What Is going on with this stock?...
I looked at a tool I have that shows raw data and I see no trade at 4.57 reported on yahoo. I do see a lot of trading at levels as high as 5.22 with a last transaction of 5.1301 at 18:05.55. Not sure what is going on with yahoo.
Caused by 300 shares, so don't worry.
Must be some kind of glitch. There is no news indicating why that significant drop would occur.