GTx's short interest is relatively modest at just over 3 million shares. -- Reported by Adam Feuerstein in Boston. Follow Adam Feuerstein on Twitter.
Shares of insulin maker Mannkind plummeted on news of a proposed stock split, staffing changes and a new iteration of its insulin.
Mannkind stock is suffering, and the company appears to be in trouble.
Other movers included Mannkind, Perrigo and Bristol-Myers Squibb.