Markets were down across the board today, as all three major indexes saw broad declines ranging from 0.7% for the Dow Jones Industrial Average to 1% for the Nasdaq. Concerns of Europe's turmoil showing up this earnings season is heightening as several companies have slashed forecasts. However, there is one stock in particular that is about to really shake up the Dow. Watch and be prepared before this shake-up happens on Aug. 10.