The company's history helps build trust and respect among existing investors and investors who have yet to come along.
Change is inevitable in business, and those who fail to adapt and innovate are often destined for failure. Keeping track of changes in a company is one of the best ways for an investor to understand this concept. Also in order to understand a company's future it is important to understand its past, companies that want to succeed are adapting to the changing business landscape faster than ever.
A better understanding of the company you are going to invest in gives you a better chance of predicting its stock prices.