Company lists · Data refreshed September 2026

Top 25 HR software professional services based in the United States

Name: HR software professional services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 26, 2026 6,520 companies tracked

RevenueBase identified 6,520 HR software professional services headquartered in the United States as of September 2026 and tracks 297,476 professional contacts across them, including 110,434 with verified work emails and 91,965 with mobile numbers. New York is the largest hub.

This list covers HR software professional services 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 26, 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 26, 2026 86% judged on-target in blind review

6,520Companies

297,476Contacts tracked

110,434Verified emails

91,965Mobile numbers

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The 25 largest HR software professional services based in the United States

Ranked by team size

Top 25 of 6,520 HR software professional services based in the United States, ranked by team size, largest first. Data refreshed Sep 26, 2026. RevenueBase Smart Search rates how each company's information relates to HR software professional services: 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 26, 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 26, 2026
2	Workday	Partial evidence	Pleasanton, CA, United StatesHQ checked Sep 26, 2026	10001+	20,846 contacts →
	Partial evidence “By unifying HR and Finance on an open, trusted platform powered by AI, Workday delivers high-impact outcomes our customers can count on.” Source: RevenueBase Database · checked Sep 26, 2026
3	Paychex	Partial evidence	Rochester, NY, United StatesHQ checked Sep 26, 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 26, 2026
4	LHH	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 26, 2026	10001+	12,889 contacts →
	Indirect evidence “At LHH, we believe work should be meaningful, fulfilling, and connected.” Source: RevenueBase Database · checked Sep 26, 2026
5	Randstad USA	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 26, 2026	1,001-5,000	8,522 contacts →
	Indirect evidence “Randstad North America, Inc.” Source: RevenueBase Database · checked Sep 26, 2026
6	Paycom	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 26, 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 26, 2026
7	DEEL	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 26, 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 26, 2026
8	Rippling	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 26, 2026	1,001-5,000	6,303 contacts →
	Indirect evidence “Rippling is a workforce management system that eliminates the friction from running a business.” Source: RevenueBase Database · checked Sep 26, 2026
9	Paylocity	Strong evidence	Schaumburg, IL, United StatesHQ checked Sep 26, 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 26, 2026
10	Dayforce	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 26, 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 26, 2026
11	Strada	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 26, 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 26, 2026
12	Insperity	Indirect evidence	Kingwood, TX, United StatesHQ checked Sep 26, 2026	1,001-5,000	4,761 contacts →
	Indirect evidence “Since 1986, Insperity’s mission has been to help businesses succeed so communities prosper.” Source: RevenueBase Database · checked Sep 26, 2026
13	Trinet	Partial evidence	Dublin, CA, United StatesHQ checked Sep 26, 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 26, 2026
14	GUSTO	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 26, 2026	1,001-5,000	3,543 contacts →
	Indirect evidence “Gusto has been growing the small business economy for 15+ years.” Source: RevenueBase Database · checked Sep 26, 2026
15	Allegis Global Solutions	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 26, 2026	1,001-5,000	2,866 contacts →
	Indirect evidence “At Allegis Global Solutions (AGS), we’re in the human enterprise business.” Source: RevenueBase Database · checked Sep 26, 2026
16	Paycor	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 26, 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 26, 2026
17	SAP Successfactors	Indirect evidence	South San Francisco, CA, United StatesHQ checked Sep 26, 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 26, 2026
18	Remedy Intelligent Staffing	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 26, 2026	10001+	1,948 contacts →
	Partial evidence “Remedy Intelligent Staffing is a nationwide professional staffing organization with more than 50 years of recruiting and selection expertise to match job candidates with positions…” Source: RevenueBase Database · checked Sep 26, 2026
19	Kronos Incorporated	Partial evidence	Lowell, MA, United StatesHQ checked Sep 26, 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 26, 2026
20	Bamboohr	Indirect evidence	Draper, UT, United StatesHQ checked Sep 26, 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 26, 2026
21	HIBOB	Partial evidence	New York, NY, United StatesHQ checked Sep 26, 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 26, 2026
22	Isolved	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 26, 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 26, 2026
23	Avature	Indirect evidence	New York, NY, United StatesHQ checked Sep 26, 2026	1,001-5,000	1,535 contacts →
	Indirect evidence “Pioneer of CRM technology for recruiting, Avature is a highly configurable enterprise SaaS platform for talent acquisition and talent management that drives innovation in the HCM…” Source: RevenueBase Database · checked Sep 26, 2026
24	Darwinbox	Partial evidence	San Mateo, CA, United StatesHQ checked Sep 26, 2026	1,001-5,000	1,504 contacts →
	Partial evidence “Darwinbox is a new-age, agile HCM Suite that enables enterprises and growing businesses to automate their day-to-day HR processes, deliver actionable insights and build better…” Source: RevenueBase Database · checked Sep 26, 2026
25	SSS	Partial evidence	Littleton, CO, United StatesHQ checked Sep 26, 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 26, 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: HR software professional services. 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 HR software professional services.
Partial evidence: Its own public description names part of HR software professional services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name HR software professional services. 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 6,520 HR software professional services based in the United States

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HR software professional services based in the United States at a glance

As of Sep 26, 2026

37.1%Verified-email coverage

30.9%Mobile-number coverage

45.6Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · New York

Sep 26, 2026Page data refreshed

Companies by employee count

1-10

4,542

11-50

1,251

51-200

440

201-500

119

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

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

Email last verified

Median 28.0d

72,2230–30

34,00031–60

2,72661–90

16790–180

1,318180+

Company record updated

Median 88.0d

00–30

71,83531–60

116,72461–90

88,83490–180

20,083180+

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 HR software professional services, 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 “HR software professional services”. 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 HR software professional services), 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 HR software professional services, 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, 110,434 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 26, 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.

HR software professional services 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 HR software professional services, 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 HR software professional services are there based in the United States?

RevenueBase identified 6,520 HR software professional services 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 HR software professional services?

New York leads with 233 headquartered companies, followed by Atlanta (175) and Houston (114).

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 110,434 verified decision-maker contacts tracked across these 6,520 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 26, 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.