Jane Street, the quantitative trading firm that most people outside finance have never heard of, now holds a $20 billion portfolio of private companies.
Jane Street reported $39.6 billion in trading revenue for 2025, a figure that surpassed JPMorgan’s trading desk. Q1 2026 trading revenue hit $16.1 billion, more than doubling the same quarter a year earlier. The firm’s estimated net income sits around $10 billion.
One of the most notable positions in that portfolio is a stake in Anthropic, the AI company behind the Claude family of models. Jane Street picked up that position in 2024 from the FTX estate.
From market maker to private market heavyweight
Jane Street’s roots are in market making and quantitative trading. The firm built its reputation by providing liquidity across ETFs, bonds, and other instruments.
