Jane Street materially reduced its holdings in major Bitcoin exchange-traded funds and MicroStrategy during the first quarter of 2026, while increasing exposure to Ethereum-linked ETFs. The reallocation shifted roughly $300 million away from Bitcoin vehicles and into Ether products, marking a notable portfolio adjustment by one of the market’s most important liquidity providers.
Jane Street’s positions can influence ETF market structure even when they do not represent a simple directional view. As a major market maker, its quarter-end holdings can affect arbitrage flows, spreads and liquidity conditions across crypto-linked investment products.
In Q4 of 2025, Jane Street increased their $MSTR position by 473%. What could they possibly be doing adding nearly 800,000 shares of MicroStrategy stock while the price went down -53%.
They were shorting the living shit out of it. pic.twitter.com/M01FQxW0ho
— The ₿itcoin Therapist (@TheBTCTherapist) February 26, 2026
Bitcoin Vehicles See Sharp Reductions
The firm cut its position in BlackRock’s iShares Bitcoin Trust by about 71%, leaving it with roughly 5.9 million shares valued at approximately $225 million. It also reduced its Fidelity Wise Origin Bitcoin Fund stake by about 60%, ending the quarter with roughly 2 million shares worth nearly $115 million.
Jane Street also scaled back its MicroStrategy exposure, reducing the position by about 78% from roughly 968,000 shares to around 210,000 shares. That left its MSTR holding valued near $27 million, sharply lowering exposure to one of the market’s most prominent equity proxies for Bitcoin.
At the same time, the firm increased its Ethereum ETF allocation. Jane Street nearly doubled its position in BlackRock’s iShares Ethereum Trust and added to Fidelity’s Ether ETF, with combined Ethereum-linked ETF additions of about $82 million.
ETF Flows May Reflect Market-Making Strategy
The filings should be read carefully. A 13F report captures long positions at quarter-end, but it does not show derivatives, short positions or intraday trading activity, which are essential to understanding a market maker’s complete risk book.
That means the reallocation may reflect hedging, arbitrage inventory or liquidity-provision adjustments rather than a straightforward bullish call on Ether over Bitcoin. Still, the shift can influence ETF spreads and authorized-participant flows because Jane Street is active in the mechanics that keep ETF prices aligned with underlying assets.
Reduced Bitcoin ETF inventory could affect certain ETF tranches, while larger Ether ETF exposure may support tighter execution conditions in ETH-linked products if demand continues.
The rotation may alter cash-and-carry and basis opportunities across BTC and ETH vehicles. A reweighted inventory base can change how capital moves between spot exposure, ETF shares and hedged market-making strategies.
Jane Street also reported a record quarter of trading revenue in Q1 2026, suggesting the changes occurred during heavy market activity. That context supports a risk-management interpretation of the portfolio shift, rather than a purely thematic move away from Bitcoin.
If the pattern persists, Jane Street’s rotation could indicate a broader institutional reassessment of relative demand between Bitcoin and Ethereum investment products.
