Most common reason to sell in a blind sale is the news that may be coming and insiders do not want to be blamed of using inside information. We all know that news will come in the coming weeksqmonths so insiders have to be carefull.... there should be no doubt that this important approval will move things in PLX- The CEO said companies were willing to get into cooperation subject to FDA approval. i.e validation of the platform- now is the time for them to jump in! this new platform allows many business options.
There is a SEC rule for that. I need to leave now for an urgent site visit with one of my customers, so I am in a rush, but I will be able to dig up the rule tomorrow. Basically, it is the best protection against insider trading allegations.