It's nice to see the Air Transport Services Group, Inc. (NASDAQ:ATSG) share price up 15% in a week. But that doesn't change the fact that the returns over the last three years have been less than pleasing. In fact, the share price is down 42% in the last three years, falling well short of the market return.

While the last three years has been tough for Air Transport Services Group shareholders, this past week has shown signs of promise. So let's look at the longer term fundamentals and see if they've been the driver of the negative returns.

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

Air Transport Services Group became profitable within the last five years. We would usually expect to see the share price rise as a result. So it's worth looking at other metrics to try to understand the share price move.

We note that, in three years, revenue has actually grown at a 10% annual rate, so that doesn't seem to be a reason to sell shares. This analysis is just perfunctory, but it might be worth researching Air Transport Services Group more closely, as sometimes stocks fall unfairly. This could present an opportunity.

The image below shows how earnings and revenue have tracked over time (if you click on the image you can see greater detail).

We like that insiders have been buying shares in the last twelve months. Having said that, most people consider earnings and revenue growth trends to be a more meaningful guide to the business. If you are thinking of buying or selling Air Transport Services Group stock, you should check out this free report showing analyst profit forecasts.

A Different Perspective

While the broader market gained around 28% in the last year, Air Transport Services Group shareholders lost 6.2%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. However, the loss over the last year isn't as bad as the 6% per annum loss investors have suffered over the last half decade. We'd need to see some sustained improvements in the key metrics before we could muster much enthusiasm. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Consider for instance, the ever-present spectre of investment risk. We've identified 2 warning signs with Air Transport Services Group (at least 1 which makes us a bit uncomfortable) , and understanding them should be part of your investment process.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: insiders have been buying them).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.