Bears Pile Into AI Chip Stock, Rental Cars

Short sellers made their biggest move of the week into CBRS. Cerebras Systems saw its short interest jump nearly 20 percentage points in just seven days — from 6.3% to 25.6% of free float. That's one of the sharpest single-week rises in the US market right now.

GRND also caught fresh attention from bears. Grindr's SI % of free float doubled in a week, rising from 12% to 22.2%. Social chatter around the stock has picked up alongside the short build.

The rental car trade remains one of the most crowded bets on Wall Street. CAR (Avis Budget) sits at 45.8% SI % of FF. HTZ (Hertz) is close behind at 44.5%. Both names added over 4 percentage points this week. Bears see ongoing EV fleet writedowns and weak demand as headwinds.

BIRK (Birkenstock) is another notable mover. Short interest climbed from 21.9% to 30.2% — an 8-point jump. The CTB rate stands at 16.7%, the highest among this week's movers. That signals borrowing demand is intense.

Meanwhile, retail favourites GME and TSLA look quiet. GameStop's SI sits at 12.8%. Tesla is barely shorted at 2.75%. No squeeze setup there for now.

SMMT (Summit Therapeutics) added 5 points to reach 28%, continuing a persistent short build in the clinical-stage biotech space.