads with 2,423 companies, followed by India (1,165) and the United Kingdom (893). Every sdr outsourcing services list by country and city is linked on this page.

Which city has the most sdr outsourcing services?

London leads with 320 headquartered companies, followed by Pune (229) and New York (126).

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 14,408 verified decision-maker contacts tracked across these 11,622 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.