It hasn't been the best quarter for Amkor Technology, Inc. (NASDAQ:AMKR) shareholders, since the share price has fallen 11% in that time. But in stark contrast, the returns over the last half decade have impressed. In fact, the share price is 101% higher today. Generally speaking the long term returns will give you a better idea of business quality than short periods can. Of course, that doesn't necessarily mean it's cheap now. Unfortunately not all shareholders will have held it for the long term, so spare a thought for those caught in the 22% decline over the last twelve months.

So let's investigate and see if the longer term performance of the company has been in line with the underlying business' progress.

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

During five years of share price growth, Amkor Technology achieved compound earnings per share (EPS) growth of 48% per year. This EPS growth is higher than the 15% average annual increase in the share price. Therefore, it seems the market has become relatively pessimistic about the company.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

This free interactive report on Amkor Technology's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

What About Dividends?

It is important to consider the total shareholder return, as well as the share price return, for any given stock. Whereas the share price return only reflects the change in the share price, the TSR includes the value of dividends (assuming they were reinvested) and the benefit of any discounted capital raising or spin-off. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. As it happens, Amkor Technology's TSR for the last 5 years was 112%, which exceeds the share price return mentioned earlier. This is largely a result of its dividend payments!

A Different Perspective

Amkor Technology shareholders are down 20% for the year (even including dividends), but the market itself is up 24%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 16%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. Most investors take the time to check the data on insider transactions. You can click here to see if insiders have been buying or selling.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will grow earnings.

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.