The worst result, after buying shares in a company (assuming no leverage), would be if you lose all the money you put in. But when you pick a company that is really flourishing, you can make more than 100%. To wit, the Estun Automation Co., Ltd (SZSE:002747) share price has flown 207% in the last three years. How nice for those who held the stock! Also pleasing for shareholders was the 74% gain in the last three months.

Although Estun Automation has shed CN¥1.1b from its market cap this week, let's take a look at its longer term fundamental trends and see if they've driven returns.

View our latest analysis for Estun Automation

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.

Estun Automation was able to grow its EPS at 13% per year over three years, sending the share price higher. This EPS growth is lower than the 45% average annual increase in the share price. So it's fair to assume the market has a higher opinion of the business than it did three years ago. It is quite common to see investors become enamoured with a business, after a few years of solid progress. This favorable sentiment is reflected in its (fairly optimistic) P/E ratio of 147.95.

The graphic below depicts how EPS has changed over time (unveil the exact values by clicking on the image).

It's probably worth noting that the CEO is paid less than the median at similar sized companies. But while CEO remuneration is always worth checking, the really important question is whether the company can grow earnings going forward. Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here..

A Different Perspective

We regret to report that Estun Automation shareholders are down 29% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 11%. Having said that, it's inevitable that some stocks will be oversold in a falling market. The key is to keep your eyes on the fundamental developments. On the bright side, long term shareholders have made money, with a gain of 16% per year over half a decade. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. 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. Case in point: We've spotted 3 warning signs for Estun Automation you should be aware of, and 1 of them doesn't sit too well with us.

We will like Estun Automation better if we see some big insider buys. While we wait, check out this free list of growing companies with considerable, recent, insider buying.

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