Last year’s best-performing Fortune 500 stocks had something in common: They didn’t pay dividends. The top two companies, Netflix NFLX 2.16% and Amazon.com AMZN 1.77% (up 134% and 118%, respectively, in 2015), were the epitome of momentum stocks that, until recently, were all the rage with investors—stocks to own because they were on a hot streak, not stocks to rely on for long-term growth and security.