Company lists · Data refreshed September 2026

Top 25 Outbound sdr agencies based in the United States

Name: Outbound sdr agencies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 1,925 companies tracked

RevenueBase identified 1,925 outbound sdr agencies headquartered in the United States as of September 2026 and tracks 31,399 professional contacts across them, including 4,550 with verified work emails and 5,352 with mobile numbers. New York is the largest hub.

This list covers outbound sdr agencies 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 14, 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 14, 2026 86% judged on-target in blind review

1,925Companies

31,399Contacts tracked

4,550Verified emails

5,352Mobile numbers

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The 25 largest outbound sdr agencies based in the United States

Ranked by team size

Top 25 of 1,925 outbound sdr agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to outbound sdr agencies: 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	Marketstar	Indirect evidence	Ogden, UT, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,446 contacts →
	Indirect evidence “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: RevenueBase Database · checked Sep 14, 2026
2	Memoryblue	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 14, 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 14, 2026
3	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 14, 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 14, 2026
4	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 14, 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 14, 2026
5	Flexisales INC	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 14, 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 14, 2026
6	Movingdneedle Pvt. LTD	Indirect evidence	Sterling Heights, MI, United StatesHQ checked Sep 14, 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 14, 2026
7	Callbox INC	Indirect evidence	Encino, CA, United StatesHQ checked Sep 14, 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 14, 2026
8	Infoanalytica, INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 14, 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 14, 2026
9	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
10	Alliance Pdms	Indirect evidence	Hurst, TX, United StatesHQ checked Sep 14, 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 14, 2026
11	Amarketforce	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 14, 2026	201-500	391 contacts →
	Indirect evidence “aMarketForce is a full-scale B2B Contact Database & Demand Generation services company.” Source: RevenueBase Database · checked Sep 14, 2026
12	Beyond Codes INC	Indirect evidence	Simi Valley, CA, United StatesHQ checked Sep 14, 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 14, 2026
13	EBQ	Indirect evidence	Austin, TX, United StatesHQ checked Sep 14, 2026	201-500	377 contacts →
	Indirect evidence “EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: RevenueBase Database · checked Sep 14, 2026
14	FUNNL	Indirect evidence	Philadelphia, United StatesHQ checked Sep 14, 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 14, 2026
15	Jumpcrew	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 14, 2026	201-500	339 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
16	By Appointment Only, Inc. BAO	Indirect evidence	Chelmsford, MA, United StatesHQ checked Sep 14, 2026	201-500	291 contacts →
	Indirect evidence “The market knows us as the leader in appointment setting.” Source: RevenueBase Database · checked Sep 14, 2026
17	Calltend INC	Indirect evidence	Los Angeles, TX, United StatesHQ checked Sep 14, 2026	51-200	289 contacts →
	Indirect evidence “Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: RevenueBase Database · checked Sep 14, 2026
18	Rocket Connections	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 14, 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 14, 2026
19	Marketjoy, INC	Indirect evidence	Pensacola, FL, United StatesHQ checked Sep 14, 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 14, 2026
20	Belkins INC	Indirect evidence	Dover, DE, United StatesHQ checked Sep 14, 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 14, 2026
21	Sales Focus INC	Indirect evidence	North Charleston, SC, United StatesHQ checked Sep 14, 2026	201-500	198 contacts →
	Indirect evidence “Sales Focus Inc.(SFI) pioneered the sales outsourcing industry in 1998.” Source: RevenueBase Database · checked Sep 14, 2026
22	Channelgrowth	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	201-500	194 contacts →
	Indirect evidence “ChannelGrowth provides B2B data acquisition, lead generation, prospecting, and sales teams at scale.” Source: RevenueBase Database · checked Sep 14, 2026
23	Salaria Sales Solutions	Indirect evidence	Washington D.c., WA, United StatesHQ checked Sep 14, 2026	51-200	188 contacts →
	Indirect evidence “Salaria Sales Solutions is a B2B lead generation and sales development agency.” Source: RevenueBase Database · checked Sep 14, 2026
24	Concept Services	Indirect evidence	Copley, OH, United StatesHQ checked Sep 14, 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 14, 2026
25	Signia	Indirect evidence	Westminster, CO, United StatesHQ checked Sep 14, 2026	201-500	181 contacts →
	Indirect evidence “Signia aims to provide marketing services to targeted business environments in the US.” Source: RevenueBase Database · checked Sep 14, 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: outbound sdr agencies. 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 outbound sdr agencies.
Partial evidence: Its own public description names part of outbound sdr agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outbound sdr agencies. 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 1,925 outbound sdr agencies based in the United States

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Outbound sdr agencies based in the United States at a glance

As of Sep 14, 2026

14.5%Verified-email coverage

17.0%Mobile-number coverage

16.3Average contacts per company

1-10Median size (employees)

5.6%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

1,040

11-50

593

51-200

210

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 17.0d

3,3530–30

1,09831–60

2161–90

890–180

70180+

Company record updated

Median 78.0d

00–30

10,19131–60

15,39061–90

4,34290–180

1,476180+

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 outbound sdr agencies, 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 “outbound sdr agencies”. 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 outbound sdr agencies), 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 outbound sdr agencies, 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, 4,550 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 14, 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.

Outbound sdr agencies by metro

Outbound sdr agencies in New York107
Outbound sdr agencies in Sheridan67
Outbound sdr agencies in Los Angeles60
Outbound sdr agencies in San Francisco51
Outbound sdr agencies in Austin48
Outbound sdr agencies in Miami45
Outbound sdr agencies in Dallas35
Outbound sdr agencies in Chicago34
Outbound sdr agencies in San Diego30
Outbound sdr agencies in Atlanta29
Outbound sdr agencies in Houston26

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 outbound sdr agencies, 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 outbound sdr agencies are there based in the United States?

RevenueBase identified 1,925 outbound sdr agencies 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 outbound sdr agencies?

New York leads with 107 headquartered companies, followed by Sheridan (67) and Los Angeles (60).

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 4,550 verified decision-maker contacts tracked across these 1,925 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 14, 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.