Bears Pile In: GME, MiniMed Lead SI Surge

Short sellers are active this week. Several mid-cap names saw sharp short interest jumps in just seven days.

GameStop is back in the spotlight. SI jumped from 0.9% to 7.2% of free float in one week. That's a 6.3 percentage point surge. Social platforms are buzzing again — and bears are clearly not believers in the current $11.5B market cap.

MiniMed Group is another notable mover. SI hit 40.5% of FF, up nearly 9 points in seven days. Shares cost 22.9% APR to borrow. Availability stands at just 1.1% — that's razor-thin supply for new shorts.

Wolfspeed remains the most aggressively shorted large name. SI sits at 81.2% of FF. Availability is zero. No shares left to borrow. The semiconductor firm has shed 43% over three months.

Braveheart Bio is in extreme territory. SI hit 277% of FF — up 86 points in a week. This implies heavy recycled lending. CTB is 10.7% APR. Bears are clearly fighting hard on this biotech name.

Space Exploration Technologies also saw a 6.2-point SI jump to 29.4% of FF. Bears are building positions in the newly-listed space firm.

Across markets, short pressure is rising in biotech and high-growth tech names. Watch for squeeze setups where availability is near zero.