Company lists · Data refreshed September 2026

Top 25 Professional outsourcing services based in the United States

Name: Professional outsourcing services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 2,255 companies tracked

RevenueBase identified 2,255 professional outsourcing services headquartered in the United States as of September 2026 and tracks 56,780 professional contacts across them, including 7,553 with verified work emails. New York is the largest hub.

This list covers professional outsourcing services 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 21, 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 21, 2026 86% judged on-target in blind review

2,255Companies

56,780Contacts tracked

7,553Verified emails

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The 25 largest professional outsourcing services based in the United States

Ranked by team size

Top 25 of 2,255 professional outsourcing services based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to professional 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	Advanced Call Center Technologies, LLC	Indirect evidence	Berwyn, PA, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,774 contacts →
	Indirect 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 21, 2026
2	Stream Global Services	Indirect evidence	Eagan, MN, United StatesHQ checked Sep 21, 2026	10001+	2,772 contacts →
	Indirect 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 21, 2026
3	Enshored	Indirect evidence	Signal Hill, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,247 contacts →
	Indirect evidence “Enshored powers the growth of ambitious high growth companies by delivering and managing teams of elite outsourcers.” Source: RevenueBase Database · checked Sep 21, 2026
4	Support Services Group	Indirect evidence	Waco, TX, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,710 contacts →
	Indirect evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 21, 2026
5	RDI Corporation	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,484 contacts →
	Indirect evidence “At RDI, we believe in winning smart by providing customized, strategic solutions to our clients.” Source: RevenueBase Database · checked Sep 21, 2026
6	Broadpath	Partial evidence	Tucson, AZ, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,275 contacts →
	Partial evidence “BroadPath provides transformational outsourcing and managed services powered by our one-of-a-kind, 100% remote business model.” Source: RevenueBase Database · checked Sep 21, 2026
7	SEBPO	Indirect evidence	Marlton, NJ, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,237 contacts →
	Indirect evidence “SEBPO transforms operational complexity into a seamless, strategic advantage.” Source: RevenueBase Database · checked Sep 21, 2026
8	Open Access BPO	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,021 contacts →
	Partial evidence “Open Access is a leading outsourcing solutions provider with a history of delivering high-quality services to global businesses across industries.” Source: RevenueBase Database · checked Sep 21, 2026
9	Inktel Contact Center Solutions	Indirect evidence	Doral, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	902 contacts →
	Indirect 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 21, 2026
10	Atidiv	Indirect evidence	Miami Beach, FL, United StatesHQ checked Sep 21, 2026	501-1,000	887 contacts →
	Indirect evidence “At Atidiv, we help DTC brands and media agencies scale without the overhead of building large in-house teams.” Source: RevenueBase Database · checked Sep 21, 2026
11	Horatio	Partial evidence	New York, United StatesHQ checked Sep 21, 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 21, 2026
12	Sequential Technology International	Indirect evidence	Bethlehem, United StatesHQ checked Sep 21, 2026	1,001-5,000	758 contacts →
	Indirect evidence “Sequential Tech is the trusted outsource partner of wireline/wireless telecommunication, broadband, cable/MSO, and satellite service providers.” Source: RevenueBase Database · checked Sep 21, 2026
13	Not Available	Indirect evidence	Na, United StatesHQ checked Sep 21, 2026	n/a	658 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
14	EOX Vantage	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 21, 2026	501-1,000	654 contacts →
	Indirect evidence “For over two decades, EOX Vantage has specialized in providing scalable, on-demand support to aid our partners with their current workforce challenges and ensure that their agents…” Source: RevenueBase Database · checked Sep 21, 2026
15	Global Strategic Business Process Solutions	Partial evidence	Burlington, NC, United StatesHQ checked Sep 21, 2026	1,001-5,000	553 contacts →
	Partial evidence “Global Strategic is a business process outsourcing partner that builds high-performing teams through custom onshore, nearshore, and offshore solutions.” Source: RevenueBase Database · checked Sep 21, 2026
16	Global Contact Services GCS	Indirect evidence	Salisbury, NC, United StatesHQ checked Sep 21, 2026	501-1,000	542 contacts →
	Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 21, 2026
17	Qway Technologies	Partial evidence	Princeton, NJ, United StatesHQ checked Sep 21, 2026	501-1,000	527 contacts →
	Partial evidence “QWay Technologies QWay is a global business outsourcing provider with a strong background of Revenue Cycle Management and providing customer support.” Source: RevenueBase Database · checked Sep 21, 2026
18	FGC	Partial evidence	Suffern, NY, United StatesHQ checked Sep 21, 2026	501-1,000	504 contacts →
	Partial evidence “FGC+ was founded in 2011 with the purpose of elevating the quality of outsourcing services.” Source: RevenueBase Database · checked Sep 21, 2026
19	Supportzebra	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 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 21, 2026
20	Velan Info Services	Indirect evidence	Dover, DE, United StatesHQ checked Sep 21, 2026	201-500	447 contacts →
	Indirect evidence “Velan Info Services is a leading multidisciplinary service provider with its clients across the globe.” Source: RevenueBase Database · checked Sep 21, 2026
21	The Functionary	Indirect evidence	Aubrey, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	415 contacts →
	Indirect evidence “The Functionary helps companies scale operations around the reality of their business, not a standard model.” Source: RevenueBase Database · checked Sep 21, 2026
22	Outsource Partners International Alumni	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	397 contacts →
	Strong evidence “Outsource Partners International (OPI) is a professional services firm dedicated to the outsourcing of finance, accounting, and analytics business processes.” Source: RevenueBase Database · checked Sep 21, 2026
23	FTO	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 21, 2026	1,001-5,000	348 contacts →
	Indirect evidence “FTO™ completes four types of work, namely customer engagement, data entry and acquisition, help desk and tech support, and back-office support.” Source: RevenueBase Database · checked Sep 21, 2026
24	EDS Service Solutions	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	5,001-10,000	342 contacts →
	Partial evidence “EDS service solutions is the number one outsourcing solution for Fortune 500 companies throughout the US.” Source: RevenueBase Database · checked Sep 21, 2026
25	Eplanet Global	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 21, 2026	501-1,000	329 contacts →
	Indirect evidence “About Eplanet Global Since our inception in 2003, Eplanet Global has been a trailblazer in the tech-driven BPO industry.” 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: professional 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 professional outsourcing services.
Partial evidence: Its own public description names part of professional outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name professional 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 2,255 professional outsourcing services based in the United States

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Professional outsourcing services based in the United States at a glance

As of Sep 21, 2026

13.3%Verified-email coverage

25.2Average contacts per company

11-50Median size (employees)

4.7%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,064

11-50

646

51-200

330

201-500

122

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 2,255 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 professional 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “professional 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 professional 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 professional outsourcing services, 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, 7,553 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.

Professional outsourcing services by metro

Professional outsourcing services in New York106
Professional outsourcing services in Miami56
Professional outsourcing services in Houston44
Professional outsourcing services in Austin43
Professional outsourcing services in Sheridan42
Professional outsourcing services in Dallas38
Professional outsourcing services in Los Angeles37
Professional outsourcing services in Atlanta34
Professional outsourcing services in Chicago34
Professional outsourcing services in San Diego26
Professional outsourcing services in Las Vegas25
Professional outsourcing services in San Francisco25

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 professional 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 professional outsourcing services are there based in the United States?

RevenueBase identified 2,255 professional outsourcing services 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 professional outsourcing services?

New York leads with 106 headquartered companies, followed by Miami (56) and Houston (44).

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 7,553 verified decision-maker contacts tracked across these 2,255 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.