Key Takeaways
- • Jane Street reduced Bitcoin ETF holdings by 71% in Q1 2026, cutting iShares Bitcoin Trust (IBIT) from 20.3 million shares (Q4 2025) to 5.9 million shares valued at approximately $225 million, and Fidelity Wise Origin Bitcoin Fund (FBTC) by 60% to 2 million shares worth roughly $115 million.
- • The firm simultaneously increased Ether ETF exposure by nearly doubling its position in BlackRock's iShares Ethereum Trust (ETHA) and sharply raising stakes in Fidelity Ethereum Fund (FETH), adding approximately $82 million combined across both products during the quarter.
- • Jane Street's Michael Saylor-led Strategy (MSTR) holdings collapsed 78% quarter-over-quarter, falling from 968,000 shares valued at $145.9 million in Q4 2025 to 210,000 shares worth roughly $27 million, reversing a 473% position increase from the prior quarter.
- • The reallocation signals a potential institutional rotation from Bitcoin to Ethereum ETFs, with the market maker's 13F filing disclosing only reportable positions and not reflecting the full trading book or net crypto exposure.
Summary
Jane Street, the major Wall Street market maker, executed a significant repositioning of its cryptocurrency-linked holdings in the first quarter of 2026, slashing Bitcoin ETF exposure while aggressively increasing positions in Ethereum funds. According to a 13F filing published in May 2026, the firm cut its stake in BlackRock's iShares Bitcoin Trust (IBIT) by approximately 71%, reducing holdings to 5.9 million shares valued at roughly $225 million, down from 20.3 million shares in the prior quarter. Simultaneously, Fidelity Wise Origin Bitcoin Fund (FBTC) positions declined 60% to approximately 2 million shares worth $115 million.
Concurrent with Bitcoin ETF reductions, Jane Street nearly doubled its position in BlackRock's iShares Ethereum Trust (ETHA) while sharply increasing exposure to Fidelity Ethereum Fund (FETH), collectively adding approximately $82 million across the two products during Q1 2026. This reallocation aligns with early signs of broader institutional Ether ETF buying observed in early 2026, including increased exposure reported at Wells Fargo, suggesting a meaningful shift in institutional capital allocation between the two largest cryptocurrency assets.
The market maker's directional shift extended to related equities. Jane Street's stake in Michael Saylor's Strategy Inc. (MSTR)—a Bitcoin proxy vehicle—collapsed 78% quarter-over-quarter, plummeting from 968,000 shares valued at $145.9 million in Q4 2025 to 210,000 shares worth approximately $27 million. This dramatic reversal followed a 473% position increase in Q4 2025, indicating tactical profit-taking and repositioning after substantial prior-quarter accumulation.
The timing of these moves in Q1 2026 reflects Jane Street's responsiveness to market dynamics and emerging institutional flows. However, the 13F disclosure framework presents important analytical limitations: it captures only reportable equity and ETF positions above specified thresholds and does not reflect the market maker's full derivatives exposure, options positioning, or net cryptocurrency market exposure. Consequently, while the filing reveals significant tactical reallocation toward Ethereum, it provides an incomplete picture of Jane Street's total crypto market stance.
Concurrent with Bitcoin ETF reductions, Jane Street nearly doubled its position in BlackRock's iShares Ethereum Trust (ETHA) while sharply increasing exposure to Fidelity Ethereum Fund (FETH), collectively adding approximately $82 million across the two products during Q1 2026. This reallocation aligns with early signs of broader institutional Ether ETF buying observed in early 2026, including increased exposure reported at Wells Fargo, suggesting a meaningful shift in institutional capital allocation between the two largest cryptocurrency assets.
The market maker's directional shift extended to related equities. Jane Street's stake in Michael Saylor's Strategy Inc. (MSTR)—a Bitcoin proxy vehicle—collapsed 78% quarter-over-quarter, plummeting from 968,000 shares valued at $145.9 million in Q4 2025 to 210,000 shares worth approximately $27 million. This dramatic reversal followed a 473% position increase in Q4 2025, indicating tactical profit-taking and repositioning after substantial prior-quarter accumulation.
The timing of these moves in Q1 2026 reflects Jane Street's responsiveness to market dynamics and emerging institutional flows. However, the 13F disclosure framework presents important analytical limitations: it captures only reportable equity and ETF positions above specified thresholds and does not reflect the market maker's full derivatives exposure, options positioning, or net cryptocurrency market exposure. Consequently, while the filing reveals significant tactical reallocation toward Ethereum, it provides an incomplete picture of Jane Street's total crypto market stance.
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