# The 26 largest Capital Markets companies in London

Tamtam tracks 26 Capital Markets companies headquartered in London. This list ranks all of them by number of employees on LinkedIn, led by Stock Market, The5ers.com and EXANTE. Their median headcount is 13. Half of them were founded in 2015 or later.

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.

🇬🇧 London · 26 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Stock Market](https://www.tamtam.ai/c/stock-market-london) (gudens.com)<br>An Intel AI Partner offering consulting, development, and deployment services to help companies succeed in the AI economy with innovative solutions | Capital Markets | 🇬🇧 London | 2,563 | 2020 |
| 2 | [The5ers.com](https://www.tamtam.ai/c/the5ers-com) (the5ers.com)<br>Supporting traders with funding and professional guidance, offering skill progression, learning experiences, and a rewarding workspace to enhance trading success | Capital Markets | 🇬🇧 London | 732 | 2015 |
| 3 | [EXANTE](https://www.tamtam.ai/c/exante) (exante.eu)<br>Global prime brokerage providing a proprietary multi-currency trading platform for institutional and individual investors to access two million instruments across fifty markets. | Capital Markets | 🇬🇧 London | 662 | 2011 |
| 4 | [Finalto](https://www.tamtam.ai/c/finalto) (finalto.com)<br>Providing multi-asset liquidity, risk management, and advanced technology solutions to brokers, banks, and businesses for global market access. | Capital Markets | 🇬🇧 London | 213 |  |
| 5 | [Quod Financial](https://www.tamtam.ai/c/quod-financial) (quodfinancial.com)<br>Provides modular, AI-enhanced trading platform integrating OMS, EMS, SOR, algorithmic trading, and liquidity internalization for financial institutions. | Capital Markets | 🇬🇧 London | 190 | 2004 |
| 6 | [AFME (Association for Financial Markets in Europe)](https://www.tamtam.ai/c/afme-association-for-financial-markets-in-europe) (afme.eu)<br>Advocating for integrated European capital markets, AFME supports economic growth by bridging market participants and policymakers on regulatory and capital markets issues | Capital Markets | 🇬🇧 London | 133 | 2009 |
| 7 | [HYCM Global](https://www.tamtam.ai/c/hycm-global) (hycm.com)<br>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 | Capital Markets | 🇬🇧 London | 122 |  |
| 8 | [Guy Butler Limited](https://www.tamtam.ai/c/guy-butler-limited) (guybutler.co.uk)<br>A leading institutional credit specialist offering trading strategies and relative credit ideas in various markets, serving clients globally since 1996 | Capital Markets | 🇬🇧 London | 35 |  |
| 9 | [h2Radnor Limited](https://www.tamtam.ai/c/h2radnor-limited) (h2radnor.com)<br>An advisory firm offering strategic advice, investor communications, research, private equity, ESG advisory, and data-driven investor targeting for private and public companies | Capital Markets | 🇬🇧 London | 17 | 2004 |
| 10 | [FIXI plc](https://www.tamtam.ai/c/fixi-plc) (fixi.com)<br>An independent brokerage house offering global coverage of Forex, Bullion, and CFDs with Tier 1 liquidity, secure funds, tight spreads, and advanced trading technology | Capital Markets | 🇬🇧 London | 17 | 2006 |
| 11 | [UPCC](https://www.tamtam.ai/c/upcc) (upcc.uk)<br>Specializing in providing consultancy services for capital markets, helping clients navigate through financial complexities and optimize investment strategies | Capital Markets | 🇬🇧 London | 16 | 2000 |
| 12 | [Judges Scientific Plc](https://www.tamtam.ai/c/judges-scientific-plc) (judges.uk.com)<br>A London-based capital markets company specializing in scientific equipment geared towards a range of industries | Capital Markets | 🇬🇧 London | 15 |  |
| 13 | [INBOUND CAPITAL](https://www.tamtam.ai/c/inbound-capital) (inbound.capital)<br>FCA regulated capital markets advisory firm providing bespoke solutions, equity story specialization, and strategic investor access for European small and mid-cap companies. | Capital Markets | 🇬🇧 London | 13 | 2015 |
| 14 | [Southey Capital Ltd](https://www.tamtam.ai/c/southey-capital-ltd) (southeycapital.com)<br>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 | Capital Markets | 🇬🇧 London | 10 | 2015 |
| 15 | [Investor Update](https://www.tamtam.ai/c/investor-update) (investor-update.com)<br>Providing actionable shareholding data, investor targeting, ESG analytics, and proxy solicitation to support corporate and investor relations strategies globally. | Capital Markets | 🇬🇧 London | 10 | 2016 |
| 16 | [Armira Capital](https://www.tamtam.ai/c/armira-capital) (armiracapital.com)<br>Boutique global markets and investment advisory firm, providing unbiased solutions with integrity, efficiency, transparency, and expertise in specific markets and asset classes | Capital Markets | 🇬🇧 London | 9 | 2015 |
| 17 | [One Global Market Limited](https://www.tamtam.ai/c/one-global-market-limited) (ogm.market)<br>A globally recognized brokerage with deep understanding of clients, offering access to commodities, FX, and indices through easy-to-use platforms | Capital Markets | 🇬🇧 London | 9 | 2017 |
| 18 | [CERES SECURITIES LIMITED](https://www.tamtam.ai/c/ceres-securities-limited) (ceressecurities.com)<br>A capital markets company located in London, UK, specializing in financial services and investments | Capital Markets | 🇬🇧 London | 7 |  |
| 19 | [ALGO Technologies Ltd](https://www.tamtam.ai/c/algo-technologies-ltd) (algotechnologies.com)<br>Specialist trading technology firm offering high speed solutions including market data service, exchange matching engine, and fiber optic network for low latency trading | Capital Markets | 🇬🇧 London | 6 | 2010 |
| 20 | [Eton Capital](https://www.tamtam.ai/c/eton-capital) (etoncap.com)<br>International Investment & Capital Markets Boutique operating in major financial centers, assisting corporations and investment funds with equity/debt solutions, bond issuance, and IPOs | Capital Markets | 🇬🇧 London | 4 | 2012 |
| 21 | [ASCENTIAL GROUP LIMITED](https://www.tamtam.ai/c/ascential-group-limited)<br>A capital markets company located in London, UK, specializing in financial services and investments | Capital Markets | 🇬🇧 London | 4 |  |
| 22 | [MapleRisk](https://www.tamtam.ai/c/maplerisk)<br>A global team of capital markets practitioners providing trading technology, risk analytics, and digital consultancy services to empower clients in achieving continual improvement | Capital Markets | 🇬🇧 London | 2 | 2012 |
| 23 | [N3 Trading](https://www.tamtam.ai/c/n3-trading) (n3trading.com)<br>A London trading company specializing in discretionary and automated trading in equities, options, and index futures for over 30 professional traders | Capital Markets | 🇬🇧 London | 2 |  |
| 24 | [Triomnia Capital Ltd](https://www.tamtam.ai/c/triomnia-capital-ltd) (triomnia.com)<br>A boutique quant firm specializing in developing advanced trading systems integrating digital signal processing, AI, mathematics, and data science for accurate market prediction | Capital Markets | 🇬🇧 London | 2 | 2018 |
| 25 | [Byte Trading](https://www.tamtam.ai/c/byte-trading) (x.com)<br>Algorithmic market maker specializing in digital assets, providing liquidity and efficiency on both centralized and decentralized exchanges | Capital Markets | 🇬🇧 London | 2 | 2021 |
| 26 | [Paratus Capital](https://www.tamtam.ai/c/paratus-capital) (paratuscapital.com)<br>Proprietary trading firm specializing in research-led strategies to generate profits | Capital Markets | 🇬🇧 London | 1 | 2021 |

## 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](https://www.tamtam.ai/l/largest-companies-london) (12,882)
- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
- [Financial Services companies in London](https://www.tamtam.ai/l/financial-services-companies-london) (1,862)
- [Financial services firms in London](https://www.tamtam.ai/l/financial-services-firms-london) (1,824)
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- [Software Development companies in London](https://www.tamtam.ai/l/software-development-companies-london) (1,217)
- [Retail chains in London](https://www.tamtam.ai/l/retail-chains-london) (942)
- [IT Services and IT Consulting companies in London](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-london) (693)
- [Companies with a mobile app in London](https://www.tamtam.ai/l/companies-with-mobile-app-london) (667)
- [Consulting firms in London](https://www.tamtam.ai/l/consulting-firms-london) (648)
- [IT services companies in London](https://www.tamtam.ai/l/it-services-companies-london) (607)
- [Subscription businesses in London](https://www.tamtam.ai/l/subscription-businesses-london) (544)
- [Venture capital and private equity firms in London](https://www.tamtam.ai/l/vc-and-private-equity-firms-london) (539)
- [Marketing and communications agencies in London](https://www.tamtam.ai/l/marketing-agencies-london) (533)
- [Retail Apparel and Fashion companies in London](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-london) (498)
- [Advertising Services companies in London](https://www.tamtam.ai/l/advertising-services-companies-london) (480)
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- [AI companies in London](https://www.tamtam.ai/l/ai-companies-london) (456)
- [Investment Management companies in London](https://www.tamtam.ai/l/investment-management-companies-london) (452)
- [Hotel and hospitality groups in London](https://www.tamtam.ai/l/hospitality-groups-london) (445)
- [Luxury brands in London](https://www.tamtam.ai/l/luxury-brands-london) (428)
- [AI-native companies in London](https://www.tamtam.ai/l/ai-native-companies-london) (407)
- [E-commerce companies in London](https://www.tamtam.ai/l/ecommerce-companies-london) (384)

## The same list elsewhere in United Kingdom

- [Capital Markets companies in the United Kingdom](https://www.tamtam.ai/l/capital-markets-companies-united-kingdom) (47)

## The same list elsewhere

- [Capital Markets companies in the world](https://www.tamtam.ai/l/capital-markets-companies-in-the-world) (321)
- [Capital Markets companies in Europe](https://www.tamtam.ai/l/capital-markets-companies-in-europe) (135)

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Source: https://www.tamtam.ai/l/capital-markets-companies-london