Blackrock IBIT Leads Jane Street's Big Bitcoin ETF Rebound

Quantitative trading firm Jane Street has staged a significant comeback in the U.S. spot Bitcoin ETF market, disclosing more than $1 billion in holdings as of June 30 via its Q2 2026 Form 13F filing with the Securities and Exchange Commission.

IBIT Dominates the Position

Jane Street reported $990 million in Bitcoin exchange-traded funds in its Q2 2026 Form 13F filing with the SEC, an allocation equivalent to 15,394 BTC, with $828 million concentrated in BlackRock's iShares Bitcoin Trust (IBIT). The remainder of the position is spread across Fidelity's Wise Origin Bitcoin Fund and Grayscale's Bitcoin Trust.

BlackRock's IBIT is the largest and most popular of the U.S. spot Bitcoin ETFs, which were approved in early 2024, and the fund currently holds $47.3 billion in assets under management.

A Sharp Reversal After Q1 Cuts

The Q2 rebound is notable given how aggressively Jane Street pulled back just one quarter earlier. According to a Q1 13F filing, the Wall Street trading firm sharply lowered its positions in spot Bitcoin ETFs tied to BlackRock and Fidelity. Its IBIT position dropped about 71% quarter-over-quarter to roughly 5.9 million shares valued near $225 million, while its Fidelity FBTC stake fell about 60% to around 2 million shares worth nearly $115 million.

Jane Street added $630 million worth of Bitcoin ETFs in Q2 2026, pushing its total position to approximately $1.06 billion. For a firm that slashed those same holdings by roughly 71% just one quarter earlier, the reversal is striking. Its IBIT holdings surged back to 24.9 million shares by the end of June.

Analysts caution against reading too much into the headline numbers. A 13F only captures long positions in U.S.-listed securities at a single point in time, the last day of the quarter, and shows nothing about short positions, derivatives, options, or offshore holdings. For a firm like Jane Street, which runs highly complex hedged books, analysts explicitly warn against treating these numbers as a directional portfolio view.

What Jane Street's Q2 position does confirm is that the firm remains deeply embedded in the Bitcoin ETF market and sees enough client demand to warrant a balance sheet commitment well above $1 billion. Jane Street is also one of the ETF market's key authorized participants, meaning its reported holdings can reflect inventory management and client flows as much as any directional conviction trade.

Sources:
Bitcoin Magazine: Jane Street Reveals Nearly $1B Bitcoin Position
Crypto Briefing: Jane Street buys $630M in Bitcoin ETFs, total holdings reach $1B
Crypto News: Jane Street cuts Bitcoin ETF holdings while boosting Ether exposure