If they are directors they would have to file a 144. That form lists the intent to sell a set amount. If they wished to sell 1000 shares and sold only 800, the requirement to file an amended 144 comes into play showing the amount left unsold. 144 are not public documents and to view them one has to have access to a Bloomberg terminal for example (they are not cheap). Insider trading reports are not required for pink sheets so unless someone has access to the 144's and they are stating someone may or may not have sold, they are only guessing. It all comes down to who is listed as directors of the corporation.