Company lists · Data refreshed September 2026

Top 25 HR outsourcing service providers based in London, United Kingdom

Name: HR outsourcing service providers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 558 companies tracked

RevenueBase identified 558 company matches for HR outsourcing service providers associated with London, United Kingdom as of September 2026 and tracks 9,184 professional contacts across them, including 1,477 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for HR outsourcing service providers associated with London, 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 30, 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 30, 2026 How this list was built

558Companies

9,184Contacts tracked

1,477Verified emails

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The 25 largest HR outsourcing service providers based in London, United Kingdom

Ranked by team size

Top 25 of 558 company matches for HR outsourcing service providers based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 30, 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 30, 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 30, 2026 · View company records in RevenueBase
2	Page Outsourcing	Exact match	London, United KingdomHQ recorded Sep 30, 2026	5,001-10,000	390 contacts →
	Exact match “Page Outsourcing was created to meet the business transformation needs of our clients.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
3	Ubique Systems	Exact match	London, United KingdomHQ recorded Sep 30, 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 30, 2026 · View company records in RevenueBase
4	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
5	Huntress	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	289 contacts →
	Exact match “Since our establishment in Huntress has been at the forefront of recruitment across a range of specialist sectors.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
6	Ixceed Solutions	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	137 contacts →
	Exact match “iXceed Solutions is a global, end-to-end Talent Solutions, RPO, EOR, Enterprise Services, and Digital Transformation partner trusted by Fortune 100 and high-growth organizations…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
7	Newforce Global Services	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	128 contacts →
	Exact match “Newforce provides global recruitment and workforce staffing solutions that help organizations access skilled talent across multiple markets.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
8	Omnipresent	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	124 contacts →
	Exact match “Omnipresent was acquired by Deel in October of 2025.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
9	Peoplescout Emea	Exact match	London, United KingdomHQ recorded Sep 30, 2026	1,001-5,000	114 contacts →
	Exact match “Different skillset.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
10	Hyphen Workforce Solutions	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	92 contacts →
	Exact match “Hyphen is an industry leader in the fields of Recruitment Process Outsourcing (RPO) and Managed Service Programmes (MSP).” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
11	Outsourcery	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	84 contacts →
	Exact match “UK businesses are under pressure- Hiring is slower- Costs are rising- And internal teams are stretched thin.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
12	The Portfolio Group	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	66 contacts →
	Exact match “The Portfolio Group is a specialist recruitment agency dedicated to sourcing exceptional talent across four key divisions: Payroll, Credit Control, Procurement and HR, Benefits &…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
13	SCEDE	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	64 contacts →
	Exact match “Scede is a trusted scaling partner for tech companies globally, offering a breadth of talent acquisition, people operations and training services, designed to solve key growth…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
14	Darwin Rhodes	Exact match	London, United KingdomHQ recorded Sep 30, 2026	51-200	59 contacts →
	Exact match “Darwin Rhodes has an unrivalled heritage and was one of the first recruitment firms to specialize in the Insurance market.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
15	Oakleaf Partnership	Exact match	London, United KingdomHQ recorded Sep 30, 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 30, 2026 · View company records in RevenueBase
16	Hunter Adams	Exact match	London, United KingdomHQ recorded Sep 30, 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 30, 2026 · View company records in RevenueBase
17	Warriorz Technologies	Exact match	London, United KingdomHQ recorded Sep 30, 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 30, 2026 · View company records in RevenueBase
18	Project Recruit	Exact match	London, United KingdomHQ recorded Sep 30, 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 30, 2026 · View company records in RevenueBase
19	Teamed	Exact match	London, United KingdomHQ recorded Sep 30, 2026	11-50	40 contacts →
	Exact match “At Teamed, we simplify the process of building teams - no matter where they are in the world.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
20	Aviserv	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	40 contacts →
	Exact match “We help multi-national and SME's to help manage their complex staff and human resource needs in some of the most challenging environment such as Airports and Hospitals.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
21	Fitzgerald	Exact match	London, United KingdomHQ recorded Sep 30, 2026	11-50	38 contacts →
	Exact match “We’re the full-service HR consultancy that synchronises seamlessly with your business.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
22	Whitecollars	Exact match	London, United KingdomHQ recorded Sep 30, 2026	11-50	35 contacts →
	Exact match “We are Whitecollars, the global Human Resource consulting and recruitment agency that supports your business growth with affordable, flat-fee recruitment solutions and tailored HR…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
23	The Opra Group	Exact match	London, United KingdomHQ recorded Sep 30, 2026	11-50	34 contacts →
	Exact match “The OPRA Group provides a complete portfolio of People Solutions designed to help organisations make confident, consistent, and future‑focused decisions.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
24	UDDER	Exact match	London, United KingdomHQ recorded Sep 30, 2026	11-50	30 contacts →
	Exact match “We help forward-thinking HR, TA and Learning leaders to take full advantage of the ROI that modern HR tech can bring to their organisations.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
25	Verto HR	Exact match	London, United KingdomHQ recorded Sep 30, 2026	201-500	30 contacts →
	Exact match “Verto HR, professional in-house HR experts, jointly managing your external on-site property staff.” Recorded in the RevenueBase company graph · Sep 30, 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 “HR outsourcing service providers”. 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 558 HR outsourcing service providers based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 1,477 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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HR outsourcing service providers based in London, United Kingdom at a glance

As of Sep 30, 2026

16.1%Verified-email coverage

16.5Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

370

11-50

125

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 558 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 London, United Kingdom whose business descriptions match “HR outsourcing service providers” 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 1,477 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 30, 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.

HR outsourcing service providers by metro in the United Kingdom

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 “HR outsourcing service providers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many HR outsourcing service providers are there based in London, United Kingdom?

RevenueBase identified 558 company matches for HR outsourcing service providers associated with London, 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 in the United Kingdom has the most HR outsourcing service providers?

London leads the United Kingdom with 558 company records, followed by Manchester (66) and Bristol (34).

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 1,477 professional contacts with verified work emails tracked across these 558 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 30, 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 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.