Company lists · Data refreshed September 2026

Top 25 Inside sales consulting companies based in the United States

Name: Inside sales consulting 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 28, 2026 4,423 companies tracked

RevenueBase identified 4,423 inside sales consulting companies headquartered in the United States as of September 2026 and tracks 37,569 professional contacts across them, including 7,014 with verified work emails. New York is the largest hub.

This list covers inside sales consulting 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, 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

4,423Companies

37,569Contacts tracked

7,014Verified emails

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The 25 largest inside sales consulting companies based in the United States

Ranked by team size

Top 25 of 4,423 inside sales consulting companies 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 consulting companies: 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	Marketsource INC	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,063 contacts →
	Partial evidence “MarketSource, an Allegis Group company, is a sales acceleration company focused on delivering better outcomes for many of the world’s most iconic brands.” Source: RevenueBase Database · checked Sep 28, 2026
2	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
3	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
4	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
5	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 28, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
6	Simplus	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 28, 2026	501-1,000	374 contacts →
	Indirect evidence “We will meet clients where they are on their Salesforce journey, accelerating time to value through our advisory-led, industry-focused, and partner-aligned approach to…” Source: RevenueBase Database · checked Sep 28, 2026
7	Miller Heiman Group, A Korn Ferry Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	501-1,000	371 contacts →
	Indirect evidence “Miller Heiman Group is now part of Korn Ferry.” Source: RevenueBase Database · checked Sep 28, 2026
8	Jumpcrew	Partial evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	201-500	339 contacts →
	Partial 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 28, 2026
9	Calltend INC	Indirect evidence	Los Angeles, TX, United StatesHQ checked Sep 28, 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 28, 2026
10	Sales Xceleration	Partial evidence	Fishers, IN, United StatesHQ checked Sep 28, 2026	51-200	268 contacts →
	Partial evidence “At Sales Xceleration, we help businesses accelerate revenue growth through our Certified Sales Operating Management System™ and the guidance of our Fractional Sales Leaders.” Source: RevenueBase Database · checked Sep 28, 2026
11	Expertcallers	Partial evidence	Princeton, NJ, United StatesHQ checked Sep 28, 2026	501-1,000	264 contacts →
	Partial evidence “ExpertCallers (a division of Flatworld Solutions) is a global consulting and outsourcing company, with a wealth of experience in providing operational and strategic excellence to…” Source: RevenueBase Database · checked Sep 28, 2026
12	Rocket Connections	Partial evidence	Detroit, MI, United StatesHQ checked Sep 28, 2026	1,001-5,000	247 contacts →
	Partial evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: RevenueBase Database · checked Sep 28, 2026
13	Corporate Visions	Partial evidence	Mesa, AZ, United StatesHQ checked Sep 28, 2026	51-200	239 contacts →
	Partial evidence “Corporate Visions is the leading provider of evidence-based sales training, messaging, and revenue enablement solutions for B2B companies around the globe.” Source: RevenueBase Database · checked Sep 28, 2026
14	Marketjoy, INC	Partial evidence	Pensacola, FL, United StatesHQ checked Sep 28, 2026	51-200	223 contacts →
	Partial 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 28, 2026
15	Squeeze	Partial evidence	Orem, United StatesHQ checked Sep 28, 2026	501-1,000	217 contacts →
	Partial evidence “Squeeze (GoSqueeze.com) is the leader in Sales Experience (SX).” Source: RevenueBase Database · checked Sep 28, 2026
16	Growth ERA	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 28, 2026	51-200	217 contacts →
	Partial evidence “Growth Era (formerly nextsales) is a sales enablement company with a passion to empower the growth of ambitious B2B companies.” Source: RevenueBase Database · checked Sep 28, 2026
17	Southwestern Consulting	Strong evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	51-200	212 contacts →
	Strong evidence “At Southwestern Consulting, we elevate the practice and perception of sales.” Source: RevenueBase Database · checked Sep 28, 2026
18	Sales Focus INC	Partial evidence	North Charleston, SC, United StatesHQ checked Sep 28, 2026	201-500	198 contacts →
	Partial evidence “Sales Focus Inc.(SFI) pioneered the sales outsourcing industry in 1998.” Source: RevenueBase Database · checked Sep 28, 2026
19	Redcloud Consulting	Partial evidence	Bellevue, WA, United StatesHQ checked Sep 28, 2026	201-500	188 contacts →
	Partial evidence “RedCloud is a business and technology consulting firm providing local companies with expert-level support for over two decades.” Source: RevenueBase Database · checked Sep 28, 2026
20	Salaria Sales Solutions	Partial evidence	Washington D.c., WA, United StatesHQ checked Sep 28, 2026	51-200	188 contacts →
	Partial evidence “Salaria Sales Solutions is a B2B lead generation and sales development agency.” Source: RevenueBase Database · checked Sep 28, 2026
21	Concept Services	Partial evidence	Copley, OH, United StatesHQ checked Sep 28, 2026	51-200	185 contacts →
	Partial evidence “Concept develops and implements comprehensive B2B lead generation and sales development solutions for companies.” Source: RevenueBase Database · checked Sep 28, 2026
22	Reveneer	Strong evidence	Burlington, MA, United StatesHQ checked Sep 28, 2026	201-500	177 contacts →
	Strong 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 28, 2026
23	Alleyoop	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 28, 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 28, 2026
24	Zaphyre	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	167 contacts →
	Partial evidence “Zaphyre is a U.S-based Execution Service Partner (ESP) specializing in Sales Lead Generation, outbound pipeline development, AI Signal Engine systems, and embedded growth…” Source: RevenueBase Database · checked Sep 28, 2026
25	Chameleon Group, LLC	Partial evidence	Dover, NH, United StatesHQ checked Sep 28, 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 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 consulting companies. 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 consulting companies.
Partial evidence: Its own public description names part of inside sales consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name inside sales consulting companies. 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 4,423 inside sales consulting companies based in the United States

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Inside sales consulting companies based in the United States at a glance

As of Sep 28, 2026

18.7%Verified-email coverage

8.5Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

3,282

11-50

874

51-200

193

201-500

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 4,423 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 consulting companies, 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 consulting companies”. 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 consulting companies), 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 consulting 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 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, 7,014 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 consulting companies 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 consulting companies, 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 consulting companies are there based in the United States?

RevenueBase identified 4,423 inside sales consulting 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?

Marketsource INC, headquartered in Alpharetta, tops this list with the largest team on record.

Which city has the most inside sales consulting companies?

New York leads with 154 headquartered companies, followed by Austin (103) and Chicago (101).

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 7,014 verified decision-maker contacts tracked across these 4,423 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.