CEO Trims Marriott Stake With Shares at All-Time High JHVEPhoto / iStock Editorial via Getty Images Following the behavior of company insiders as they manage their positions in their own companies can reveal a lot. People may sell shares for many reasons, such as buying a house, paying for college, or estate planning. Generally, they buy shares for only one reason: to make more money.Often, one of the largest and best-informed shareholders in any company is the chief executive officer. Let’s have a look a ...