# Jane Street

Jane Street is an Asset Manager based in New York, United States.

## Overview

- **Organization type:** Asset Manager
- **Headquarters:** New York, United States
- **Region:** Europe
- **Address:** New York, NY, United States
- **Founded:** 2000
- **Assets under management:** >$100B in gross assets (Altss estimate)
- **Website:** janestreet.com
- **LinkedIn:** https://www.linkedin.com/company/janestreetgroup

## Regulatory record

- **Reports private funds:** No

## About

Jane Street Group is a quantitative trading firm and liquidity provider. It engages in trading and market making, using machine learning and technology. Founded in 2000, the company is based in New York, New York.

## Sectors

- Quantitative Trading
- Market Making
- Proprietary Trading

## Offices

- London, United Kingdom
- Hong Kong
- Singapore
- Amsterdam, Netherlands

## People

- Rob Granieri — Chief Executive Officer
- Brad Katsuyama — former Global Head of Trading (left 2012)

## Questions

### How does Jane Street make money?

Jane Street operates as a principal market-maker — it continuously quotes buy and sell prices on exchanges and trading venues worldwide, earning the bid-ask spread. The firm takes no client money and runs no asset-management business. Revenue is exclusively from proprietary trading across equities, ETFs, bonds, currencies, options, and crypto.

### What role did Jane Street play in the rise of IEX and 'Flash Boys'?

Brad Katsuyama, a former Global Head of Trading at Jane Street, left the firm in 2012 after growing frustrated with latency advantages sold by exchanges to high-frequency traders. He co-founded IEX — the Investors' Exchange — and a related software company, which were the subject of Michael Lewis's 2014 book 'Flash Boys.' Jane Street itself was portrayed as one of the sophisticated market-makers whose technology IEX sought to neutralize.

### Does Jane Street manage outside capital or operate funds?

No. Jane Street trades exclusively proprietary capital belonging to the firm's partners and employees. It does not solicit, accept, or manage outside investor funds, which distinguishes it from hedge funds, asset managers, and family offices.

### What is Jane Street's connection to the OCaml programming language?

Jane Street is the most significant corporate user and steward of OCaml, a functional programming language. The firm built its entire trading infrastructure on OCaml, sponsors academic conferences, employs core compiler developers, and open-sources substantial libraries. This gives the firm an unusual talent pipeline from computer science departments and creates a technical culture barrier that competitors find difficult to replicate.

### How large is Jane Street's ETF market-making business?

Jane Street is widely reported to handle roughly 12–14% of all US-listed ETF trading volume, making it the largest ETF market-maker globally. In notional terms, the firm trades over $17 billion in ETFs daily, according to a Bloomberg analysis in 2024. It is an authorized participant for most major ETF issuers.

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Last updated: 2026-06-03T20:00:00.000Z

Canonical page: https://altss.com/profile/jane-street-group

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