Trading. Research. Tech.

At Jane Street, our work 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, domain expertise, or pen-and-paper mathematics. We’re a firm of puzzle solvers on and off the clock.

At the heart of global markets.

Our global presence allows us to trade continuously on more than 200 electronic exchanges and other venues, making us one of the world’s largest market makers.

Jane Street became known for its expertise in domestic and international ETFs, but our trading has grown significantly since our early days. Today, we are major players in the Equities, Bonds, and Options markets, among others.

Whether it’s in New York, London, Hong Kong, Singapore, or Amsterdam, standing on a Jane Street trading floor feels like being at the center of something much bigger — a lively, cross-continental exchange of ideas.

Drawing on machine learning to advance quantitative research.

Trading serves as a unique, rapid-feedback platform for ML experimentation, allowing us to incorporate new ideas with relatively little friction.

Machine learning has been a key part of Jane Street’s work from the beginning; we’ve leveraged a variety of modeling techniques since our founding in 2000. The depth of our reliance on these models has grown dramatically in the last few years as we’ve adopted ever more sophisticated techniques to improve and inform our trading. Traders and researchers at Jane Street build models, strategies, and systems that price and trade a variety of financial instruments. We analyze large datasets using a variety of machine learning techniques, exploring the latest theory and pushing beyond existing performance limits.

Technical to the core.

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 of technical excellence.

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

Coming together to solve complex problems.

A single trade at Jane Street is the product of many teams and systems working together. The lines between trading, research, and technology are intentionally porous, both at the organizational and individual level.

Trading ideas often depend on a blend of domain expertise, sophisticated mathematics, and large-scale data analysis; staying on top of the market requires fast and highly available systems. Our tightly integrated teams foster open, collaborative environments that make this kind of work possible.

Jane Street has grown every year in its team, capital, and global presence. We continue to safely navigate volatile markets by being willing to take on the most challenging trades and complex problems — by staying persistent, humble, and curious.