Company lists · Data refreshed September 2026

Top 25 Core administrative processing systems software companies based in the United Kingdom

Name: Core administrative processing systems software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 129 companies tracked

RevenueBase identified 129 core administrative processing systems software companies headquartered in the United Kingdom as of September 2026 and tracks 23,802 professional contacts across them, including 9,897 with verified work emails. London is the largest hub.

This list covers core administrative processing systems software companies 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 14, 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 14, 2026 86% judged on-target in blind review

129Companies

23,802Contacts tracked

9,897Verified emails

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The 25 largest core administrative processing systems software companies based in the United Kingdom

Ranked by team size

Top 25 of 129 core administrative processing systems software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to core administrative processing systems software companies: 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	SAGE	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 14, 2026	10001+	13,063 contacts →
	Indirect evidence “At Sage, we knock down barriers with information, insights, and tools to help your business flow.” Source: RevenueBase Database · checked Sep 14, 2026
2	NGA Human Resources, An Alight Company	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	1,001-5,000	2,734 contacts →
	Indirect evidence “At Alight \| NGA Human Resources our mission is to make HR work better.” Source: RevenueBase Database · checked Sep 14, 2026
3	Oneadvanced	Partial evidence	Birmingham, United KingdomHQ checked Sep 14, 2026	1,001-5,000	2,242 contacts →
	Partial evidence “Founded in 2008 OneAdvanced has grown into one of the UK’s largest providers of business software and services serving global customers with an annual turnover of £330M+.” Source: RevenueBase Database · checked Sep 14, 2026
4	Iris Software Group	Partial evidence	Slough, United KingdomHQ checked Sep 14, 2026	1,001-5,000	2,218 contacts →
	Partial evidence “IRIS Software Group is a leading business software and services provider, one of the UK’s largest privately held software companies.” Source: RevenueBase Database · checked Sep 14, 2026
5	Zellis	Indirect evidence	Bristol, United KingdomHQ checked Sep 14, 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 14, 2026
6	Frontier Software	Partial evidence	Lightwater, United KingdomHQ checked Sep 14, 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 14, 2026
7	Softbrands	Indirect evidence	Farnborough, United KingdomHQ checked Sep 14, 2026	501-1,000	177 contacts →
	Indirect evidence “In 2009 SoftBrands was bought by Infor and is now a part of the Infor Hospitality Suite.” Source: RevenueBase Database · checked Sep 14, 2026
8	Cezanne HR	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	127 contacts →
	Partial evidence “Cezanne HR is leading the way in delivering smart, sophisticated and cost-effective Cloud HR and Native payroll software to UK and international businesses.” Source: RevenueBase Database · checked Sep 14, 2026
9	XCD	Partial evidence	Basingstoke, United KingdomHQ checked Sep 14, 2026	51-200	95 contacts →
	Partial evidence “Take control of your HR processes with xcd, the single-solution HR and Payroll software which helps put you back in control and achieve more.” Source: RevenueBase Database · checked Sep 14, 2026
10	kpi.com	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	87 contacts →
	Indirect evidence “KPI is an all-in-one business solution providing: Accounting, Payroll, Sales, Human Resources, Project Management, Report and Document applications all in one platform according…” Source: RevenueBase Database · checked Sep 14, 2026
11	Sci-Net Business Solutions	Indirect evidence	Chipping Norton, United KingdomHQ checked Sep 14, 2026	11-50	53 contacts →
	Indirect evidence “At Sci-Net Business Solutions (now part of the ANS Group) we are passionate and driven by the success of our customers.” Source: RevenueBase Database · checked Sep 14, 2026
12	Safe Computing	Partial evidence	Leicester, United KingdomHQ checked Sep 14, 2026	201-500	45 contacts →
	Partial evidence “Safe Computing, now part of Access Group is a vibrant Leicester-based software & services company.” Source: RevenueBase Database · checked Sep 14, 2026
13	KEY Computer Applications LTD	Partial evidence	Leigh, United KingdomHQ checked Sep 14, 2026	51-200	41 contacts →
	Partial evidence “We are experts in helping businesses work smarter to reduce costs and improve efficiency through our core solutions: Service manager, Warehouse manager, Cloud server and Business…” Source: RevenueBase Database · checked Sep 14, 2026
14	Pegasus Software	Partial evidence	Kettering, United KingdomHQ checked Sep 14, 2026	51-200	41 contacts →
	Partial evidence “Pegasus Software is one of the UK's leading suppliers of accounting software, cloud accounting software, business solutions and payroll software and has been for over 30 years.” Source: RevenueBase Database · checked Sep 14, 2026
15	Vero HR	Indirect evidence	Peterborough, United KingdomHQ checked Sep 14, 2026	11-50	36 contacts →
	Indirect evidence “Are you seeking expert assistance in navigating the intricate world of human resources, payroll, and more?” Source: RevenueBase Database · checked Sep 14, 2026
16	Tugela People	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 14, 2026	11-50	28 contacts →
	Indirect evidence “With over a decade of industry experience and expertise, Tugela People empowers companies to achieve their objectives by providing people-centric, cloud-based solutions and…” Source: RevenueBase Database · checked Sep 14, 2026
17	Solutiondot	Strong evidence	Birmingham, United KingdomHQ checked Sep 14, 2026	51-200	28 contacts →
	Strong evidence “SolutionDots has a new approach to designing, building and using business managing software or ERP systems, our ERP software maximizes productivity across your entire organization.” Source: RevenueBase Database · checked Sep 14, 2026
18	Advanced Business & Healthcare Solutions India PVT LTD	Partial evidence	Kt11 1tf, United KingdomHQ checked Sep 14, 2026	11-50	22 contacts →
	Partial evidence “Advanced Computer Software Group plc: is a Leader in Software & IT Services - Advanced Computer Software Group plc comprises three main divisions: Business Solutions, Health &…” Source: RevenueBase Database · checked Sep 14, 2026
19	Aethersys	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	18 contacts →
	Indirect evidence “Aethersys are small but dynamic London based IT consultancy.” Source: RevenueBase Database · checked Sep 14, 2026
20	Access Peoplehr	Indirect evidence	Loughborough, United KingdomHQ checked Sep 14, 2026	201-500	16 contacts →
	Indirect evidence “Access PeopleHR is part of The Access Group, and together we are supporting the world of HR.” Source: RevenueBase Database · checked Sep 14, 2026
21	Humony	Indirect evidence	Basingstoke, United KingdomHQ checked Sep 14, 2026	11-50	15 contacts →
	Indirect evidence “With over 30 years’ experience under our belt in helping our valued clients to work smarter, we find business solutions to your problems.” Source: RevenueBase Database · checked Sep 14, 2026
22	Technopoly	Partial evidence	Newquay, United KingdomHQ checked Sep 14, 2026	11-50	13 contacts →
	Partial evidence “Technopoly Ltd is a successful and well established UK based software company with over 25 years of experience.” Source: RevenueBase Database · checked Sep 14, 2026
23	Wealden HR & Payroll Solutions	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	13 contacts →
	Indirect evidence “Since 1983, Wealden has been providing industry-leading HR, Payroll and Time & Attendance solutions to clients as diverse as government bodies, international groups, schools and…” Source: RevenueBase Database · checked Sep 14, 2026
24	Chronologic LTD	Indirect evidence	Midsomer Norton, United KingdomHQ checked Sep 14, 2026	11-50	13 contacts →
	Indirect evidence “Chronologic helps businesses across the UK thrive by elevating their teams and solving workforce challenges.” Source: RevenueBase Database · checked Sep 14, 2026
25	Life & Pension Systems	Strong evidence	Liverpool, United KingdomHQ checked Sep 14, 2026	11-50	12 contacts →
	Strong evidence “Life & Pension Systems is an independent software provider specialising in employee benefit and pension administration solutions.” Source: RevenueBase Database · checked Sep 14, 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: core administrative processing systems software companies. 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 core administrative processing systems software companies.
Partial evidence: Its own public description names part of core administrative processing systems software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name core administrative processing systems software companies. 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 129 core administrative processing systems software companies based in the United Kingdom

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Core administrative processing systems software companies based in the United Kingdom at a glance

As of Sep 14, 2026

41.6%Verified-email coverage

184.5Average contacts per company

11-50Median size (employees)

26.4%Largest-city concentration · London

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 129 companies.

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 core administrative processing systems software companies, 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 “core administrative processing systems software companies”. 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 core administrative processing systems software companies), 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 core administrative processing systems software companies, 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, 9,897 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 14, 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.

Core administrative processing systems software companies by metro

Core administrative processing systems software companies in London34

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 core administrative processing systems software companies, 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 core administrative processing systems software companies are there based in the United Kingdom?

RevenueBase identified 129 core administrative processing systems software companies 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?

SAGE, headquartered in Newcastle Upon Tyne, tops this list with the largest team on record.

Which city has the most core administrative processing systems software companies?

London leads with 34 headquartered companies, followed by Birmingham (4) and Manchester (4).

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 9,897 verified decision-maker contacts tracked across these 129 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 14, 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.