Please read this page as an example of investors selling stock en masse with private dispositions:
https://investorplace.com/2013/09/insider-selling-at-brinker/
Now take a look at last Friday 9/15:
http://www.nasdaq.com/symbol/low/insider-trades?sortname=lastdate&sorttype=1
Looks like a bunch of the major players are
making moves.
If you have a considerable amount of stock, I would suggest following their lead and sell soon. Looks like it's going to tank soon.