Jane Street's Bitcoin ETF bet grows back to $1B

Jane Street cut its Bitcoin ETF holdings by 71% at the start of 2026. Three months later, it reversed itself. A filing made public this month shows the trading firm rebuilt its position to nearly $1 billion by June 30. Most of the new buying went into BlackRock's iShares Bitcoin Trust.

Jane Street isn't a typical investor. It's a market maker. That's a firm that trades constantly to keep markets running smoothly. It doesn't hold a stock because it believes in it. That makes this swing less a vote of confidence. It's more a sign of where trading volume and client demand are flowing right now. Still, that's more than a billion dollars moving in and out in six months. That shows how fast institutional Bitcoin bets can move, in either direction.

Keep reading — what to watch

Will Jane Street's next filing show another reversal, or has it settled into holding Bitcoin again? Quarterly filings only show a snapshot every three months. A lot can happen to a trading firm's book in between.