Jane Street Group Increases Stake in Blackrock s Bitcoin Trust

Jane Street Group significantly boosted its investment in Blackrock s iShares Bitcoin Trust IBIT during the fourth quarter of 2025, acquiring an additional 7,105,206 shares. This move raised the firm s total IBIT holdings to 20,315,780 shares, marking a 54 increase from the previous quarter and valuing its position at over 1 billion by year-end.
The details were revealed in Jane Street s Form 13F-HR for the period ending December 31, 2025. At IBIT s closing price of 49.65 per share on that date, the firm s stake was worth approximately 1.01 billion. However, by mid-February 2026, IBIT s price had dropped to 38.39, reducing the estimated value of Jane Street s position to around 790 million.
Founded in 2000 and based in New York, Jane Street is a global proprietary trading firm known for its quantitative strategies and market-making activities. It operates across more than 200 venues in 45 countries and provides liquidity in various asset classes, including equities, fixed income, ETFs, options, and digital assets.
Quants treat markets like a giant video-game scoreboard: every tick, every volume spike, every correlation is just another stat to leverage.
Jane Street is an authorized participant for IBIT, allowing it to create or redeem ETF shares directly with Blackrock in exchange for underlying bitcoin. This role enables the firm to arbitrage price discrepancies between the ETF and its net asset value, helping to maintain alignment between share prices and the underlying asset.