Fair enough -- the "Most Shorted" index is actually a proprietary Goldman index that's only available to GS clients on the Bloomberg Terminal.
I've tried to check it from the terminal that have some access to, but can't pull it up. So I can't even tell you how many stocks are in it. That said, Ariad is generally in the top 20 most shorted stocks on the terminal's own listing.
Choosing two other stocks that may be in there and then looking at their long-term performance doesn't quite disprove my point about intra-day moves yesterday and extrapolated to today, but it's fine to be skeptical.
Skepticism is a great tool -- especially when applied even-handedly.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.