Company lists · Data refreshed September 2026

Top 13 Accounting software resellers based in the United Kingdom

RevenueBase identified 33 accounting software resellers headquartered in the United Kingdom as of September 2026 and tracks 2,445 professional contacts across them, including 1,205 with verified work emails. London is the largest hub.

This list covers accounting software resellers 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
33Companies
2,445Contacts tracked
1,205Verified emails
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The 13 largest accounting software resellers based in the United Kingdom

Ranked by team size
Top 13 of 33 accounting software resellers 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 accounting software resellers: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceSlough, United KingdomHQ checked Sep 14, 20261,001-5,0002,218 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
2Partial evidenceLondon, United KingdomHQ checked Sep 14, 202651-20068 contacts →

Partial evidence

“Poklyk, a European based company, develops and provides business management software products and services for micro, small, medium enterprises and self-employed professionals in…”

Source: RevenueBase Database · checked Sep 14, 2026
3Strong evidenceKettering, United KingdomHQ checked Sep 14, 202651-20041 contacts →

Strong 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
4Strong evidenceBellshill, United KingdomHQ checked Sep 14, 202651-20023 contacts →

Strong evidence

“Founded in 1982, Castle Computer Services provides accounting and financial management software, business intelligence solutions, cloud and managed IT services throughout the UK…”

Source: RevenueBase Database · checked Sep 14, 2026
5Indirect evidenceOldham, United KingdomHQ checked Sep 14, 202611-505 contacts →

Indirect evidence

“How can we help?”

Source: RevenueBase Database · checked Sep 14, 2026
6Indirect evidenceSt Albans, United KingdomHQ checked Sep 14, 20261-103 contacts →

Indirect evidence

“Claire takes a genuine interest in my pan-European business, offering advice and ideas across a range of sometimes quite complex issues.”

Source: RevenueBase Database · checked Sep 14, 2026
7Strong evidenceAshford, United KingdomHQ checked Sep 14, 20261-103 contacts →

Strong evidence

“Welcome to Operational Accounting Systems Limited (o-a-sys), a distinguished business based in Kent, dedicated to empowering SMEs through innovative software solutions that…”

Source: RevenueBase Database · checked Sep 14, 2026
8Indirect evidenceRingwood, United KingdomHQ checked Sep 14, 20261-102 contacts →

Indirect evidence

“Accredited Sage Accountant Partner offering Sage Product & Services at less than RRP.”

Source: RevenueBase Database · checked Sep 14, 2026
9Indirect evidenceSwansea, United KingdomHQ checked Sep 14, 20261-102 contacts →

Indirect evidence

“We at HR Harris & Partners have a high level of contact with clients, taking time to understand each business and its unique circumstances.”

Source: RevenueBase Database · checked Sep 14, 2026
10Indirect evidenceWells, United KingdomHQ checked Sep 14, 20261-102 contacts →

Indirect evidence

“Helping Agricultural Machinery Dealers Succeed.”

Source: RevenueBase Database · checked Sep 14, 2026
11Strong evidenceNottingham, United KingdomHQ checked Sep 14, 20261-101 contacts →

Strong evidence

“Online Accounting are a business software company dedicated to helping our clients achieve their goals using intelligent software solutions.”

Source: RevenueBase Database · checked Sep 14, 2026
12Partial evidenceAlfreton, United KingdomHQ checked Sep 14, 20261-101 contacts →

Partial evidence

“IDL Systems are specialists in accounting, manufacturing and CRM solutions.”

Source: RevenueBase Database · checked Sep 14, 2026
13Indirect evidenceDaresbury, United KingdomHQ checked Sep 14, 20261-101 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 14, 2026

Showing 13 of 33 accounting software resellers based in the United Kingdom

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Accounting software resellers based in the United Kingdom at a glance

As of Sep 14, 2026
49.3%Verified-email coverage
74.1Average contacts per company
1-10Median size (employees)
15.2%Largest-city concentration · London
Sep 14, 2026Page data refreshed

Companies by employee count

1-10
22
11-50
5
51-200
4
1,001-5,000
2

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 33 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 accounting software resellers, 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 “accounting software resellers”. 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 accounting software resellers), 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 accounting software resellers, 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, 1,205 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.

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 accounting software resellers, 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 accounting software resellers are there based in the United Kingdom?

RevenueBase identified 33 accounting software resellers 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?

Iris Software Group, headquartered in Slough, tops this list with the largest team on record.

Which city has the most accounting software resellers?

London leads with 5 headquartered companies, followed by Slough (2) and Aberkenfig (1).

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 1,205 verified decision-maker contacts tracked across these 33 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.