Bears Pile In: SI Spikes Hit Pharma and Rail

Short sellers moved fast this week. ORTEX data through September 24 shows some sharp single-stock moves across pharma, rail, and semiconductors.

The week's biggest mover: MMED — MiniMed Group — saw its SI % of free float jump from 38.5% to 68.3% in just seven days. That's a nearly 30 percentage point surge. Availability has collapsed to just 2.3% of short interest. Squeezing room is almost non-existent.

WOLF — Wolfspeed — remains one of the most heavily shorted large-cap names. SI sits at 80.4% of FF with zero availability. The chip maker has shed 45% over three months. Bears are not covering.

Rail takes a hit: NSC short interest jumped 35% in a single session, hitting 3.37% of float. Norfolk Southern is a $70bn company — a move that size draws institutional eyes fast.

SPCX — Space Exploration Technologies — added nearly 10 points of SI this week, now at 30.6% of FF.

GLSI — Greenwich LifeSciences — carries a short score of 92.7 and 25 days to cover. With analyst targets implying significant upside, the setup is a classic squeeze candidate.

Meanwhile, ARM rallied on Meta's Muse AI launch — a reminder that heavily shorted tech names can reverse hard on catalyst news.