Jane Street Capital

Technology

Jane Street uses OCaml for its operations, contributing to open-source libraries, including an open-source OCaml compiler.[13] Jane Street’s use of OCaml has been paired with increased operational reliance on Python for machine learning.[14]

Exchange-traded funds

In 2024, Jane Street accounted for 41% of the bond ETF trading volume. It held 24% of the primary US-listed ETFs, 16% in the non-primary market US-listed ETFs, and 17% of secondary market activity in Europe. [18]

Commodities

In 2022, Jane Street held an $8.1 million position on commodities, increasing to $16.6 million in 2023. In Jane Street’s 2024 bond docs, they did not publicly state their intent to expand into commodities.[6]

Fixed income

In 2024, Jane Street averaged $230 billion in monthly fixed income trading volume. [19]

Options

In 2024, Jane Street was responsible for around 8% of Options Clearing Corporation's transactions. [19]

Retail flow

In August 2025, Jane Street handled the second most non S&P 500 orders and third most S&P 500 for Robinhood Markets. Jane Street paid $61.3 million for stock flow and $15.2 million for derivatives to Robinhood Markets as a fee to control order flow.[20]

London Metal Exchange lawsuit

In June 2022, Jane Street and Elliott Investment Management sued the London Metal Exchange for cancelling US$4 billion in nickel trades during a period of high volatility.[21] The case was dismissed by the High Court of Justice in November 2023,[22] and an appeal to the dismissal was rejected in October 2024.[23] The Financial Conduct Authority later fined the London Metal Exchange in March 2025 for mishandling the excessive volatility.[24]

Millennium Management lawsuit

Jane Street filed suit against two former Jane Street employees at Millennium Management, accusing them of stealing trade secrets, primarily of its Indian market operations.[5][25] The suit was settled in December 2024 for an undisclosed amount.[25]

Indian market manipulation allegations

In July 2025, the Securities and Exchange Board of India (SEBI) alleged that Jane Street used multiple entities for market manipulation and barred it from accessing the market.[26][27][28] On July 14th, 2025, Jane Street put $560 million into an escrow account as part of a request to the Securities Appellate Tribunal (SAT) to resume trading activities.[29]

SEBI alleged that Jane Street used one entity to acquire substantial quantities of bank stocks at market open, increasing the value of the Bank Nifty index, while a separate entity simultaneously held derivatives that would benefit from a later decline in that index. Near the expiry of the derivatives, the bank stocks were allegedly sold by Jane Street, causing a decline in the Bank Nifty and generating profits from the derivatives.[30][31] Jane Street denied all wrongdoing, stating it was basic index arbitrage.[29]

On July 21, 2025, SEBI lifted the trading ban placed on Jane Street.[32] In September 2025, Jane Street filed an appeal to request more documents related to a continued investigation by SAT, which was later denied in November 2025.[33]

Connections to South Sudan coup attempt

Jane Street faced scrutiny in June 2025 over its co-founder, Robert Granieri, facing allegations of funding an attempted coup against the government of South Sudan by Peter Ajak and Abraham Keech.[34][35] The matter was resolved with no charges being brought against Granieri.