ITI and EDAC have the ideal earnings trade characters. Look at the charts of these two. Look at volume prior to breakout. No one and his dog was following these stocks or had any vague interest in them. The Kaboom reaction is because of surprise.
On a widely followed stock or a stock with high volume or if the earnings is 2 nd , 3 rd, or 4 th triple digit earnings, or if the company has pre announced earnings, the game is different. Here in these neglected stocks everyone gets the information at the same time.