This practice can help manage volatility because not all stocks move the same way when the broader market swings. It also prevents a big drop in a single security from inflicting major damage on an account. And perhaps most important, diversification can reduce the kind of bad emotional reactions that happen when accounts swing in value.
Tesla Motors (TSLA) has traded in a tight range since late October, even as volatility swept the broader market. Some potentially important things have happened during that time, including a so-called “golden cross” chart pattern.