Company lists · Data refreshed September 2026

Top 25 Core HR software companies based in the United States

Name: Core HR software 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 14, 2026 699 companies tracked

RevenueBase identified 699 core HR software companies headquartered in the United States as of September 2026 and tracks 173,433 professional contacts across them, including 64,795 with verified work emails. Atlanta is the largest hub.

This list covers core HR software 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 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

699Companies

173,433Contacts tracked

64,795Verified emails

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The 25 largest core HR software companies based in the United States

Ranked by team size

Top 25 of 699 core HR software companies 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 core HR software 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	ADP	Indirect evidence	Roseland, NJ, United StatesHQ checked Sep 14, 2026	10001+	84,166 contacts →
	Indirect evidence “Designing better ways to work through cutting-edge products, premium services and exceptional experiences that enable people to reach their full potential.” Source: RevenueBase Database · checked Sep 14, 2026
2	Paychex	Partial evidence	Rochester, NY, United StatesHQ checked Sep 14, 2026	10001+	17,911 contacts →
	Partial evidence “As the future of work continues to evolve, Paychex leads the way by making complex HR, payroll, and benefits brilliantly simple.” Source: RevenueBase Database · checked Sep 14, 2026
3	Paycom	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 14, 2026	5,001-10,000	7,002 contacts →
	Strong evidence “Paycom (NYSE:PAYC) automates the entire employee life cycle in a truly single HR and payroll software.” Source: RevenueBase Database · checked Sep 14, 2026
4	DEEL	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 14, 2026	5,001-10,000	6,510 contacts →
	Partial evidence “Deel is one platform for payroll, HR, benefits, mobility, performance, and device management across 150+ countries.” Source: RevenueBase Database · checked Sep 14, 2026
5	Paylocity	Strong evidence	Schaumburg, IL, United StatesHQ checked Sep 14, 2026	5,001-10,000	6,153 contacts →
	Strong evidence “Paylocity (NASDAQ: PCTY) is an award-winning provider of cloud-based HR, payroll and spend management software solutions.” Source: RevenueBase Database · checked Sep 14, 2026
6	Dayforce	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 14, 2026	5,001-10,000	5,902 contacts →
	Indirect evidence “Dayforce is as a global leader in HCM technology focused on improving work for thousands of customers and millions of employees around the world.” Source: RevenueBase Database · checked Sep 14, 2026
7	Strada	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 14, 2026	5,001-10,000	5,585 contacts →
	Indirect evidence “With over 30 years as a global people, payroll, and technology leader, Strada specializes in removing complexity to simplify workforce management.” Source: RevenueBase Database · checked Sep 14, 2026
8	Trinet	Partial evidence	Dublin, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	4,056 contacts →
	Partial evidence “TriNet (NYSE: TNET) provides small and medium-size businesses (SMBs) with full-service HR solutions tailored by industry.” Source: RevenueBase Database · checked Sep 14, 2026
9	Paycor	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,615 contacts →
	Partial evidence “Paycor’s HR, payroll, and talent platform connects leaders to people, data, and expertise.” Source: RevenueBase Database · checked Sep 14, 2026
10	SAP Successfactors	Indirect evidence	South San Francisco, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,948 contacts →
	Indirect evidence “SAP SuccessFactors is SAP’s cloud human capital management (HCM) suite built for Autonomous HCM-powered by AI and guided by people.” Source: RevenueBase Database · checked Sep 14, 2026
11	Kronos Incorporated	Partial evidence	Lowell, MA, United StatesHQ checked Sep 14, 2026	5,001-10,000	1,889 contacts →
	Partial evidence “Built from the merger of Ultimate Software & Kronos Inc, we are now UKG.” Source: RevenueBase Database · checked Sep 14, 2026
12	Bamboohr	Indirect evidence	Draper, UT, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,812 contacts →
	Indirect evidence “For 16 years, BambooHR has embarked on a mission to help organizations and their employees build better workplaces and achieve their unique missions.” Source: RevenueBase Database · checked Sep 14, 2026
13	HIBOB	Partial evidence	New York, NY, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,669 contacts →
	Partial evidence “HiBob is on a mission to transform how organizations operate in the modern world of work with its HR platform,"Bob." Leading the way for the future workplace, Bob offers…” Source: RevenueBase Database · checked Sep 14, 2026
14	Isolved	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,657 contacts →
	Indirect evidence “isolved® isolved is a Workforce Capital Management company, the next evolution of HCM, where human workers and AI agents are governed together on a single system of record, with…” Source: RevenueBase Database · checked Sep 14, 2026
15	SSS	Partial evidence	Littleton, CO, United StatesHQ checked Sep 14, 2026	n/a	1,376 contacts →
	Partial evidence “Employee Based Systems (EBS) is a innovative HRMS software development, implementation training, support, and services company specializing in helping companies improve…” Source: RevenueBase Database · checked Sep 14, 2026
16	Keka HR	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	501-1,000	1,182 contacts →
	Partial evidence “Keka is a leading unified HR and payroll platform that helps organizations run people operations with consistency, compliance, and operational clarity.” Source: RevenueBase Database · checked Sep 14, 2026
17	Ultimate Software	Partial evidence	Weston, FL, United StatesHQ checked Sep 14, 2026	5,001-10,000	1,084 contacts →
	Partial evidence “Built from the merger of Ultimate Software & Kronos Inc, we are now UKG.” Source: RevenueBase Database · checked Sep 14, 2026
18	Coadvantage	Indirect evidence	Bradenton, FL, United StatesHQ checked Sep 14, 2026	201-500	586 contacts →
	Indirect evidence “CoAdvantage is now CoAd.” Source: RevenueBase Database · checked Sep 14, 2026
19	Electronic Commerce, Inc. Eci, INC	Indirect evidence	Elkhart, IN, United StatesHQ checked Sep 14, 2026	201-500	583 contacts →
	Indirect evidence “As a leading HCM technology and services provider, Vibe HCM Inc.” Source: RevenueBase Database · checked Sep 14, 2026
20	Group Management Services, INC	Partial evidence	Richfield, OH, United StatesHQ checked Sep 14, 2026	501-1,000	535 contacts →
	Partial evidence “We provide comprehensive HR solutions to companies of all sizes throughout the United States.” Source: RevenueBase Database · checked Sep 14, 2026
21	Prismhr	Strong evidence	Chandler, AZ, United StatesHQ checked Sep 14, 2026	201-500	436 contacts →
	Strong evidence “PrismHR creates exceptional software and services, empowering human resource outsourcing service providers such as Professional Employer Organizations (PEOs) and HR outsourcers to…” Source: RevenueBase Database · checked Sep 14, 2026
22	Netchex	Partial evidence	Covington, LA, United StatesHQ checked Sep 14, 2026	201-500	376 contacts →
	Partial evidence “HR and payroll shouldn't slow you down.” Source: RevenueBase Database · checked Sep 14, 2026
23	BASIC	Partial evidence	Monona, WI, United StatesHQ checked Sep 14, 2026	51-200	324 contacts →
	Partial evidence “BASIC's integrated HR solutions come full-circle for employers nationwide.” Source: RevenueBase Database · checked Sep 14, 2026
24	Proliant	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 14, 2026	201-500	320 contacts →
	Partial evidence “ProLiant provides a fully integrated, cloud-based human capital management solution that simplifies payroll and HR processes, improves accuracy, and ensures industry compliance.” Source: RevenueBase Database · checked Sep 14, 2026
25	Experian Employer Services	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 14, 2026	501-1,000	291 contacts →
	Indirect evidence “Employers need a partner they can rely on to face today’s new challenges.” 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: core HR software 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 core HR software companies.
Partial evidence: Its own public description names part of core HR software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name core HR software 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 699 core HR software companies based in the United States

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Core HR software companies based in the United States at a glance

As of Sep 14, 2026

37.4%Verified-email coverage

248.1Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Atlanta

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

227

11-50

274

51-200

123

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 699 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 core HR software 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 “core HR software 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 core HR software 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 core HR software 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, 64,795 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.

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 core HR software 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 core HR software companies are there based in the United States?

RevenueBase identified 699 core HR software 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?

ADP, headquartered in Roseland, tops this list with the largest team on record.

Which city has the most core HR software companies?

Atlanta leads with 11 headquartered companies, followed by Houston (10) and New York (9).

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 64,795 verified decision-maker contacts tracked across these 699 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.