Company lists · Data refreshed September 2026

Top 25 Inside sales outsourcers based in the United States

Name: Inside sales outsourcers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 2,373 companies tracked

RevenueBase identified 2,373 inside sales outsourcers headquartered in the United States as of September 2026 and tracks 56,902 professional contacts across them, including 7,299 with verified work emails. New York is the largest hub.

This list covers inside sales outsourcers headquartered in the United States, 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.

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

2,373Companies

56,902Contacts tracked

7,299Verified emails

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The 25 largest inside sales outsourcers based in the United States

Ranked by team size

Top 25 of 2,373 inside sales outsourcers based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to inside sales outsourcers: 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	Advanced Call Center Technologies, LLC	Partial evidence	Berwyn, PA, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,774 contacts →
	Partial 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
2	Stream Global Services	Strong evidence	Eagan, MN, United StatesHQ checked Sep 28, 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 28, 2026
3	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
4	Full Potential Solutions	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,238 contacts →
	Indirect 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
5	Information Evolution, INC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	501-1,000	1,238 contacts →
	Indirect evidence “We are a boutique outsourcing firm specializing in keeping our customers' databases up-to-date, accurate, and as robust as possible.” Source: RevenueBase Database · checked Sep 28, 2026
6	Transparent BPO	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	972 contacts →
	Indirect evidence “Transparent BPO was founded to provide its clients with superior nearshore contact center services and business process outsourcing at competitive pricing.” Source: RevenueBase Database · checked Sep 28, 2026
7	Inktel Contact Center Solutions	Partial evidence	Doral, FL, United StatesHQ checked Sep 28, 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 28, 2026
8	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 28, 2026	501-1,000	883 contacts →
	Indirect evidence “If you are interested in growing your business or increasing efficiency, AnswerNet has the expertise, technology, and people to help you take your company to new heights!” Source: RevenueBase Database · checked Sep 28, 2026
9	Horatio	Indirect evidence	New York, United StatesHQ checked Sep 28, 2026	1,001-5,000	860 contacts →
	Indirect 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 28, 2026
10	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
11	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
12	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 28, 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 28, 2026
13	Infinity	Strong evidence	Cedar Rapids, IA, United StatesHQ checked Sep 28, 2026	501-1,000	609 contacts →
	Strong 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 28, 2026
14	Global Contact Services GCS	Indirect evidence	Salisbury, NC, United StatesHQ checked Sep 28, 2026	501-1,000	542 contacts →
	Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 28, 2026
15	Movingdneedle Pvt. LTD	Partial evidence	Sterling Heights, MI, United StatesHQ checked Sep 28, 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 28, 2026
16	Callbox INC	Indirect evidence	Encino, CA, United StatesHQ checked Sep 28, 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 28, 2026
17	Infoanalytica, INC	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	201-500	482 contacts →
	Partial evidence “InfoAnalytica is a B2B sales acceleration partner for mid-market and enterprise companies.” Source: RevenueBase Database · checked Sep 28, 2026
18	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 28, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
19	Supportzebra	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	454 contacts →
	Partial evidence “SupportZebra is a business process outsourcing company based in the Philippines, with headquarters in the Houston,TX region, that specializes in: Sales & Marketing Retention \|…” Source: RevenueBase Database · checked Sep 28, 2026
20	Alliance Pdms	Indirect evidence	Hurst, TX, United StatesHQ checked Sep 28, 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 28, 2026
21	Touchstone Communications	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 28, 2026	501-1,000	393 contacts →
	Indirect evidence “Touchstone Communications was built in 2002 on the philosophy of hiring educated, motivated talent and then providing them with the best training and management to achieve our…” Source: RevenueBase Database · checked Sep 28, 2026
22	Beyond Codes INC	Partial evidence	Simi Valley, CA, United StatesHQ checked Sep 28, 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 28, 2026
23	EBQ	Strong evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	201-500	377 contacts →
	Strong evidence “EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: RevenueBase Database · checked Sep 28, 2026
24	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	354 contacts →
	Partial evidence “For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: RevenueBase Database · checked Sep 28, 2026
25	FUNNL	Partial evidence	Philadelphia, United StatesHQ checked Sep 28, 2026	201-500	349 contacts →
	Partial evidence “FunnL was built on a revolutionary idea: B2B companies don’t need more leads-they need more qualified sales meetings with decision-makers.” 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: inside sales outsourcers. 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 inside sales outsourcers.
Partial evidence: Its own public description names part of inside sales outsourcers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name inside sales outsourcers. 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 2,373 inside sales outsourcers based in the United States

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Inside sales outsourcers based in the United States at a glance

As of Sep 28, 2026

12.8%Verified-email coverage

24.0Average contacts per company

11-50Median size (employees)

4.9%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,050

11-50

773

51-200

364

201-500

113

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,373 companies.

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 inside sales outsourcers, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “inside sales outsourcers”. 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 inside sales outsourcers), 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 inside sales outsourcers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 7,299 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.

Inside sales outsourcers by metro

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 inside sales outsourcers, 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 inside sales outsourcers are there based in the United States?

RevenueBase identified 2,373 inside sales outsourcers headquartered in the United States 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?

Advanced Call Center Technologies, LLC, headquartered in Berwyn, tops this list with the largest team on record.

Which city has the most inside sales outsourcers?

New York leads with 116 headquartered companies, followed by Sheridan (72) and Los Angeles (67).

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 7,299 verified decision-maker contacts tracked across these 2,373 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.