CEO Slashes Napco Security Technologies Stake nuttiwut rodbangpong / iStock via Getty Images Investors can learn much by watching the behavior of corporate insiders as they handle positions in their own companies. People may sell shares for many reasons (such as buying a house, paying for college, or getting ready for retirement). They generally buy for only one reason: to make more money.The chief executive officer is often one of the largest and best-informed shareholders in any company. Let’s see wheth ...