Amkor Technology, Inc. (NASDAQ:AMKR) shareholders might be concerned after seeing the share price drop 24% in the last quarter. But that doesn't change the fact that the returns over the last five years have been very strong. It's fair to say most would be happy with 231% the gain in that time. To some, the recent pullback wouldn't be surprising after such a fast rise. The more important question is whether the stock is too cheap or too expensive today.

On the back of a solid 7-day performance, let's check what role the company's fundamentals have played in driving long term shareholder returns.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. 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.

Over half a decade, Amkor Technology managed to grow its earnings per share at 47% a year. The EPS growth is more impressive than the yearly share price gain of 27% over the same period. Therefore, it seems the market has become relatively pessimistic about the company.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

It might be well worthwhile taking a look at our free report on Amkor Technology's earnings, revenue and cash flow.

What About Dividends?

When looking at investment returns, it is important to consider the difference between total shareholder return (TSR) and share price return. The TSR is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. So for companies that pay a generous dividend, the TSR is often a lot higher than the share price return. In the case of Amkor Technology, it has a TSR of 244% for the last 5 years. That exceeds its share price return that we previously mentioned. The dividends paid by the company have thusly boosted the total shareholder return.

A Different Perspective

We're pleased to report that Amkor Technology shareholders have received a total shareholder return of 34% over one year. And that does include the dividend. That's better than the annualised return of 28% over half a decade, implying that the company is doing better recently. In the best case scenario, this may hint at some real business momentum, implying that now could be a great time to delve deeper. Before spending more time on Amkor Technology it might be wise to click here to see if insiders have been buying or selling shares.

But note: Amkor Technology may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

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.