Key Points The S&P 500 soared 3.5% in September, the first time its return has exceeded 3% during the month since 2010. September is usually the worst month for U.S. stocks, but the fourth quarter is typically the strongest quarter. Following a positive return in September, the S&P 500 has gained an average of 12% during the following year. 10 stocks we like better than S&P 500 Index › The S&P 500 (SNPINDEX: ^GSPC) advanced 3.5% last month, notching its best September since 2010. That was particu ...