10 Top Trading Firms in London

These firms employ financial analysts, mathematicians and engineers to drive trading innovation in the U.K. and beyond.

Written by Margo Steines
Published on Sep. 23, 2025
Windows on London high rises reflect the city landscape against the backdrop of a blue sky and clouds.
Photo: Shutterstock
REVIEWED BY
Rose Velazquez | Sep 23, 2025
Summary: London’s financial sector, a historic hub since Roman times, is being shaped by innovative companies like Flow Traders and Clear Street. Its top fintechs are leading advancements in trading infrastructure, liquidity access and data-backed strategies.

London’s history as a trading site goes all the way back to the Roman times, when it served as the port of Londinium. From there, the city became an epicenter of trading activity in the medieval era, then the site of the Royal Exchange starting in the 16th century. Today’s London is a major center for financial services and commodities trading, as well as a global leader in securities and foreign exchange trading and the site of the London Stock Exchange. Read on to learn about some of the companies spearheading financial trading innovation in London.

Trading Companies in London

  • Geneva Trading
  • Hudson River Trading
  • MarketAxess
  • Clear Street
  • Trumid
  • DRW

Related ResourcesTech & Startup Jobs in London

 

Top Trading Companies in London

Geneva Trading is a global proprietary trading company working to provide liquidity across a diverse range of exchanges, asset classes and strategies. Many of the firm’s activities center around markets such as energy, agriculture, foreign exchange, equity, metals and digital assets, and to successfully navigate trading, Geneva relies on algorithmic strategies.

 

GSA is a quantitative investment firm that uses complex mathematics and computer science to enable strategic trading approaches. It specializes in foreign exchange, futures and liquid equity markets, which are notable for high volatility and require agility in investment strategies.

 

Flow Traders is a global firm that aims to improve transparency and efficiency across financial markets. As a liquidity provider and market maker, it’s working to lower overall trading costs. Its trading activities span Europe, the United States and the Asia-Pacific region, and Flow Traders’ footprint includes a London office in Finsbury Square. 

 

Clear Street is a fintech company that offers modern digital infrastructure for the brokerage industry. Its platform is cloud-native and offers tools and services under the institutional, clearing and active trader umbrellas. Founded in 2018, Clear Street has over 650 employees working across various locations, including London.

 

Hudson River Trading is a quantitative trading firm that uses sophisticated mathematical models to develop automated trading protocols. Its team consists of mathematicians, computer scientists and engineers, as well as financial analysts known as “quants,” who together build infrastructure that supports financial market innovation on a global scale.

 

The fintech firm MarketAxess runs a digital trading platform for the global fixed income markets. Its technology supports institutional investors and broker-dealers by enhancing trading efficiency and enabling access to a diverse pool of liquidity, while also fueling cost savings.

 

Proprietary trading firm Akuna Capital serves as an options market maker, aiming to provide liquidity and leverage advanced technologies to enable automation and data-driven decision making. Akuna opened its first office in Chicago in 2011, but has since expanded its operations to sites across Sydney, Shanghai and London. 

 

Trumid operates a platform that’s designed to enhance fixed income trading for institutional investors. The company is proudly trader-first and builds its tools to support streamlined workflows across multiple assets classes and markets. The Trumid platform comes with data analytics capabilities that deliver real-time market insights and other trader intelligence.

 

DRW is a diversified trading firm that has been in operation for nearly 40 years. It focuses on proprietary trading, using its owned capital to transact across various categories and financial products. DRW’s team includes area experts in cryptocurrency, agricultural technology, energy and other distinct areas of investment activity.

 

The fintech company CAIS operates a platform that gives financial advisors, home offices and broker-dealers access to alternative investment assets. It primarily serves independent financial advisors, who are typically working outside of the resource networks of enterprise organizations.

 

This content is for informational and educational purposes only. Built In strives to maintain accuracy in all its editorial coverage, but it is not intended to be a substitute for financial or legal advice.

Explore Job Matches.