CEO Dumps 20% of Booking Shares Orbon Alija / E+ via Getty Images Investors can learn much by paying attention to the behavior of corporate insiders as they handle positions in their own companies. People may sell shares for various reasons (such as buying a house, paying for college, or getting ready for retirement). They generally buy for only one reason: they expect to make more money.Often, one of the largest and best-informed shareholders in any company is the chief executive officer. Let’s see wheth ...