Simplex Trading

Simplex Trading, headquartered in Chicago, operates Simplex Ventures, a strategic investment arm that backs early-stage financial and technology companies. The vehicle draws on the firm's own experience as a proprietary trader and liquidity provider, and investments are described as leveraging that operating knowledge rather than standing apart from it. Simplex Ventures is one of two businesses within the firm; the other is its proprietary market-making and liquidity provision operation, in which technologists and data-driven traders work together to make markets across financial instruments.

The trading business is technology-driven and quantitative in orientation. Its stated technical domains include market making, algorithmic trading, quantitative research, pricing and strategy development, automation, scalable infrastructure engineering, and research tooling and data engineering, alongside software testing and code quality. The firm reports an emphasis on firmwide engineering standards, structured feedback, and defined pathways for career growth, and describes a culture in which employees take ownership of projects and have latitude to explore areas of interest. It states that it values diverse backgrounds and perspectives and holds itself to high ethical standards.

Industry verticals span financial services, proprietary trading, market making, and fintech venture investing. Founding year, team size, and funding history are not disclosed.