These companies are flying under the radar and have a long runway to grow.Investing isn't about living in the past, but buying companies that will do well in the future. You want to buy stocks that can grow sales and earnings while also trading at a reasonable valuation. A tough task, especially when the broad S&P 500 index is trading at a price-to-earnings ratio (P/E) close to all-time highs.In bull markets, smart investors stray away from the red-hot and popular stocks trading at nosebleed earnings multip ...