Company lists · Data refreshed September 2026

Top 25 HR business process outsourcing firms based in the United Kingdom

Name: HR business process 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 30, 2026 2,294 companies tracked

RevenueBase identified 2,294 HR business process outsourcing firms headquartered in the United Kingdom as of September 2026 and tracks 46,719 professional contacts across them, including 12,820 with verified work emails and 2,374 with mobile numbers. London is the largest hub.

This list covers HR business process outsourcing firms headquartered in the United Kingdom, 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 30, 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 30, 2026 86% judged on-target in blind review

2,294Companies

46,719Contacts tracked

12,820Verified emails

2,374Mobile numbers

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The 25 largest HR business process outsourcing firms based in the United Kingdom

Ranked by team size

Top 25 of 2,294 HR business process outsourcing firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to HR business process 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	Capita	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	10001+	20,824 contacts →
	Partial evidence “Capita is an outsourcer, helping clients across the public and private sectors run complex business processes more efficiently, creating better consumer experiences.” Source: RevenueBase Database · checked Sep 30, 2026
2	QX Global Group	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,115 contacts →
	Partial evidence “QX Global Group is a sector‑led, technology‑enabled Business Process Management partner serving mid‑market organizations across the US, UK, and Ireland.” Source: RevenueBase Database · checked Sep 30, 2026
3	NGA Human Resources, An Alight Company	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	2,734 contacts →
	Partial evidence “At Alight \| NGA Human Resources our mission is to make HR work better.” Source: RevenueBase Database · checked Sep 30, 2026
4	Zellis	Indirect evidence	Bristol, United KingdomHQ checked Sep 30, 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 30, 2026
5	Oliver James	Indirect evidence	Manchester, United KingdomHQ checked Sep 30, 2026	501-1,000	870 contacts →
	Indirect evidence “At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.” Source: RevenueBase Database · checked Sep 30, 2026
6	ROC	Indirect evidence	Weybridge, United KingdomHQ checked Sep 30, 2026	501-1,000	532 contacts →
	Indirect evidence “We are a leading service provider of Human Capital Management (HCM) solutions across Europe, serving more than 1.5 million employees monthly with an annual revenue of 78 million…” Source: RevenueBase Database · checked Sep 30, 2026
7	Frontier Software	Partial evidence	Lightwater, United KingdomHQ checked Sep 30, 2026	201-500	507 contacts →
	Partial evidence “Established in 1983, Frontier Software is an acknowledged leader in the provision of a global HR & Payroll software solution.” Source: RevenueBase Database · checked Sep 30, 2026
8	Sensée	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	406 contacts →
	Indirect evidence “In 2004, Sensée was founded on a simple principle: bring work to people, not people to work.” Source: RevenueBase Database · checked Sep 30, 2026
9	Croner	Partial evidence	Wheatfield Way, United KingdomHQ checked Sep 30, 2026	201-500	400 contacts →
	Partial evidence “Our award winning HR and health & safety services free you from workforce admin and help keep you on the right side of the law.” Source: RevenueBase Database · checked Sep 30, 2026
10	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 30, 2026
11	Momenta	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	313 contacts →
	Indirect evidence “With over 30 years of experience servicing blue-chip clients, Momenta Group is renowned for our expertise and quality-driven approach.” Source: RevenueBase Database · checked Sep 30, 2026
12	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 30, 2026
13	Huntress	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	289 contacts →
	Indirect evidence “Since our establishment in Huntress has been at the forefront of recruitment across a range of specialist sectors.” Source: RevenueBase Database · checked Sep 30, 2026
14	CIPHR	Partial evidence	Reading, United KingdomHQ checked Sep 30, 2026	201-500	219 contacts →
	Partial evidence “We provide HR, payroll, benefits and learning solutions for UK organisations with employees.” Source: RevenueBase Database · checked Sep 30, 2026
15	Adviserplus	Partial evidence	Ellesmere Port, United KingdomHQ checked Sep 30, 2026	201-500	205 contacts →
	Partial evidence “AdviserPlus is the UK’s leading provider of HR technology, consulting, and advisory services.” Source: RevenueBase Database · checked Sep 30, 2026
16	Omni RMS	Indirect evidence	Altrincham, United KingdomHQ checked Sep 30, 2026	51-200	190 contacts →
	Indirect evidence “Omni – Talent Is Everything At Omni, we help businesses find, attract, and retain the right people to drive long-term success.” Source: RevenueBase Database · checked Sep 30, 2026
17	Potentiam LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	150 contacts →
	Indirect evidence “At Potentiam, we help businesses unlock growth by building nearshore and offshore teams that empower organisations to scale faster, operate smarter and stay ahead of the…” Source: RevenueBase Database · checked Sep 30, 2026
18	Cintra HR & Payroll Services	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 30, 2026	51-200	148 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 30, 2026
19	The DOT HQ	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 30, 2026	51-200	146 contacts →
	Indirect evidence “At The Dot HQ, we empower businesses with a full spectrum of offshore resource solutions, ensuring efficiency, compliance and growth.” Source: RevenueBase Database · checked Sep 30, 2026
20	Ixceed Solutions	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	137 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 30, 2026
21	Lace Partners	Partial evidence	South Bank, United KingdomHQ checked Sep 30, 2026	51-200	129 contacts →
	Partial evidence “Overview LACE Partners is trusted advisors to HR and business leaders navigating complex workforce challenges.” Source: RevenueBase Database · checked Sep 30, 2026
22	Omnipresent	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	124 contacts →
	Indirect evidence “Omnipresent was acquired by Deel in October of 2025.” Source: RevenueBase Database · checked Sep 30, 2026
23	Talent Solutions UK	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	120 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 30, 2026
24	People Puzzles	Indirect evidence	Duxford, United KingdomHQ checked Sep 30, 2026	51-200	116 contacts →
	Indirect evidence “Better people, better business, better life.” Source: RevenueBase Database · checked Sep 30, 2026
25	Peoplescout Emea	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	114 contacts →
	Indirect evidence “Different skillset.” Source: RevenueBase Database · checked Sep 30, 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 business process 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 HR business process outsourcing firms.
Partial evidence: Its own public description names part of HR business process outsourcing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name HR business process 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 2,294 HR business process outsourcing firms based in the United Kingdom

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HR business process outsourcing firms based in the United Kingdom at a glance

As of Sep 30, 2026

27.4%Verified-email coverage

5.1%Mobile-number coverage

20.4Average contacts per company

1-10Median size (employees)

26.4%Largest-city concentration · London

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

1,683

11-50

410

51-200

121

201-500

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 33.0d

3,8670–30

8,50531–60

36961–90

490–180

75180+

Company record updated

Median 96.0d

00–30

2,46931–60

15,19161–90

26,34490–180

2,715180+

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 business process 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.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “HR business process 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 HR business process 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 HR business process outsourcing firms, and records with no verified work email. Companies headquartered outside United Kingdom 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, 12,820 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 30, 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 business process outsourcing firms 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 business process 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 HR business process outsourcing firms are there based in the United Kingdom?

RevenueBase identified 2,294 HR business process outsourcing firms headquartered in the United Kingdom 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?

Capita, headquartered in London, tops this list with the largest team on record.

Which city has the most HR business process outsourcing firms?

London leads with 606 headquartered companies, followed by Manchester (63) and Bristol (31).

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 12,820 verified decision-maker contacts tracked across these 2,294 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 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 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.