Company lists · Data refreshed September 2026

Top 25 Human resources outsourcing firms based in the United Kingdom

Name: Human resources outsourcing firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,552 companies tracked

RevenueBase identified 1,552 company matches for human resources outsourcing firms associated with the United Kingdom as of September 2026 and tracks 12,710 professional contacts across them, including 4,091 with verified work emails. London is the largest hub.

This list covers company matches for human resources outsourcing firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

1,552Companies

12,710Contacts tracked

4,091Verified emails

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

The 25 largest human resources outsourcing firms based in the United Kingdom

Ranked by team size

Top 25 of 1,552 company matches for human resources outsourcing firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	NGA Human Resources, An Alight Company	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	2,734 contacts →
	Exact match “At Alight \| NGA Human Resources our mission is to make HR work better.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Zellis	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	1,465 contacts →
	Exact match “Zellis helps organisations unlock better outcomes by creating exceptional experiences for their people.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Croner	Exact match	Wheatfield Way, United KingdomHQ recorded Sep 28, 2026	201-500	400 contacts →
	Exact match “Our award winning HR and health & safety services free you from workforce admin and help keep you on the right side of the law.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Ubique Systems	Exact match	London, United KingdomHQ recorded Sep 28, 2026	501-1,000	333 contacts →
	Exact match “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Omni RMS	Exact match	Altrincham, United KingdomHQ recorded Sep 28, 2026	51-200	190 contacts →
	Exact match “Omni – Talent Is Everything At Omni, we help businesses find, attract, and retain the right people to drive long-term success.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	The HR Dept	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	51-200	169 contacts →
	Exact match “Welcome to The HR Dept.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Cintra HR & Payroll Services	Exact match	Newcastle Upon Tyne, United KingdomHQ recorded Sep 28, 2026	51-200	148 contacts →
	Exact match “Proudly based in the North East, our multi award-winning Payroll & HR service has been delivering professional payroll and HR solutions for over 40 years.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Lace Partners	Exact match	South Bank, United KingdomHQ recorded Sep 28, 2026	51-200	129 contacts →
	Exact match “Overview LACE Partners is trusted advisors to HR and business leaders navigating complex workforce challenges.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	Avensure LTD	Exact match	Manchester, United KingdomHQ recorded Sep 28, 2026	51-200	127 contacts →
	Exact match “Avensure provides UK businesses with bespoke outsourced HR, Employment Law, and Health & Safety services, built around the principle that protection is personal.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Talent Solutions UK	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	120 contacts →
	Exact match “Talent Solutions combines ManpowerGroup's leading global offerings RPO, TAPFIN-MSP and Right Management to provide end-to-end, data-driven capabilities across the talent lifecycle.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	People Puzzles	Exact match	Duxford, United KingdomHQ recorded Sep 28, 2026	51-200	116 contacts →
	Exact match “Better people, better business, better life.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	NES Advantage Managed Services, Rpo, EOR Staffing Services	Exact match	Manchester, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	99 contacts →
	Exact match “We’ve got a lot to offer our customers; global reach, local expertise, bags of commitment and a huge degree of flexibility and know-how.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Sampeople	Exact match	Calder Grove, United KingdomHQ recorded Sep 28, 2026	51-200	74 contacts →
	Exact match “SAMpeople, SAMpeople Recruit and SAMpeople Payroll” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Payescape LTD	Exact match	Northern Ireland, United KingdomHQ recorded Sep 28, 2026	51-200	67 contacts →
	Exact match “PayEscape is one of the UK’s fastest growing outsourced Payroll, HR and Time Management providers.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Everett SKY	Exact match	Essex, United KingdomHQ recorded Sep 28, 2026	51-200	61 contacts →
	Exact match “Based in Europe, Everett Sky specializes in helping businesses scale their teams for growth through transformative solutions and exceptional customer service.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Cogito	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	11-50	61 contacts →
	Exact match “Working with business leaders and HR teams to transform people strategies, HR and Recruitment teams and deliver improved Return on Investment across the entire employee lifecycle.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Oakleaf Partnership	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	57 contacts →
	Exact match “Since 2005, Oakleaf Partnership has been successfully placing people into jobs across every HR discipline, in every sector imaginable.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Hunter Adams	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	53 contacts →
	Exact match “Hunter Adams is an employee-owned HR consultancy, Interim and recruitment business.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Warriorz Technologies	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	51 contacts →
	Exact match “In a highly technical industry of Information Technology, Warriorz Technologies Ltd is paving the way in Human Resource and Software consulting across the globe.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Randstad UK	Exact match	Luton, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	51 contacts →
	Exact match “Randstad is the world's largest HR services provider and is driven to become the world's most valued 'working life partner', supporting people all over the world to find their…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Industry Resource Services IRS Group	Exact match	Beccles, United KingdomHQ recorded Sep 28, 2026	11-50	47 contacts →
	Exact match “Leading providers of specialist support services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Project Recruit	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	45 contacts →
	Exact match “At Project Recruit, getting to know our clients is at the heart of what we do.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Factotum	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	41 contacts →
	Exact match “Welcome to Factotum-your secret weapon for streamlined business success!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Datum RPO	Exact match	Stonehouse, United KingdomHQ recorded Sep 28, 2026	11-50	41 contacts →
	Exact match “Datum RPO are experts in procuring and managing Contingent Workforce Solutions (CWS) and Permanent Workforce Solutions (PWS) and provide a complete Recruitment Process Outsourcing…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “human resources outsourcing firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,552 human resources outsourcing firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 4,091 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Human resources outsourcing firms based in the United Kingdom at a glance

As of Sep 28, 2026

32.2%Verified-email coverage

8.2Average contacts per company

1-10Median size (employees)

23.0%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,252

11-50

220

51-200

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 Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,552 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “human resources outsourcing firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 4,091 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Human resources outsourcing firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “human resources outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many human resources outsourcing firms are there based in the United Kingdom?

RevenueBase identified 1,552 company matches for human resources outsourcing firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

NGA Human Resources, An Alight Company tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most human resources outsourcing firms?

London leads with 357 company records, followed by Manchester (37) and Bristol (23).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 4,091 professional contacts with verified work emails tracked across these 1,552 companies; direct dials are available where recorded.

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.

Ready to reach these companies? Verified emails and direct dials for all 1,552 human resources outsourcing firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Human resources outsourcing firms by geography

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 SmartSearch, 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.