Bears Pile In as SpaceX Mania Hits Markets

Short sellers are making bold moves this week. Cerebras Systems tops the movers list. Its SI % FF jumped from 6.3% to 25.5% in just seven days — a near four-fold spike.

Birkenstock is drawing heavy attention too. Bears lifted its short position from 21.9% to 29.7% of free float. The cost to borrow sits at 21.2% APR. Availability is near zero at just 0.04% — a sign the trade is extremely crowded.

Hertz remains a key battleground. Short interest hit 43.7% of free float, up from 39.4% a week ago. The rental car group is one of the most-shorted names in the mid-cap space.

Wolfspeed tells the other side of the story. Bears cut positions sharply — SI % FF dropped 21.5 points to 93%. That's still extreme, but the covering wave is notable.

On the social radar, SpaceX's historic market debut is dominating headlines. Related names are moving. Palantir has just 3.2% short interest. NVIDIA sits at 1.2% — shorts are not betting against either name.

Adobe reports earnings this week with 4.8% SI. Lennar and CarMax also face bears ahead of their prints, with SI at 8.9% and 11.7% respectively.

Data as of June 10, 2026. Not financial advice.