Jane Street Capital

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Jane Street Capital
IndustryETF trading
FoundedAugust 31, 1999; 19 years ago (1999-08-31)[1]
Number of employees
Websitewww.janestreet.com Edit this on Wikidata

Jane Street Capital, typically referred to as Jane Street, is a global proprietary trading firm,[2] with around 750 employees.[3]


Jane Street was co-founded by Tim Reynolds and three others.[4]Jane Street's website claims the firm was founded in 2000.[2] However, Reynolds reports it to have been founded in 1999.[5] Bloomberg variously gives the founding date as 1999[6] or 2000.[4] The Delaware Department of State: Division of Corporations gives the incorporation date as 31 August 1999.[1]


Jane Street is, as of 2014, one of only a few hundred businesses (across all sectors) that use the OCaml programming language.[7] It adopted OCaml as its main programming language early on because the language's functional programming style and clear expressiveness made it possible for code reviews to be performed by traders who were not programmers, to verify that high-performance code would do what it was intended to do. Jane Street has stated OCaml's advantages thus: “OCaml helps us to quickly adapt to changing market conditions, and go from prototypes to production systems with less effort”.[7] Furthermore, OCaml's "rigor is like catnip to some people,... giving Jane Street an unusual advantage in the tight hiring market for programmers" that allows Jane Street to "lure a steady supply of high-quality candidates".[8]

Jane Street has released some open source code on GitHub that includes their versions of standard OCaml libraries.[9]


A number of people involved with the effective altruism movement have recommended Jane Street Capital as a place to work at for people considering earning to give, and some of the full-time employees as well as interns have been from the effective altruist community.[10][11][12][13][14] In September 2012, Tim Reynolds, one of Jane Street's co-founders, stepped down from the job to redirect his energies towards the philanthropic pursuit of teaching poor students to master photorealistic painting.[15]

There is also a culture of "competitive intelligence", and sometimes employees play bughouse chess on breaks.[8]

Since 2013, Jane Street Capital has held the "Jane Street Women in STEM" event at their New York City headquarters each summer for women between their senior year in high school and their first year in college.[16]


  1. ^ a b https://opencorporates.com/companies/us_de/3091466
  2. ^ a b "Our Story". Jane Street Capital. Retrieved August 1, 2014.
  3. ^ "What We Do :: Jane Street". www.janestreet.com. Retrieved 2018-08-08.
  4. ^ a b https://www.bloomberg.com/news/articles/2012-11-09/jane-street-s-reynolds-turns-to-art-with-trading-fortune
  5. ^ https://www.linkedin.com/in/tim-reynolds-045b6a40
  6. ^ https://www.bloomberg.com/research/stocks/private/snapshot.asp?privcapId=26839078
  7. ^ a b "Companies using OCaml". OCaml.org. Retrieved 17 August 2014.
  8. ^ a b James Somers (April 2, 2015). "Toolkits for the Mind". MIT Technology Review.
  9. ^ "Open Source @ Jane Street". Jane Street Capital. Retrieved August 1, 2014.
  10. ^ MacAskill, William (February 27, 2013). "To save the world, don't get a job at a charity; go work on Wall Street". The Effective Altruism Forum. Retrieved September 30, 2014.
  11. ^ Kuhn, Ben. "My current plans". Retrieved September 30, 2014.
  12. ^ "EA ventures". Retrieved November 24, 2015.
  13. ^ "Trading in quantitative hedge funds". Retrieved November 24, 2015.
  14. ^ Ravenscroft, Alice (July 9, 2014). "Is Effective Altruism Set to Grow?". Retrieved September 30, 2014.
  15. ^ Faux, Zeke (November 9, 2012). "Jane Street's Reynolds Turns to Art With Trading Fortune". Bloomberg.com.
  16. ^ "Jane Street Women in STEM 2014". Retrieved July 11, 2017.

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