Company lists · Data refreshed September 2026

Top 25 Human resources outsourcing firms worldwide

Name: Human resources outsourcing firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 40,569 companies tracked

RevenueBase identified 40,569 human resources outsourcing firms worldwide as of September 2026 and tracks 664,217 professional contacts across them, including 120,656 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers human resources outsourcing firms worldwide, 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. Country and city lists for human resources outsourcing firms follow the table.

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

40,569Companies

664,217Contacts tracked

120,656Verified emails

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The 25 largest human resources outsourcing firms worldwide

Ranked by team size

Top 25 of 40,569 human resources outsourcing firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to human resources outsourcing 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	ADP	Indirect evidence	Roseland, NJ, United StatesHQ checked Sep 28, 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 28, 2026
2	Paychex	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 28, 2026	10001+	17,911 contacts →
	Indirect 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 28, 2026
3	LHH	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 28, 2026	10001+	12,889 contacts →
	Indirect evidence “At LHH, we believe work should be meaningful, fulfilling, and connected.” Source: RevenueBase Database · checked Sep 28, 2026
4	Randstad USA	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	8,522 contacts →
	Indirect evidence “Randstad North America, Inc.” Source: RevenueBase Database · checked Sep 28, 2026
5	Insperity	Indirect evidence	Kingwood, TX, United StatesHQ checked Sep 28, 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 28, 2026
6	Trinet	Indirect evidence	Dublin, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,056 contacts →
	Indirect evidence “TriNet (NYSE: TNET) provides small and medium-size businesses (SMBs) with full-service HR solutions tailored by industry.” Source: RevenueBase Database · checked Sep 28, 2026
7	PSG Global Solutions	Indirect evidence	Marina Del Rey, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,000 contacts →
	Indirect evidence “PSG is a global leader in recruitment process optimization, delivering high-performance outsourced recruiting solutions that drive real business results.” Source: RevenueBase Database · checked Sep 28, 2026
8	GUSTO	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 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 28, 2026
9	Randstad India	Indirect evidence	Chennai, IndiaHQ checked Sep 28, 2026	1,001-5,000	3,145 contacts →
	Indirect evidence “Randstad is the world’s largest talent company and a partner of choice to clients.” Source: RevenueBase Database · checked Sep 28, 2026
10	Randstad España	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	1,001-5,000	3,083 contacts →
	Indirect evidence “Randstad es la empresa líder en España en soluciones de Recursos Humanos, haciendo posible que cada día personas en nuestro país tengan un empleo.” Source: RevenueBase Database · checked Sep 28, 2026
11	Allegis Global Solutions	Partial evidence	Hanover, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,866 contacts →
	Partial evidence “At Allegis Global Solutions (AGS), we’re in the human enterprise business.” Source: RevenueBase Database · checked Sep 28, 2026
12	NGA Human Resources, An Alight Company	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	2,734 contacts →
	Strong evidence “At Alight \| NGA Human Resources our mission is to make HR work better.” Source: RevenueBase Database · checked Sep 28, 2026
13	SD Worx	Indirect evidence	Antwerp, BelgiumHQ checked Sep 28, 2026	5,001-10,000	2,561 contacts →
	Indirect evidence “SD Worx is your HR, Pay and Time partner in Europe.” Source: RevenueBase Database · checked Sep 28, 2026
14	HR Path	Strong evidence	Paris La Défense, GermanyHQ checked Sep 28, 2026	1,001-5,000	2,324 contacts →
	Strong evidence “HR Path, an expert, and a major player in Human Resources, helps companies for who the human experience is essential to their digital transformation.” Source: RevenueBase Database · checked Sep 28, 2026
15	PT Danamas Insan Kreasi Andalan Dika	Partial evidence	Jakarta Pusat, IndonesiaHQ checked Sep 28, 2026	1,001-5,000	2,036 contacts →
	Partial evidence “PT Danamas Insan Kreasi Andalan (DIKA) adalah solusi outsourcing terpercaya untuk membantu bisnis Anda tumbuh lebih cepat dan efisien.” Source: RevenueBase Database · checked Sep 28, 2026
16	Sopra HR Software	Indirect evidence	Courbevoie, FranceHQ checked Sep 28, 2026	1,001-5,000	1,855 contacts →
	Indirect evidence “Sopra HR Software, leader en solutions et services pour la paie et les RH, répond aux enjeux des Directions des Ressources Humaines des organisations de moyennes et grandes…” Source: RevenueBase Database · checked Sep 28, 2026
17	Ciel HR	Strong evidence	Bengaluru, IndiaHQ checked Sep 28, 2026	501-1,000	1,809 contacts →
	Strong evidence “CIEL HR is the only company in India which provides a comprehensive suite of technology-driven human resources solutions across the entire human resource chain and impacts every…” Source: RevenueBase Database · checked Sep 28, 2026
18	Synergie Italia	Indirect evidence	Torino, ItalyHQ checked Sep 28, 2026	501-1,000	1,748 contacts →
	Indirect evidence “L’Italia è piena di talenti: il nostro lavoro è riconoscerli!” Synergie Italia S.p.A.” Source: RevenueBase Database · checked Sep 28, 2026
19	GI Group Holding	Indirect evidence	Milan, ItalyHQ checked Sep 28, 2026	5,001-10,000	1,717 contacts →
	Indirect evidence “Gi Group Holding is a global ecosystem of integrated HR Services that aims at evolving the Labour Market by creating sustainable, social and economical value, emphasising the…” Source: RevenueBase Database · checked Sep 28, 2026
20	Global Empregos Ltda	Indirect evidence	Santo André, BrazilHQ checked Sep 28, 2026	n/a	1,695 contacts →
	Indirect evidence “Durante os anos 80, o mundo testemunhou o surgimento de uma nova ordem.” Source: RevenueBase Database · checked Sep 28, 2026
21	Fesco Adecco (外企德科)	Strong evidence	上海, ChinaHQ checked Sep 28, 2026	1,001-5,000	1,687 contacts →
	Strong evidence “FESCO Adecco is a joint-venture human resources services company combining the strengths of FESCO Group (a China 500 Company and the first Chinese company in the human resources…” Source: RevenueBase Database · checked Sep 28, 2026
22	51job	Strong evidence	Pudong District, ChinaHQ checked Sep 28, 2026	5,001-10,000	1,675 contacts →
	Strong evidence “51job (Nasdaq:JOBS) is a leading human resource solutions provider in China, offering a broad array of services in the areas of recruitment solutions, training and assessment, and…” Source: RevenueBase Database · checked Sep 28, 2026
23	Eurofirms Group People First	Indirect evidence	Cassá De La Selva, SpainHQ checked Sep 28, 2026	1,001-5,000	1,545 contacts →
	Indirect evidence “Eurofirms Group is Spain's first talent management multinational.” Source: RevenueBase Database · checked Sep 28, 2026
24	Activos Chile	Indirect evidence	Las Condes, ChileHQ checked Sep 28, 2026	5,001-10,000	1,504 contacts →
	Indirect evidence “Somos una empresa especializada en entregar servicios integrados en el sector de recursos humanos comprometida con los procesos y necesidades de cada uno de nuestros clientes.” Source: RevenueBase Database · checked Sep 28, 2026
25	Zellis	Indirect evidence	Bristol, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,465 contacts →
	Indirect evidence “Zellis helps organisations unlock better outcomes by creating exceptional experiences for their people.” 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: human resources outsourcing 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 human resources outsourcing firms.
Partial evidence: Its own public description names part of human resources outsourcing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name human resources outsourcing 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 40,569 human resources outsourcing firms worldwide

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Human resources outsourcing firms worldwide at a glance

As of Sep 28, 2026

18.2%Verified-email coverage

16.4Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · Sao Paulo

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

24,812

11-50

9,625

51-200

3,287

201-500

1,236

501-1,000

614

1,001-5,000

631

5,001-10,000

148

10001+

142

Email recency is reported on each country list linked below.

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 human resources outsourcing 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.
Coverage: Every country. Country and city lists for human resources outsourcing firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “human resources outsourcing 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 human resources outsourcing 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 human resources outsourcing firms, and records with no verified work email.
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, 120,656 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.

Human resources outsourcing firms by location

174 lists · largest first

Every Human resources outsourcing firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 human resources outsourcing 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 human resources outsourcing firms are there worldwide?

RevenueBase identified 40,569 human resources outsourcing firms worldwide 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 country has the most human resources outsourcing firms?

The United States leads with 5,599 companies, followed by India (5,148) and Brazil (2,662). Every human resources outsourcing firms list by country and city is linked on this page.

Which city has the most human resources outsourcing firms?

Sao Paulo leads with 603 headquartered companies, followed by Mumbai (470) and London (371).

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 120,656 verified decision-maker contacts tracked across these 40,569 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.