I read with interest of the danger of overinvesting into one stock counter. I used to have such investment strategy many years ago. I have since ditched such strategy after encountering setback in the stock investment through such strategy. I adopted the diversification approach in which I will not allocate more than 10% in one stock counter. Such diversification strategy allows me to sleep soundly at night without worrying about the performance of the stock. I adopt dividend growth strategy in which I focus on the dividend which will cover my expense on long run for a lifetime.