# Jane Street — The Combinator as Craft

**Canonical URL:** https://stratcraft.ai/alpha-factory/jane-street-craft

## Case Study: Jane Street

**Verdict:** Lived (2000 → present)

**Thesis:** Jane Street never sold signals. It built a quoting engine — a combinator that fuses cross-asset pricing reads into one quote per instrument. Same architectural pattern as Medallion, different shape.

## Key Facts

- Founded: 2000
- Founders: Tim Reynolds, Rob Granieri, Marc Gerstein
- Tech lead: Yaron Minsky (drove the OCaml decision)
- Net trading revenue (2023): $14.2B
- Employees: ~3,000
- Key insight: When a customer trades an ETF, the system instantly re-quotes the underlying bonds, the swaps that hedge them, and the index futures. Every leg is a function of every other leg, continuously.

## Architecture Pattern

Jane Street's combinator is a cross-asset quoting engine. It fuses pricing reads from bonds, ETFs, swaps, and futures into one quote per instrument. The moat is not any individual pricing model — it is the latency between a customer trade arriving and every related quote updating to reflect it.

## Brand

- Product: StratCraft
- URL: https://stratcraft.ai
- This page: dark standalone design (case study layout, "lived" variant)