The reason for all the selling yesterday was a Seeking Alpha article in which the author listed his reasons why he believes Orasure will lose their Abbievie agreement and why the stock price is in for a big drop. He clearly sold short prior to releasing the article, which is his right, but is also blatant manipulation.
The firm "Muddy Waters" has done it dozens of times and millions of dollars shorting corrupt Chinese companies that they have researched and exposed.
That said, if the information that this Seeking Alpha author can be proven to be lies, then he has opened himself up to the possibility of criminal prosecution for this manipulation.
The problem is the points the author makes seems well researched and very possibly true.
Nevertheless, I'm still hoping that the reason for today's conference call by Orasure is to completely disavow and discredit the claims made by the author of the article. If this turns out to be the case, then the stock price today will rebound in force and the Seeking Alpha author will get slaughtered in his short position.