Jack in the Box Stock Gains 7% Premarket After Russell Addition Triggers Short Squeeze

According to StockTwits, Jack in the Box Inc. (JACK) stock extended gains in Tuesday premarket trading, building on its biggest one-day rally in over six years on Monday, after the company's inclusion in the Russell index reconstitution triggered significant buying from index-tracking funds. Heavy short interest at more than 33% of the float accelerated the move higher as bearish traders rushed to cover positions, with shares trading up 7% premarket.

The company's $500 million securitized financing transaction last week extended its next major debt repayment to 2029, reducing near-term refinancing concerns that had weighed on the stock through 2026.