Company lists · Data refreshed September 2026

Top 25 Sales development outsourcing companies based in the United States

Name: Sales development outsourcing companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 2,446 companies tracked

RevenueBase identified 2,446 sales development outsourcing companies headquartered in the United States as of September 2026 and tracks 37,813 professional contacts across them, including 5,646 with verified work emails and 7,236 with mobile numbers. New York is the largest hub.

This list covers sales development outsourcing companies 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review

2,446Companies

37,813Contacts tracked

5,646Verified emails

7,236Mobile numbers

Explore all 2,446 companies → Free signup · no credit card · 500 free credits

The 25 largest sales development outsourcing companies based in the United States

Ranked by team size

Top 25 of 2,446 sales development outsourcing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names sales development outsourcing companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	MarketstarStrong evidence	Ogden, UT, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,446
	“MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: company website · checked Sep 6, 2026
2	CienceIndirect evidence	Miami, FL, United StatesHQ checked Sep 6, 2026	201-500	1,068
	“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: company website · checked Sep 6, 2026
3	MemoryblueIndirect evidence	Tysons, VA, United StatesHQ checked Sep 6, 2026	501-1,000	825
	“memoryBlue is the go-to partner for revenue leaders in B2B Tech looking to grow their pipeline engine.” Source: company website · checked Sep 6, 2026
4	SalelyticsIndirect evidence	Appleton, WI, United StatesHQ checked Sep 6, 2026	1,001-5,000	776
	“Salelytics is now MarketSource.” Source: company website · checked Sep 6, 2026
5	Abstrakt Marketing GroupIndirect evidence	St Louis, MO, United StatesHQ checked Sep 6, 2026	501-1,000	724
	“We book the qualified meetings that fill your pipeline for any B2B company ready to grow.” Source: company website · checked Sep 6, 2026
6	SalebuildIndirect evidence	Redwood City, CA, United StatesHQ checked Sep 6, 2026	n/a	708
	“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: company website · checked Sep 6, 2026
7	InfinityPartial evidence	Cedar Rapids, IA, United StatesHQ checked Sep 6, 2026	501-1,000	609
	“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: company website · checked Sep 6, 2026
8	Movingdneedle Pvt. LTDPartial evidence	Sterling Heights, MI, United StatesHQ checked Sep 6, 2026	51-200	528
	“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: company website · checked Sep 6, 2026
9	The Pipeline GroupIndirect evidence	San Jose, CA, United StatesHQ checked Sep 6, 2026	201-500	523
	“The Pipeline Group helps B2B tech companies scale pipeline fast through our SDR-as-a-Service model.” Source: company website · checked Sep 6, 2026
10	Callbox INCIndirect evidence	Encino, CA, United StatesHQ checked Sep 6, 2026	201-500	499
	“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: company website · checked Sep 6, 2026
11	Infoanalytica, INCPartial evidence	San Jose, CA, United StatesHQ checked Sep 6, 2026	201-500	482
	“InfoAnalytica is a B2B sales acceleration partner for mid-market and enterprise companies.” Source: company website · checked Sep 6, 2026
12	SaleshiveIndirect evidence	Denver, CO, United StatesHQ checked Sep 6, 2026	51-200	455
	Source: company website · checked Sep 6, 2026
13	Alliance PdmsIndirect evidence	Hurst, TX, United StatesHQ checked Sep 6, 2026	51-200	428
	“Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: company website · checked Sep 6, 2026
14	Beyond Codes INCPartial evidence	Simi Valley, CA, United StatesHQ checked Sep 6, 2026	201-500	380
	“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: company website · checked Sep 6, 2026
15	EBQPartial evidence	Austin, TX, United StatesHQ checked Sep 6, 2026	201-500	377
	“EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: company website · checked Sep 6, 2026
16	FUNNLPartial evidence	Philadelphia, United StatesHQ checked Sep 6, 2026	201-500	349
	“FunnL was built on a revolutionary idea: B2B companies don’t need more leads-they need more qualified sales meetings with decision-makers.” Source: company website · checked Sep 6, 2026
17	JumpcrewPartial evidence	Nashville, TN, United StatesHQ checked Sep 6, 2026	201-500	339
	“Launch-ready sales teams, experienced leaders, and time-tested processes to help you acquire new customers faster and with less risk than doing it alone.” Source: company website · checked Sep 6, 2026
18	CydcorIndirect evidence	Agoura Hills, CA, United StatesHQ checked Sep 6, 2026	51-200	328
	“We create opportunity: For our clients, our team, and the future.” Source: company website · checked Sep 6, 2026
19	By Appointment Only, Inc. BAOIndirect evidence	Chelmsford, MA, United StatesHQ checked Sep 6, 2026	201-500	291
	“The market knows us as the leader in appointment setting.” Source: company website · checked Sep 6, 2026
20	Rocket ConnectionsPartial evidence	Detroit, MI, United StatesHQ checked Sep 6, 2026	1,001-5,000	247
	“Rocket Connections is a sales and support platform specializing in contact center services.” Source: company website · checked Sep 6, 2026
21	Marketjoy, INCStrong evidence	Pensacola, FL, United StatesHQ checked Sep 6, 2026	51-200	223
	“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: company website · checked Sep 6, 2026
22	SqueezePartial evidence	Orem, United StatesHQ checked Sep 6, 2026	501-1,000	217
	“Squeeze (GoSqueeze.com) is the leader in Sales Experience (SX).” Source: company website · checked Sep 6, 2026
23	Growth ERAPartial evidence	Jacksonville, FL, United StatesHQ checked Sep 6, 2026	51-200	217
	“Growth Era (formerly nextsales) is a sales enablement company with a passion to empower the growth of ambitious B2B companies.” Source: company website · checked Sep 6, 2026
24	Belkins INCIndirect evidence	Dover, DE, United StatesHQ checked Sep 6, 2026	201-500	209
	“Belkins is the #1 ranked appointment-setting agency in the USA for 5 years in a row, driving results for businesses in 50+ industries across the globe.” Source: company website · checked Sep 6, 2026
25	Sales Focus INCStrong evidence	North Charleston, SC, United StatesHQ checked Sep 6, 2026	201-500	198
	“Sales Focus Inc.(SFI) pioneered the sales outsourcing industry in 1998.” Source: company website · checked Sep 6, 2026

Showing 25 of 2,446 sales development outsourcing companies based in the United States

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Sales development outsourcing companies based in the United States at a glance

As of Sep 6, 2026

1-10Median size (employees)

New YorkLargest hub · 121 HQs

7,236Contacts with mobile numbers

Sep 6, 2026Data refreshed

Companies by employee count

1-10

1,379

11-50

719

51-200

247

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

5,112

31–60

426

61–90

90–180

180+

100

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 development outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “sales development outsourcing companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among sales development outsourcing companies, 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 an evidence 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, 5,646 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 6, 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 development outsourcing companies by metro

Sales development outsourcing companies in New York121
Sales development outsourcing companies in Los Angeles66
Sales development outsourcing companies in San Francisco66
Sales development outsourcing companies in Austin60
Sales development outsourcing companies in Sheridan59
Sales development outsourcing companies in Chicago48
Sales development outsourcing companies in Miami44
Sales development outsourcing companies in Atlanta43
Sales development outsourcing companies in Dallas41
Sales development outsourcing companies in San Diego39
Sales development outsourcing companies in Houston35
Sales development outsourcing companies in Orlando30
Sales development outsourcing companies in Denver26
Sales development outsourcing companies in Boston25
Sales development outsourcing companies in Phoenix25

Frequently asked

How many sales development outsourcing companies are there based in the United States?

RevenueBase identified 2,446 sales development outsourcing companies 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?

Marketstar, headquartered in Ogden, tops this list with the largest team on record.

Which city has the most sales development outsourcing companies?

New York leads with 121 headquartered companies, followed by Los Angeles (66) and San Francisco (66).

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 5,646 verified decision-maker contacts tracked across these 2,446 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 6, 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 SmartSearch, 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.