Edited by Peter Hillerberg1 min readStories are generated from ORTEX data and reviewed by the ORTEX team. How we publish
Short sellers turned aggressive this past week. Data from ORTEX shows several notable positions being built across healthcare, energy and consumer names.
MMED (MiniMed Group) stands out as the biggest mover. Short interest hit 80% of free float as of 5 October, up 9.5 percentage points in just seven days. Availability has nearly vanished at 0.4%, making new borrows extremely hard to find. Cost to borrow sits above 19%. The setup looks increasingly squeeze-prone.
TLN (Talen Energy) saw its SI % FF jump from 6.4% to 11.5% in a week, a near-doubling. Bears are clearly targeting the nuclear power operator as sentiment around the sector shifts. ORTEX nuclear output data shows reactor output at Vistra's (VST) fleet running 10 standard deviations above its own history, suggesting short sellers may be betting on a sector re-rating that reverses recent power price tailwinds.
CHWY (Chewy) added 4.2 percentage points to reach 69.8% SI of free float. The pet retailer now carries 34.4 days to cover. Bears remain heavy despite plenty of available stock at 441%.
WOLF (Wolfspeed) stays one of the most shorted mid-caps. SI sits at 81% of free float with zero availability, and 11.3 days to cover. The semiconductor maker continues to bleed bearish pressure.
HTZ (Hertz) holds 70% SI of free float with no shares available to borrow. New York State vehicle registrations fell 46% year on year in September 2026, per ORTEX alt data, adding macro weight to the bearish thesis on car rental demand.
ORTEX Market Intelligence content is generated by AI from a snapshot of ORTEX's proprietary data and reviewed by the ORTEX team. Content is informational only and does not constitute investment advice.
