I have been watching a certain stock over the past couple months. I actually bought in @ .30 for 15000. On Friday, it opened at .585 and over the day it rose to a high of .90 with the last trade before @ .89. Then at what seems to me to be 5min after trading, a trade for 184100 shares went thru @ .728. This is concerning me as I have never seen something like this before. The stock is trading on pink sheets. Is this something I need to be concerned about? Can anyone explain this?