Company lists · Data refreshed September 2026

Top 25 Institutional trading platforms based in London, United Kingdom

Name: Institutional trading platforms 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 99 companies tracked

RevenueBase identified 99 institutional trading platforms headquartered in London, United Kingdom as of September 2026 and tracks 3,555 professional contacts across them, including 1,414 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers institutional trading platforms 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

99Companies

3,555Contacts tracked

1,414Verified emails

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The 25 largest institutional trading platforms based in London, United Kingdom

Ranked by team size

Top 25 of 99 institutional trading platforms 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 institutional trading platforms: 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	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
2	XTX Markets	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	280 contacts →
	Partial evidence “We are a leading quantitative-driven electronic market-maker partnering with counterparties, exchanges and e-trading venues globally to provide liquidity in the Equity, FX, Fixed…” Source: RevenueBase Database · checked Sep 28, 2026
3	Lseg Tora	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	249 contacts →
	Partial evidence “LSEG TORA is a leading provider of advanced investment management technologies for global asset managers, hedge funds, proprietary trading firms and sell-side trading desks.” Source: RevenueBase Database · checked Sep 28, 2026
4	Finalto	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	213 contacts →
	Indirect evidence “We are Finalto and we’re here to take the global financial markets to new heights.” Source: RevenueBase Database · checked Sep 28, 2026
5	Etrading Software	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	193 contacts →
	Partial evidence “Etrading Software (ETS) was founded in 2004 with the goal of bringing efficiency and stability to the burgeoning electronic trading markets.” Source: RevenueBase Database · checked Sep 28, 2026
6	Quod Financial	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	187 contacts →
	Partial evidence “Quod Financial delivers multi-asset trading technology for banks, brokers, and asset managers, supporting the full trading lifecycle across global electronic markets.” Source: RevenueBase Database · checked Sep 28, 2026
7	Blackwell Global	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	108 contacts →
	Partial evidence “Founded in 2010, the Blackwell Global group of companies (“Blackwell Global”) was established to offer brokerage solutions for private and institutional clients.” Source: RevenueBase Database · checked Sep 28, 2026
8	Gfo-X	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	76 contacts →
	Partial evidence “GFO-X is the UK’s first regulated and centrally cleared trading venue dedicated to digital asset derivatives.” Source: RevenueBase Database · checked Sep 28, 2026
9	Caplin Systems	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	68 contacts →
	Strong evidence “Caplin delivers cutting-edge trading technology, empowering financial institutions with high-performance, multi-asset platforms for FX, crypto, fixed income, and more.” Source: RevenueBase Database · checked Sep 28, 2026
10	Marketaxess Post Trade	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	63 contacts →
	Indirect evidence “Our MarketAxess Post Trade business (formerly known as Trax) is a leading provider of capital markets data, trade matching and regulatory reporting services to the global…” Source: RevenueBase Database · checked Sep 28, 2026
11	Transficc	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	53 contacts →
	Partial evidence “Connecting to all global venues and workflows - Automating trading to manage growing volumes and low latency execution - Hosted SaaS providing out of the box DR, security and…” Source: RevenueBase Database · checked Sep 28, 2026
12	OTCX	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Partial evidence “Whether you are using voice, chat, or email to source or provide liquidity on derivatives, OTCX will streamline your trading workflows and bridge the gap between high touch and…” Source: RevenueBase Database · checked Sep 28, 2026
13	Advanced Markets Group	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Strong evidence “Founded in 2006, Advanced Markets has over a decade of proven success delivering institutional trading solutions across global markets.” Source: RevenueBase Database · checked Sep 28, 2026
14	Isam Securities	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Strong evidence “iSAM Securities*, regulated by the FCA, SFC, and CIMA, is a leading algorithmic trading firm and trusted liquidity, technology and prime services partner to institutional clients…” Source: RevenueBase Database · checked Sep 28, 2026
15	Rapid Addition	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	42 contacts →
	Strong evidence “Rapid Addition is helping financial institutions take advantage of the new world of electronic trading and giving them the flexibility to quickly adapt as markets continue to…” Source: RevenueBase Database · checked Sep 28, 2026
16	Sigma Broking Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	37 contacts →
	Partial evidence “Sigma Broking Limited is a privately-owned brokerage company set up to service the individual needs of institutional customers We offer broking and execution services to…” Source: RevenueBase Database · checked Sep 28, 2026
17	Cleartoken	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	33 contacts →
	Strong evidence “ClearToken brings a clearing house to the market for digital asset trading, lowering counterparty risk and enabling wider institutional adoption.” Source: RevenueBase Database · checked Sep 28, 2026
18	KEY To Markets	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	33 contacts →
	Partial evidence “Key to Markets is an independent brokerage firm offering access to financial markets for institutional investors, companies and private traders.” Source: RevenueBase Database · checked Sep 28, 2026
19	Fixnetix LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	33 contacts →
	Partial evidence “Fixnetix provides market data, trading access, liquidity venue connectivity, pre-trade risk and execution management technologies for Investment Banks, Hedge Funds and Proprietary…” Source: RevenueBase Database · checked Sep 28, 2026
20	Mahimarkets	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	31 contacts →
	Partial 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
21	Turquoise	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	29 contacts →
	Partial evidence “Turquoise is the European multilateral trading facility majority owned by London Stock Exchange Group in partnership with the user community.” Source: RevenueBase Database · checked Sep 28, 2026
22	Gmex Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Indirect evidence “is a set of companies offering sustainable and innovative solutions for a new era of global financial markets.” Source: RevenueBase Database · checked Sep 28, 2026
23	Silvertide	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Indirect evidence “We’re the leading fintech specializing in buy-side brokerage services.” Source: RevenueBase Database · checked Sep 28, 2026
24	Exberry	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “Exberry is an independent technology vendor specialising in cutting-edge trading technologies for exchanges.” Source: RevenueBase Database · checked Sep 28, 2026
25	Tradair- An ION Group Company	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	20 contacts →
	Partial evidence “TradAir: The nexus of the FX and cryptro trading system.” 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: institutional trading platforms. 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 institutional trading platforms.
Partial evidence: Its own public description names part of institutional trading platforms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name institutional trading platforms. 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 99 institutional trading platforms based in London, United Kingdom

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Institutional trading platforms based in London, United Kingdom at a glance

As of Sep 28, 2026

39.8%Verified-email coverage

35.9Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 99 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 institutional trading platforms, 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 “institutional trading platforms”. 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 institutional trading platforms), 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 institutional trading platforms, 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, 1,414 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 institutional trading platforms, 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 institutional trading platforms are there based in London, United Kingdom?

RevenueBase identified 99 institutional trading platforms 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?

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

Which city in the United Kingdom has the most institutional trading platforms?

London leads the United Kingdom with 99 headquartered companies, followed by Belfast (1) and Eastbourne (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 1,414 verified decision-maker contacts tracked across these 99 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.