Jane Street

Jane Street is a New York-based quantitative trading firm and Major participant in the $2bn Nscale fundraise, the record European AI venture round. Founded in 2000, Jane Street operates as a market maker across equities, bonds, ETFs, options, and cryptocurrencies globally, and is one of the most profitable trading firms in the world on a per-employee basis. Its involvement in the Nscale round mirrors that of fellow quant firm Citadel: securing access to AI infrastructure that feeds its own trading operations.

Jane Street is unusual among financial firms in being almost entirely private, profitable without external capital, and run as a partnership with an emphasis on mathematical rigour. The firm uses functional programming, particularly OCaml, at the core of its trading infrastructure, giving it a software engineering culture closer to a technology company than a traditional bank. It publishes technical blog posts and runs an influential internship programme that serves as a talent pipeline for the quantitative finance industry.

For Nscale, having Jane Street as an investor carries credibility in both technology and financial services. Jane Streets investment thesis in AI compute is consistent with its broader appetite for infrastructure that supports large-scale computational work. The UK and European technology ecosystem benefits from having credible US quant capital entering the sovereign compute space rather than directing Nscale financing exclusively towards US-based data centres.