Heartland Express shares have lost about 20.3% since the beginning of the year versus the S&P 500's decline of -6.4%. What's Next for Heartland Express? While Heartland Express has underperformed the market so far this year, the question that comes to investors' minds is: what's next for the stock? There are no easy answers to this key question, but one reliable measure that can help investors address this is the company's earnings outlook.