Bears Pile In: MiniMed, SpaceX, Wolfspeed Under Fire

Short sellers turned aggressive this week across several high-profile names. MiniMed Group saw the sharpest move among sizeable stocks. Its short interest jumped nearly 30 percentage points in seven days. It now sits at 68% of free float. Availability of shares to borrow has collapsed to just 2.3%. That combination spells a very tight squeeze setup.

Wolfspeed remains the most heavily shorted semiconductor name. SI stands at 80.4% of free float. Shares available to borrow: essentially zero. Short sellers are paying very little to hold the position, but finding new stock to borrow is nearly impossible.

Space Exploration Technologies — SpaceX — saw short interest climb nearly 10 points in a week to 30.6% of free float. Tesla's Optimus robot news lit up social media this week, and SpaceX was swept up in the sentiment trade. Bears are building.

On the other side, Chewy shorts covered hard. SI dropped almost 7 points to 67.2%. Availability is ample at 434%. Short sellers may be stepping aside ahead of a potential catalyst.

Braveheart Bio posted the most extreme reading in the dataset. SI hit 585% of free float — a staggering figure driven by a tiny free float and heavy borrow demand. Cost to borrow sits above 10%.

The week's clearest theme: healthcare and tech saw fresh short builds while pet-sector bears took profits.