Company lists · Data refreshed September 2026

Top 25 Project staffing services worldwide

Name: Project staffing services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 29,458 companies tracked

RevenueBase identified 29,458 project staffing services worldwide as of September 2026 and tracks 1,064,867 professional contacts across them, including 148,212 with verified work emails. The United States is the largest market and London the largest hub.

This list covers project staffing services 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 29, 2026. Country and city lists for project staffing services 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 29, 2026 86% judged on-target in blind review

29,458Companies

1,064,867Contacts tracked

148,212Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest project staffing services worldwide

Ranked by team size

Top 25 of 29,458 project staffing services worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to project staffing 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	Adecco	Indirect evidence	Zurich, SwitzerlandHQ checked Sep 29, 2026	10001+	141,230 contacts →
	Indirect evidence “Perfect placements.” Source: RevenueBase Database · checked Sep 29, 2026
2	Randstad	Indirect evidence	Diemen, NetherlandsHQ checked Sep 29, 2026	10001+	30,074 contacts →
	Indirect evidence “Randstad is the world’s largest talent company and a partner of choice to clients.” Source: RevenueBase Database · checked Sep 29, 2026
3	Manpowergroup	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 29, 2026	10001+	27,063 contacts →
	Indirect evidence “ManpowerGroup® (NYSE: MAN), the leading global workforce solutions company, helps organizations transform in a fast-changing world of work by sourcing, assessing, developing and…” Source: RevenueBase Database · checked Sep 29, 2026
4	Robert Half	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 29, 2026	10001+	25,574 contacts →
	Indirect evidence “At Robert Half, we prioritize your security-if you believe you've encountered a scam or fraudulent recruiter, please report it immediately to All Robert Half recruiters…” Source: RevenueBase Database · checked Sep 29, 2026
5	HAYS	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	5,001-10,000	22,731 contacts →
	Indirect evidence “At Hays, we believe that the right job can transform a person's life - and the right person can transform a business.” Source: RevenueBase Database · checked Sep 29, 2026
6	Manpower	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 29, 2026	10001+	22,508 contacts →
	Indirect evidence “Manpower is the global leader in contingent and permanent recruitment workforce solutions.” Source: RevenueBase Database · checked Sep 29, 2026
7	Aerotek	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 29, 2026	n/a	18,268 contacts →
	Indirect evidence “From economic headwinds to talent complexities, the challenges facing North American industry are real.” Source: RevenueBase Database · checked Sep 29, 2026
8	Insight Global	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	n/a	15,553 contacts →
	Indirect evidence “Insight Global is an international talent and consulting company that delivers business outcomes in an ever-changing world.” Source: RevenueBase Database · checked Sep 29, 2026
9	Express Employment International	Indirect evidence	Oklahoma City, OK, United StatesHQ checked Sep 29, 2026	10001+	12,647 contacts →
	Indirect evidence “Founded in 1983 and corporately headquartered in Oklahoma City, Express Employment International supports the Express Employment Professionals franchise and related brands.” Source: RevenueBase Database · checked Sep 29, 2026
10	GI Group	Indirect evidence	Milan, United StatesHQ checked Sep 29, 2026	1,001-5,000	11,772 contacts →
	Indirect evidence “We are Gi Group, one of the world’s leading providers of operational workforce solutions.” Source: RevenueBase Database · checked Sep 29, 2026
11	Randstad USA	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	1,001-5,000	8,522 contacts →
	Indirect evidence “Randstad North America, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
12	Kforce INC	Partial evidence	Tampa, FL, United StatesHQ checked Sep 29, 2026	1,001-5,000	6,147 contacts →
	Partial evidence “Kforce is a solutions firm specializing in technology, finance and accounting, and professional staffing services.” Source: RevenueBase Database · checked Sep 29, 2026
13	Tradesmen International	Indirect evidence	Macedonia, OH, United StatesHQ checked Sep 29, 2026	10001+	4,999 contacts →
	Indirect evidence “Founded in 1992, Tradesmen International is North America’s premier resource for proven skilled craftsmen and labor consulting services.” Source: RevenueBase Database · checked Sep 29, 2026
14	Lancesoft, INC	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 29, 2026	5,001-10,000	4,877 contacts →
	Indirect evidence “Established in LanceSoft is a pioneer in delivering top-notch Global Workforce Solutions and IT Services to a diverse clientele.” Source: RevenueBase Database · checked Sep 29, 2026
15	VOLT	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,831 contacts →
	Indirect evidence “Volt (an Innova Solutions affiliate) is a multi-award winning global workforce solutions provider that propels businesses and careers forward with expert momentum.” Source: RevenueBase Database · checked Sep 29, 2026
16	Brunel	Partial evidence	Amsterdam, GermanyHQ checked Sep 29, 2026	10001+	4,633 contacts →
	Partial evidence “At Brunel, we help organisations solve workforce challenges and deliver critical projects through the power of people.” Source: RevenueBase Database · checked Sep 29, 2026
17	Appleone Employment Services	Indirect evidence	Glendale, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,627 contacts →
	Indirect evidence “AppleOne Employment Services is a full-service employment company.” Source: RevenueBase Database · checked Sep 29, 2026
18	Spherion	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	10001+	4,263 contacts →
	Partial evidence “We’re Spherion-a staffing and recruiting pioneer that’s been driving careers and helping businesses grow for over 75 years.” Source: RevenueBase Database · checked Sep 29, 2026
19	Select Staffing	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	10001+	3,934 contacts →
	Partial evidence “Select Staffing is a leading provider of temporary staffing and employment services in the U.S, with nationwide operations across multiple contingent staffing sectors.” Source: RevenueBase Database · checked Sep 29, 2026
20	Artech L.L.C	Partial evidence	Morristown, NJ, United StatesHQ checked Sep 29, 2026	5,001-10,000	3,674 contacts →
	Partial evidence “Artech is the largest Women-Owned IT Staffing Firm in the U.S, with 34+ years of experience powering workforce transformation for Fortune 500 companies and public-sector…” Source: RevenueBase Database · checked Sep 29, 2026
21	Manpower France	Indirect evidence	Puteaux, FranceHQ checked Sep 29, 2026	1,001-5,000	3,619 contacts →
	Indirect evidence “Manpower France est une marque de ManpowerGroup France qui propose aux entreprises des solutions en matière de recrutement sous le label Conseil Recrutement et des solutions aux…” Source: RevenueBase Database · checked Sep 29, 2026
22	Elwood Staffing Services, INC	Indirect evidence	Columbus, IN, United StatesHQ checked Sep 29, 2026	n/a	3,481 contacts →
	Indirect evidence “Whether you're looking to find your next great employee, make your next career move, or help a friend find a new job, you can trust that Elwood puts its passion and expertise into…” Source: RevenueBase Database · checked Sep 29, 2026
23	Randstad India	Indirect evidence	Chennai, IndiaHQ checked Sep 29, 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 29, 2026
24	Allegis Group	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 29, 2026	10001+	3,103 contacts →
	Indirect evidence “As the global leader in talent solutions, we take pride in what we do, connecting great people to great opportunities, helping businesses win and careers soar.” Source: RevenueBase Database · checked Sep 29, 2026
25	NES Fircroft	Partial evidence	Altrincham, United KingdomHQ checked Sep 29, 2026	1,001-5,000	2,951 contacts →
	Partial evidence “With over 90 years’ combined experience of delivering workforce solutions to the global energy industry, NES Fircroft is proud to be the world’s leading engineering staffing…” Source: RevenueBase Database · checked Sep 29, 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: project staffing 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 project staffing services.
Partial evidence: Its own public description names part of project staffing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name project staffing 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 29,458 project staffing services worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 148,212 reachable decision-makers.

Free signup · no credit card

View the full list →

Project staffing services worldwide at a glance

As of Sep 29, 2026

13.9%Verified-email coverage

36.1Average contacts per company

11-50Median size (employees)

2.4%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

12,028

11-50

8,804

51-200

4,971

201-500

1,805

501-1,000

807

1,001-5,000

670

5,001-10,000

126

10001+

158

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 project staffing 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.
Coverage: Every country. Country and city lists for project staffing services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “project staffing 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 project staffing 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 project staffing services, 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, 148,212 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 29, 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.

Project staffing services by location

153 lists · largest first

Every Project staffing services 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 project staffing 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 project staffing services are there worldwide?

RevenueBase identified 29,458 project staffing services 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?

Adecco, headquartered in Zurich, tops this list with the largest team on record.

Which country has the most project staffing services?

The United States leads with 8,246 companies, followed by the United Kingdom (2,875) and India (2,863). Every project staffing services list by country and city is linked on this page.

Which city has the most project staffing services?

London leads with 708 headquartered companies, followed by Hyderabad (295) and New York (279).

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 148,212 verified decision-maker contacts tracked across these 29,458 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 29, 2026.

Ready to reach these companies? Verified emails and direct dials for all 29,458 project staffing services worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.