Company lists · Data refreshed September 2026

Top 25 Financial services software development companies based in London, United Kingdom

Name: Financial services software development companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 216 companies tracked

RevenueBase identified 216 financial services software development companies headquartered in London, United Kingdom as of September 2026 and tracks 16,928 professional contacts across them, including 7,519 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers financial services software development companies headquartered in London, 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 28, 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 28, 2026 86% judged on-target in blind review

216Companies

16,928Contacts tracked

7,519Verified emails

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The 25 largest financial services software development companies based in London, United Kingdom

Ranked by team size

Top 25 of 216 financial services software development companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to financial services software development 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	ION	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	3,655 contacts →
	Strong evidence “We’re visionary innovators who are delivering mission-critical trading and workflow automation software to financial institutions, corporations, central banks, and governments.” Source: RevenueBase Database · checked Sep 28, 2026
2	Wolters Kluwer	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	1,279 contacts →
	Partial evidence “Wolters Kluwer Financial Services Solutions are offerings of the company’s Financial & Corporate Compliance.” Source: RevenueBase Database · checked Sep 28, 2026
3	Fidessa	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	480 contacts →
	Partial evidence “Exceptional trading, investment and information solutions for the world's financial community.” Source: RevenueBase Database · checked Sep 28, 2026
4	Finova	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	379 contacts →
	Partial evidence “Finova is a leading UK lending and savings technology provider, helping financial institutions stay ahead with a flexible and proven suite of solutions.” Source: RevenueBase Database · checked Sep 28, 2026
5	Genesis Global	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	220 contacts →
	Strong evidence “Genesis Global enables financial markets organizations to innovate at speed through a software application development platform, prepackaged solutions and deep expertise in…” Source: RevenueBase Database · checked Sep 28, 2026
6	Adenza	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	208 contacts →
	Indirect evidence “We create and deliver market-leading solutions to help you optimize investment, unlock value and drive growth.” Source: RevenueBase Database · checked Sep 28, 2026
7	ICS Financial Systems - Icsfs	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	200 contacts →
	Strong evidence “ICSFS is a global financial and banking software solutions provider, that has been servicing the financial and banking industry for many decades through its multi-award-winning…” Source: RevenueBase Database · checked Sep 28, 2026
8	Neptune Software Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	158 contacts →
	Indirect evidence “Traditionally, core banking solutions revolved around products rather than customer needs.” Source: RevenueBase Database · checked Sep 28, 2026
9	Tieto Financial Solutions	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	134 contacts →
	Strong evidence “Tieto is a global provider of core banking and financial software solutions incorporating mortgage & savings solutions, e-Banking, e-Savings, installment credit, collections…” Source: RevenueBase Database · checked Sep 28, 2026
10	Corfinancial	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	88 contacts →
	Strong evidence “Corfinancial provides software and advice to the financial services sector around the world.” Source: RevenueBase Database · checked Sep 28, 2026
11	Rndpoint	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	71 contacts →
	Strong evidence “RNDpoint is a global software solutions provider with a focus on FinTech, AI, and software development productivity.” Source: RevenueBase Database · checked Sep 28, 2026
12	Singletrack	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	70 contacts →
	Indirect evidence “Singletrack Sell Side helps banks, brokers and IRPs leverage their research, sales and corporate assets to maximum advantage in an increasingly competitive marketplace.” Source: RevenueBase Database · checked Sep 28, 2026
13	Validata Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	68 contacts →
	Partial evidence “Validata Group is an international company that empowers banks and financial services with continuous quality engineering, smart ‘progressive’ data migration and enterprise…” Source: RevenueBase Database · checked Sep 28, 2026
14	GPM	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	60 contacts →
	Strong evidence “GPM Development Ltd is an independent software and IT development company based in the Lloyd's building.” Source: RevenueBase Database · checked Sep 28, 2026
15	Quantios Formally Microgen	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	48 contacts →
	Partial evidence “Founded in 1974 and listed on the London Stock Exchange since 1983, Microgen develops, implements and supports business-critical software.” Source: RevenueBase Database · checked Sep 28, 2026
16	SKO Systems	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	45 contacts →
	Partial evidence “At SKO Systems, we engineer enterprise-grade software ecosystems designed for the unique, high-stakes realities of the maritime environment.” Source: RevenueBase Database · checked Sep 28, 2026
17	Fairmort Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	36 contacts →
	Partial evidence “Fairmort is a software product & consultancy company.” Source: RevenueBase Database · checked Sep 28, 2026
18	Phinsys Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	35 contacts →
	Partial evidence “Phinsys specialises in providing innovative solutions to insurance companies financial accounting, regulatory reporting and analytical needs.” Source: RevenueBase Database · checked Sep 28, 2026
19	A-Development	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	35 contacts →
	Strong evidence “A-development is a custom software development company that offers smart services for a wide range of businesses.” Source: RevenueBase Database · checked Sep 28, 2026
20	Netdania	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	34 contacts →
	Partial evidence “Established in 1998, Netdania has emerged as a leading figure in financial technology.” Source: RevenueBase Database · checked Sep 28, 2026
21	Avidi Technologies	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	33 contacts →
	Indirect evidence “Avidi Technologies is an Innovative English - Ukrainian IT company with headquarters in London, UK, and R&D centers in Ivano-Frankivsk, Kharkiv, and Ternopil, Ukraine; with…” Source: RevenueBase Database · checked Sep 28, 2026
22	Mahimarkets	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	31 contacts →
	Indirect evidence “Combining extensive trading knowledge and robust engineering, we’ve been crafting solutions for banks and brokers since 2010; helping our customers to drive PnL and deliver low…” Source: RevenueBase Database · checked Sep 28, 2026
23	Celer Technologies	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	30 contacts →
	Strong evidence “Celer Technologies is a global financial software company that creates modular-based systems that have the flexibility to meet today's dynamic business environment.” Source: RevenueBase Database · checked Sep 28, 2026
24	Voodoo Park Certified B Corp	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	22 contacts →
	Partial evidence “Voodoo Park, a certified B Corp, is a Global Technology Services Company that specialises in Financial Services Technology.” Source: RevenueBase Database · checked Sep 28, 2026
25	Mintus	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “Mintus is a financial sector solutions provider dedicated to transforming businesses and enhancing financial institutions' revenues and yields.” Source: RevenueBase Database · checked Sep 28, 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: financial services software development 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 financial services software development companies.
Partial evidence: Its own public description names part of financial services software development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name financial services software development 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 216 financial services software development companies based in London, United Kingdom

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Financial services software development companies based in London, United Kingdom at a glance

As of Sep 28, 2026

44.4%Verified-email coverage

78.4Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

102

11-50

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 216 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 financial services software development 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 London, United Kingdom whose own description of what they do matches “financial services software development 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 financial services software development 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 financial services software development companies, and records with no verified work email. Companies headquartered outside London 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, 7,519 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 28, 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 financial services software development 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 financial services software development companies are there based in London, United Kingdom?

RevenueBase identified 216 financial services software development companies headquartered in London, 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?

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

Which city in the United Kingdom has the most financial services software development companies?

London leads the United Kingdom with 216 headquartered companies, followed by Manchester (11) and Edinburgh (10).

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 7,519 verified decision-maker contacts tracked across these 216 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 28, 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.