Jane Street Nearly Octuples Fidelity Bitcoin ETF Stake While Trimming BlackRock IBIT

TL;DR

• Jane Street increased its Fidelity Bitcoin ETF holdings from roughly 887,000 to 7.01 million shares in Q3, taking the position’s value to $509 million.
• Its BlackRock IBIT share count fell 19% to 20.22 million, although the position’s reported value rose to $957 million as the ETF appreciated.
• Jane Street also added ARKB and ETHA exposure, while other institutions reported mixed changes across their Bitcoin ETF positions during the quarter.

Jane Street sharply increased its Fidelity Wise Origin Bitcoin Fund position during the third quarter while reducing its holdings in BlackRock’s iShares Bitcoin Trust. The firm ended September with 7.01 million FBTC shares, up from about 887,000 at the end of June, lifting the position to $509 million. Meanwhile, 13F Pro data provides the prior-quarter baseline for its IBIT exposure. The filings show a major reallocation across Bitcoin ETFs, but they do not reveal Jane Street’s trading intent or activity between quarter-end snapshots.

Jane Street Rotates Between Major Bitcoin ETF Products

Jane Street’s FBTC share count increased by roughly 6.12 million shares, equivalent to nearly eight times its second-quarter position. By contrast, its IBIT holdings fell 19% to 20.22 million shares from 24.88 million. The reported value of the BlackRock position still increased from $828 million to about $957 million because IBIT’s share price rose during the quarter. The contrast shows why share counts matter more than headline dollar values when evaluating quarterly position changes. The shift follows Jane Street’s previously disclosed large institutional Bitcoin ETF exposure at the end of June.

The trading firm also expanded exposure elsewhere in the crypto ETF market. Jane Street added nearly 9 million shares of ARK 21Shares Bitcoin ETF, worth about $249 million at quarter-end, and increased its BlackRock iShares Ethereum Trust holdings by 7.83 million shares, more than doubling that position. The filings therefore point to portfolio rebalancing across issuers and crypto products rather than a simple reduction in digital-asset exposure. Other institutions also adjusted Bitcoin ETF holdings during the quarter, extending a broader pattern of institutional repositioning in IBIT.

JPMorgan Chase increased its IBIT position by 9.6%, adding about 1 million shares to reach 11.41 million, valued near $540 million at September 30. Laurore moved in the opposite direction, cutting its IBIT stake by 33% to 3.25 million shares, worth roughly $154 million. These disclosures are delayed regulatory snapshots, not real-time fund-flow data, and they cannot establish whether institutions maintained the same positions after September 30. The quarter also underscores that large managers can move differently across competing products, making individual 13F positions more useful for tracking portfolio composition than for inferring a unified institutional view on Bitcoin overall. That distinction is important as Bitcoin ETF flows remain volatile and reported ownership can shift substantially between quarterly filings.