Company lists · Data refreshed September 2026

Top 25 Outsourced sdr firms based in the United States

Name: Outsourced sdr firms 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 1,235 companies tracked

RevenueBase identified 1,235 outsourced sdr firms headquartered in the United States as of September 2026 and tracks 19,183 professional contacts across them, including 3,000 with verified work emails. New York is the largest hub.

This list covers outsourced sdr firms 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

1,235Companies

19,183Contacts tracked

3,000Verified emails

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The 25 largest outsourced sdr firms based in the United States

Ranked by team size

Top 25 of 1,235 outsourced sdr firms 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 outsourced sdr firms: 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	Memoryblue	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 21, 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 21, 2026
2	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 21, 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 21, 2026
3	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
4	Movingdneedle Pvt. LTD	Indirect evidence	Sterling Heights, MI, United StatesHQ checked Sep 21, 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 21, 2026
5	The Pipeline Group	Partial evidence	San Jose, CA, United StatesHQ checked Sep 21, 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 21, 2026
6	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 21, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
7	Alliance Pdms	Indirect evidence	Hurst, TX, United StatesHQ checked Sep 21, 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 21, 2026
8	Beyond Codes INC	Indirect evidence	Simi Valley, CA, United StatesHQ checked Sep 21, 2026	201-500	380 contacts →
	Indirect 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
9	EBQ	Partial evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	201-500	377 contacts →
	Partial evidence “EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: RevenueBase Database · checked Sep 21, 2026
10	FUNNL	Indirect evidence	Philadelphia, United StatesHQ checked Sep 21, 2026	201-500	349 contacts →
	Indirect 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 21, 2026
11	By Appointment Only, Inc. BAO	Indirect evidence	Chelmsford, MA, United StatesHQ checked Sep 21, 2026	201-500	291 contacts →
	Indirect evidence “The market knows us as the leader in appointment setting.” Source: RevenueBase Database · checked Sep 21, 2026
12	Rocket Connections	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 21, 2026	1,001-5,000	247 contacts →
	Indirect evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: RevenueBase Database · checked Sep 21, 2026
13	Marketjoy, INC	Indirect evidence	Pensacola, FL, United StatesHQ checked Sep 21, 2026	51-200	223 contacts →
	Indirect 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	Squeeze	Indirect evidence	Orem, United StatesHQ checked Sep 21, 2026	501-1,000	217 contacts →
	Indirect evidence “Squeeze (GoSqueeze.com) is the leader in Sales Experience (SX).” Source: RevenueBase Database · checked Sep 21, 2026
15	Belkins INC	Indirect evidence	Dover, DE, United StatesHQ checked Sep 21, 2026	201-500	209 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
16	Sales Focus INC	Partial evidence	North Charleston, SC, United StatesHQ checked Sep 21, 2026	201-500	198 contacts →
	Partial evidence “Sales Focus Inc.(SFI) pioneered the sales outsourcing industry in 1998.” Source: RevenueBase Database · checked Sep 21, 2026
17	Dynamic BDC	Indirect evidence	Troy, MI, United StatesHQ checked Sep 21, 2026	501-1,000	190 contacts →
	Indirect 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	Salaria Sales Solutions	Indirect evidence	Washington D.c., WA, United StatesHQ checked Sep 21, 2026	51-200	188 contacts →
	Indirect evidence “Salaria Sales Solutions is a B2B lead generation and sales development agency.” Source: RevenueBase Database · checked Sep 21, 2026
19	Concept Services	Indirect evidence	Copley, OH, United StatesHQ checked Sep 21, 2026	51-200	185 contacts →
	Indirect evidence “Concept develops and implements comprehensive B2B lead generation and sales development solutions for companies.” Source: RevenueBase Database · checked Sep 21, 2026
20	Reveneer	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 21, 2026	201-500	177 contacts →
	Indirect evidence “Reveneer has a proven, precisely engineered process for exceptional inside sales results-and we're passionate about using it to solve our customers' sales challenges.” Source: RevenueBase Database · checked Sep 21, 2026
21	Alleyoop	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 21, 2026	51-200	175 contacts →
	Indirect evidence “We help companies maximize ROI through lead generation, relationship management, and event support.” Source: RevenueBase Database · checked Sep 21, 2026
22	Demandzen	Partial evidence	Remote, United StatesHQ checked Sep 21, 2026	51-200	174 contacts →
	Partial evidence “We provide outsourced demand generation for companies looking to aggressively expand their revenue opportunities.” Source: RevenueBase Database · checked Sep 21, 2026
23	Chameleon Group, LLC	Partial evidence	Dover, NH, United StatesHQ checked Sep 21, 2026	n/a	163 contacts →
	Partial evidence “Chameleon Group is a leading provider of outsourced business development and sales services, delivering customizable business-to-business, channel, call center and direct sales…” Source: RevenueBase Database · checked Sep 21, 2026
24	Boom Demand	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 21, 2026	1,001-5,000	124 contacts →
	Indirect 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
25	Scalemill	Indirect evidence	Sheridan, WY, United StatesHQ checked Sep 21, 2026	51-200	118 contacts →
	Indirect evidence “Scalemill helps B2B SaaS companies start the right conversations with the right people.” 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 sdr firms. 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 sdr firms.
Partial evidence: Its own public description names part of outsourced sdr firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsourced sdr firms. 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 1,235 outsourced sdr firms based in the United States

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Outsourced sdr firms based in the United States at a glance

As of Sep 21, 2026

15.6%Verified-email coverage

15.5Average contacts per company

11-50Median size (employees)

4.6%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

613

11-50

410

51-200

153

201-500

501-1,000

1,001-5,000

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 1,235 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 outsourced sdr firms, 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 “outsourced sdr firms”. 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 sdr firms), 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 sdr firms, 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, 3,000 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 sdr firms 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 outsourced sdr firms, 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 sdr firms are there based in the United States?

RevenueBase identified 1,235 outsourced sdr firms 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?

Memoryblue, headquartered in Tysons, tops this list with the largest team on record.

Which city has the most outsourced sdr firms?

New York leads with 57 headquartered companies, followed by Los Angeles (42) and Sheridan (38).

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 3,000 verified decision-maker contacts tracked across these 1,235 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.