Jane Street

Jane Street is a quantitative trading firm and liquidity provider serving institutional clients across ETFs, equities, bonds, options and digital assets. It commits its own capital to trading and helps clients execute transactions and manage risk. Its electronic platforms include JX for access to proprietary US equity liquidity, JX-EU for European and UK equities, and JCX for digital assets, offering round-the-clock trading and daily net settlement.

Established in 2000, Jane Street was founded by Michael Jenkins, Tim Reynolds, Rob Granieri and Marc Gerstein. Granieri remains a central leader without a formal title, within a collective management structure. Its engineering work extends to programming-language development: OxCaml, publicly introduced in 2025, is both its production compiler and an experimental extension of OCaml. It gives programmers control over memory layout and allocation, while type-system additions statically rule out data races in concurrent programs.

As of August 2026, the company reports more than 3,000 employees across five global offices and trading on more than 200 venues in 45 countries. Its client offering at that time spans more than 10,000 ETFs priced and traded globally and more than 25,000 bonds priced. Jane Street reports more than $900 billion in fixed-income trading with clients during 2025, illustrating the transaction scale of its institutional liquidity business.