Bears Pile Into Cerebras, Birkenstock and Hertz

Short sellers have been busy this week. Cerebras Systems saw the biggest single-week jump among mid-cap US stocks. Short interest leapt from 6.3% to 25.5% of free float in just seven days.

Birkenstock is another standout mover. Bears pushed SI from 21.9% to 29.7% — a near 8 percentage point rise. Cost to borrow hit a steep 21.2% APR. Availability is near zero at just 0.04% of SI. That squeeze is extremely tight.

Hertz remains one of the most heavily shorted names in the US. SI climbed to 43.7% of free float, up 4.3 points on the week. With only 25% availability, shares to borrow are scarce.

Grindr added 8.6 points of short interest to reach 21.5% of free float. By contrast, availability here is ample at 160% — so bears can still pile in if they want.

On social platforms, SoundHound AI and CleanSpark are hot topics. SOUN sits at 37.8% shorted. CLSK holds 32.4%. Both are retail favourites that have attracted sustained short pressure.

XOMA Royalty remains in extreme territory at 90.1% of free float shorted — up another 10 points this week. Squeeze risk is real here.

Data as of June 10, 2026. This is not financial advice.