These London-based capital markets firms include large, established companies and younger firms, mostly founded in the 2000s and 2010s. Stock Market, founded in 2020, is an Intel AI Partner offering consulting and deployment services. EXANTE provides a multi-currency trading platform, while Quod Financial offers a modular, AI-enhanced trading platform. AFME advocates for integrated European capital markets, and HYCM Global provides online FX and CFD trading services.
The companies primarily focus on financial technology, trading platforms, and advisory services. They serve a diverse clientele, from institutional and individual investors to brokers, banks, and corporations, with solutions ranging from liquidity provision and risk management to strategic advice and investor relations.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Stock Marketgudens.com
An Intel AI Partner offering consulting, development, and deployment services to help companies succeed in the AI economy with innovative solutions |
2,563 | |||
| 2 |
The5ers.comthe5ers.com
Supporting traders with funding and professional guidance, offering skill progression, learning experiences, and a rewarding workspace to enhance trading success |
732 | |||
| 3 | 662 | ||||
| 4 |
Finaltofinalto.com
Providing multi-asset liquidity, risk management, and advanced technology solutions to brokers, banks, and businesses for global market access. |
213 | |||
| 5 |
Quod Financialquodfinancial.com
Provides modular, AI-enhanced trading platform integrating OMS, EMS, SOR, algorithmic trading, and liquidity internalization for financial institutions. |
190 | |||
| 6 |
AFME (Association for Financial Markets in Europe)afme.eu
Advocating for integrated European capital markets, AFME supports economic growth by bridging market participants and policymakers on regulatory and capital markets issues |
133 | |||
| 7 |
HYCM Globalhycm.com
A multi-regulated group providing online FX and CFD trading services to retail and institutional investors with a strong focus on client satisfaction and technical development |
122 | |||
| 8 |
Guy Butler Limitedguybutler.co.uk
A leading institutional credit specialist offering trading strategies and relative credit ideas in various markets, serving clients globally since 1996 |
35 | |||
| 9 |
h2Radnor Limitedh2radnor.com
An advisory firm offering strategic advice, investor communications, research, private equity, ESG advisory, and data-driven investor targeting for private and public companies |
17 | |||
| 10 | 17 | ||||
| 11 | 16 | ||||
| 12 |
Judges Scientific Plcjudges.uk.com
A London-based capital markets company specializing in scientific equipment geared towards a range of industries |
15 | |||
| 13 |
INBOUND CAPITALinbound.capital
FCA regulated capital markets advisory firm providing bespoke solutions, equity story specialization, and strategic investor access for European small and mid-cap companies. |
13 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 14 |
Southey Capital Ltdsoutheycapital.com
London based boutique firm specializing in distressed and illiquid securities Offers tailor-made solutions to holders, with a focus on relationship-driven trading and market commentary |
10 | |||
| 15 |
Investor Updateinvestor-update.com
Providing actionable shareholding data, investor targeting, ESG analytics, and proxy solicitation to support corporate and investor relations strategies globally. |
10 | |||
| 16 |
Armira Capitalarmiracapital.com
Boutique global markets and investment advisory firm, providing unbiased solutions with integrity, efficiency, transparency, and expertise in specific markets and asset classes |
9 | |||
| 17 |
One Global Market Limitedogm.market
A globally recognized brokerage with deep understanding of clients, offering access to commodities, FX, and indices through easy-to-use platforms |
9 | |||
| 18 |
CERES SECURITIES LIMITEDceressecurities.com
A capital markets company located in London, UK, specializing in financial services and investments |
7 | |||
| 19 |
ALGO Technologies Ltdalgotechnologies.com
Specialist trading technology firm offering high speed solutions including market data service, exchange matching engine, and fiber optic network for low latency trading |
6 | |||
| 20 |
Eton Capitaletoncap.com
International Investment & Capital Markets Boutique operating in major financial centers, assisting corporations and investment funds with equity/debt solutions, bond issuance, and IPOs |
4 | |||
| 21 | 
ASCENTIAL GROUP LIMITED
A capital markets company located in London, UK, specializing in financial services and investments |
4 | |||
| 22 |
MapleRisk
A global team of capital markets practitioners providing trading technology, risk analytics, and digital consultancy services to empower clients in achieving continual improvement |
2 | |||
| 23 |
N3 Tradingn3trading.com
A London trading company specializing in discretionary and automated trading in equities, options, and index futures for over 30 professional traders |
2 | |||
| 24 |
Triomnia Capital Ltdtriomnia.com
A boutique quant firm specializing in developing advanced trading systems integrating digital signal processing, AI, mathematics, and data science for accurate market prediction |
2 | |||
| 25 |
Byte Tradingx.com
Algorithmic market maker specializing in digital assets, providing liquidity and efficiency on both centralized and decentralized exchanges |
2 | |||
| 26 |
Paratus Capitalparatuscapital.com
Proprietary trading firm specializing in research-led strategies to generate profits |
1 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 14, 2026.
More company lists in London
- The largest companies in London 12,882
- Multinational companies in London 3,652
- Financial Services companies in London 1,862
- Financial services firms in London 1,824
- SaaS companies in London 1,615
- Professional services firms in London 1,248
- Software Development companies in London 1,217
- Retail chains in London 942
- IT Services and IT Consulting companies in London 693
- Companies with a mobile app in London 667
- Consulting firms in London 648
- IT services companies in London 607
- Subscription businesses in London 544
- Venture capital and private equity firms in London 539
- Marketing and communications agencies in London 533
- Retail Apparel and Fashion companies in London 498
- Advertising Services companies in London 480
- Companies with in-house R&D in London 477
- AI companies in London 456
- Investment Management companies in London 452
- Hotel and hospitality groups in London 445
- Luxury brands in London 428
- AI-native companies in London 407
- E-commerce companies in London 384