Jane Street Bitcoin ETF (BTC) Cut 71%, $82M Into Ethereum ETFs

Jane Street Bitcoin ETF holdings fell sharply in the first quarter of 2026, as the firm cut its stake in BlackRock’s iShares Bitcoin Trust by roughly 71% while redirecting capital into Ethereum-based funds. The quantitative trading firm’s 13F filing for the period ending March 31, 2026 shows a clear rotation between the two largest crypto assets, even as its broader crypto book stayed active across exchanges, mining stocks, and derivatives.

How Jane Street Bitcoin ETF Positions Fell in Q1 2026

The headline number is hard to ignore. Jane Street’s stake in BlackRock’s iShares Bitcoin Trust (IBIT) fell to approximately 5.9 million shares, valued at around $225 million at the time of filing. That represents a cut of roughly 71% compared to the prior quarter, making it one of the sharpest single-quarter reductions in IBIT exposure by any major institutional player this year.

The firm also trimmed its position in Fidelity’s Wise Origin Bitcoin Fund (FBTC) by approximately 60%. Together, the two cuts represent a significant pullback from the spot Bitcoin ETF products that dominated institutional crypto headlines throughout 2024 and early 2025. Bitcoin was trading below $80,000 at several points during the quarter, which may have played into the timing of these moves.

Jane Street also reduced its MicroStrategy (MSTR) position by approximately 78%. MicroStrategy, which holds Bitcoin as its primary corporate treasury asset, tends to trade with amplified sensitivity to Bitcoin price swings. Cutting MSTR alongside the BTC ETF positions suggests the firm was broadly reducing its directional Bitcoin exposure, at least on the long equity side of the ledger.

What the 13F does not show is equally important. These filings capture long equity and options positions only. Jane Street IBIT position cut 71 percent Q1 2026, the firm’s short positions, futures contracts, swaps, and over-the-counter derivatives are entirely absent from the public disclosure. Jane Street runs delta-neutral strategies across every asset class it touches, which means any reduction in a long ETF position could be offset by a corresponding short elsewhere that never shows up in a regulatory filing.

Where Did Jane Street Move the $82 Million?

While Bitcoin ETF positions were shrinking, Ethereum ETF positions were growing. Jane Street nearly doubled its holdings in BlackRock’s iShares Ethereum Trust (ETHA) and added meaningfully to Fidelity’s Ethereum Fund (FETH). The combined additions across the two Ethereum products totaled around $82 million in Q1 2026, according to the 13F data.

For the Ethereum ETF market, this is a meaningful data point. Jane Street ETHA BlackRock Ethereum ETF doubled 2026, since their launch, ETH ETFs have consistently lagged their Bitcoin counterparts in net inflows. The gap in institutional adoption between the two products has been wide. Jane Street’s name appearing on the growth side of the ETH ETF ledger could prompt other institutional allocators to revisit their own exposure.

Beyond the ETF rotation, Jane Street also increased its stake in Galaxy Digital to 1.5 million shares and boosted positions in both Riot Platforms and Coinbase. Those three additions point to a firm that isn’t retreating from crypto broadly, it’s just repositioning within it. Galaxy Digital offers broad crypto exposure with a stronger Ethereum bent, and Coinbase stands to benefit from increased trading volume in either asset.

What Does the 13F Filing Actually Tell Us?

The short answer: less than most headlines suggest. A 13F is a snapshot. It shows what a firm held in long equity and listed options positions as of a specific date. It does not show how those positions were built, at what prices, or how they are hedged.

Jane Street is not a typical buy-and-hold investor. It is a market maker and quantitative trading firm that handles enormous volumes across equities, ETFs, bonds, and derivatives. The firm reported record trading revenue of $16.1 billion for Q1 2026, more than double its take from the same period the year before. That figure underscores the scale at which Jane Street operates and why its reported ETF positions should be understood as one piece of a much larger, multidimensional trade book.

The firm is known for running delta-neutral strategies between BTC and ETH derivatives. In that context, the ETF position changes disclosed in the 13F may represent just one leg of a hedged trade that spans futures, perpetual swaps, and options. The invisible hedge on the other side is what determines whether these moves represent genuine bullish conviction on Ethereum or simply a recalibration of an ongoing arbitrage.

This distinction matters enormously for how retail investors read these signals. Copying the visible leg of a delta-neutral strategy without the offsetting hedge is a dangerous game. The 13F shows where the long equity risk sat on one specific day, not where the net exposure actually pointed.

Does Jane Street’s Ethereum Rotation Signal a Real Institutional Shift?

That is the question the crypto market is asking. And it deserves a careful answer rather than a reflexive yes.

On one reading, the data is genuinely positive for Ethereum. Jane Street is not a retail speculator. It is one of the most sophisticated trading operations in the world, with deep market knowledge and access to data that most investors never see. When a firm of that caliber increases its Ethereum ETF exposure by $82 million in a single quarter, it is at minimum worth paying attention to.

On the other reading, the rotation could be entirely mechanical. If Jane Street’s derivatives desk identified a pricing inefficiency between BTC and ETH derivatives, adjusting the ETF legs of the trade to stay delta-neutral would produce exactly the pattern we see in the 13F, a BTC ETF reduction paired with an ETH ETF increase, with no net directional bet on either asset. The filing would look like a big Ethereum endorsement. The actual trade might be something much more boring.

The honest position is that we cannot know which interpretation is correct from a 13F alone. What we can say is that Ethereum ETFs are attracting more institutional attention in 2026 than they did in 2025, and Jane Street’s filing adds to that picture. Whether that attention translates into sustained net inflows and price appreciation for ETH depends on factors well beyond what any single quarterly filing can reveal.

For now, the most defensible read is this: a major institutional player rotated visibly from Bitcoin ETF products toward Ethereum ETF products in Q1 2026, while keeping its broader crypto exposure intact through equity stakes in Galaxy Digital, Coinbase, and Riot Platforms. That is what the data shows. Everything else is interpretation.

This article is for informational purposes only and does not constitute investment advice. Every investment and trading decision involves risk. Readers should conduct their own research before making any financial decisions.