Research. Tech. Trading.
We are a global liquidity provider and trading firm, using sophisticated quantitative analysis and a deep understanding of market mechanics to help keep prices consistent and reliable.

At Jane Street our trading blends human intuition—earned through more than twenty years of experience—with cutting-edge research. Our style is both rigorous and pragmatic. Depending on the problem, we might draw on large-scale machine learning models, domain expertise, or pen-and-paper mathematics. We’re a firm of puzzle solvers on and off the clock.

Technology is central to everything we do. Twenty years of using the most advanced tools available and applying them to complex problems at market scale has given Jane Street a reputation for excellence among software engineers.

We build almost all of our software, including our critical trading and risk management systems, in-house using a statically typed functional programming language called OCaml. Although we prize automation, human judgment and insight are critical to how we trade, and so we’ve invested heavily in tools that provide traders with real-time visibility and insight into our trading activity to help guide their decision making.