While Amkor Technology, Inc. (NASDAQ:AMKR) shareholders are probably generally happy, the stock hasn't had particularly good run recently, with the share price falling 29% in the last quarter. But in stark contrast, the returns over the last half decade have impressed. Indeed, the share price is up an impressive 148% 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. While the long term returns are impressive, we do have some sympathy for those who bought more recently, given the 43% drop, in the last year.

While the stock has fallen 5.8% this week, it's worth focusing on the longer term and seeing if the stocks historical returns have been driven by the underlying fundamentals.

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To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. 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).

During five years of share price growth, Amkor Technology achieved compound earnings per share (EPS) growth of 23% per year. This EPS growth is reasonably close to the 20% average annual increase in the share price. Therefore one could conclude that sentiment towards the shares hasn't morphed very much. Indeed, it would appear the share price is reacting to the EPS.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

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

What About Dividends?

It is important to consider the total shareholder return, as well as the share price return, for any given stock. 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. Arguably, the TSR gives a more comprehensive picture of the return generated by a stock. We note that for Amkor Technology the TSR over the last 5 years was 163%, which is better than the share price return mentioned above. And there's no prize for guessing that the dividend payments largely explain the divergence!

A Different Perspective

Investors in Amkor Technology had a tough year, with a total loss of 42% (including dividends), against a market gain of about 7.2%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. On the bright side, long term shareholders have made money, with a gain of 21% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. It's always interesting to track share price performance over the longer term. But to understand Amkor Technology better, we need to consider many other factors. Even so, be aware that Amkor Technology is showing 1 warning sign in our investment analysis , you should know about...

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can 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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.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.