Jane Street, one of Wall Street’s most influential quantitative trading firms, dramatically reduced its exposure to Bitcoin exchange-traded funds in the first quarter of 2026, cutting its position in BlackRock’s iShares Bitcoin Trust by 71% while sharply increasing its allocation to Ethereum-linked products.
The shift, revealed in a 13F filing submitted to the US Securities and Exchange Commission, represents one of the most significant rebalancing moves among major institutional players in the crypto ETF space since the products launched in January 2024.
The Numbers
According to the filing, Jane Street held approximately 5.9 million IBIT shares at the end of Q1 2026, valued at roughly $225 million – down from a peak position that had been worth more than $770 million at year-end 2025. The firm also reduced its stake in Fidelity’s Bitcoin ETF (FBTC) by approximately 60% and cut its Grayscale Bitcoin Trust (GBTC) exposure by 86%.
On the Ethereum side, the picture reversed. Jane Street roughly doubled its position in BlackRock’s iShares Ethereum Trust (ETHA) and also added exposure to several spot Ethereum ETF products from other issuers.
The firm also trimmed its stake in Strategy (formerly MicroStrategy) – the Bitcoin proxy equity – by a significant margin after building that position aggressively through late 2025.
Hedging or Rotating?
The natural question is whether Jane Street is souring on Bitcoin or simply rotating within crypto. Analysts who cover institutional positioning are split.
One interpretation is that Jane Street is adjusting its hedging book. The firm is a primary market maker for multiple Bitcoin and Ethereum ETFs, which means it regularly holds offsetting positions as part of its market-making operations. Its reported 13F holdings may reflect hedges unwound or risk reduced as market volatility shifted – not a fundamental bearish call on Bitcoin.
A second reading is more straightforward: Jane Street saw Ethereum as undervalued relative to Bitcoin entering 2026 and is repositioning for a rotation trade. Bitcoin had significantly outperformed Ethereum since mid-2024, creating what some quant shops viewed as a stretched valuation gap.
“When you see a quant firm cut BTC exposure and add ETH simultaneously, that’s usually a convergence trade,” said one derivatives analyst who asked not to be named. “They’re not abandoning crypto – they’re betting the ratio compresses.”
Why This Could Actually Be Bullish for Bitcoin
Some observers have pointed out that Jane Street’s reduction could be interpreted as a constructive signal rather than a bearish one.
As a market maker, Jane Street’s Bitcoin ETF holdings aren’t buy-and-hold bets. The firm provides liquidity, meaning its long ETF positions are typically offset by short futures or other instruments. When it reduces its reported ETF stake, it doesn’t necessarily mean it’s less bullish – it may mean it needed less inventory to serve its market-making function.
Several analysts noted on social media that Q1 2026 saw significant outflows from Bitcoin ETFs as retail investors pulled back amid Bitcoin’s slide to $78,000. A market maker in a lower-volume environment needs to carry less inventory.
“Jane Street cutting IBIT holdings during a period of outflows is exactly what you’d expect from a market maker,” wrote one prominent crypto analyst on X. “This reads as operational, not strategic.”
The Ethereum Signal
what’s harder to explain away on pure market-making grounds is the simultaneous increase in Ethereum positions. That pattern suggests Jane Street has a directional view that Ethereum is likely to close some of its underperformance gap against Bitcoin in the coming months.
Ethereum has struggled to keep pace with Bitcoin through 2025 and into 2026. The upcoming Glamsterdam upgrade – which aims to triple execution capacity – has been cited by multiple analysts as a potential spark that could reignite institutional interest in ETH.
If Jane Street is front-running that trade, the move may look prescient by year end.
What Other Institutions Are Doing
Jane Street’s pivot stands in contrast to Mubadala Investment Company’s steady Bitcoin accumulation and aligns more closely with moves seen at certain hedge funds that have been quietly rotating from Bitcoin to Ethereum since late Q4 2025.
The divergence suggests the institutional crypto market is maturing beyond a simple Bitcoin-first narrative. Sophisticated players are now running spread trades, basis trades, and rotation strategies across the full menu of crypto ETF products – behaviour that looks far more like equity market dynamics than the earlier wave of long-only Bitcoin allocations.
FAQ
Is Jane Street bearish on Bitcoin? Not necessarily. Jane Street is a market maker for Bitcoin ETFs, which means its reported holdings often reflect inventory for liquidity provision rather than directional bets. The reduction in Q1 2026 coincided with lower ETF trading volumes, which would naturally require less market maker inventory.
why’s Jane Street buying more Ethereum? The firm’s Ethereum ETF increase suggests a potential rotation or spread trade between BTC and ETH. With Ethereum underperforming Bitcoin for several quarters, some quantitative firms see a mean reversion opportunity – especially ahead of Ethereum’s Glamsterdam upgrade.
Do 13F filings show all of a firm’s positions? No. 13F filings only report long US equity and US-listed ETF positions above certain thresholds, as of the end of each quarter. They don’t show short positions, futures, options, or positions held outside US-listed securities. Jane Street’s total crypto exposure may look very different from what the 13F reveals.
*Sources: SEC 13F filing, AMBCrypto, NewsBTC, crypto.news, 99bitcoins. Data as of Q1 2026 reporting period.*
