As an investor, mistakes are inevitable. But really big losses can really drag down an overall portfolio. So take a moment to sympathize with the long term shareholders of QuakeSafe Technologies Co., Ltd. (SZSE:300767), who have seen the share price tank a massive 78% over a three year period. That might cause some serious doubts about the merits of the initial decision to buy the stock, to put it mildly. And more recent buyers are having a tough time too, with a drop of 73% in the last year. The falls have accelerated recently, with the share price down 36% in the last three months.

Since QuakeSafe Technologies has shed CN¥457m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

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. 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).

QuakeSafe Technologies saw its EPS decline at a compound rate of 40% per year, over the last three years. The 39% average annual share price decline is remarkably close to the EPS decline. So it seems like sentiment towards the stock hasn't changed all that much over time. Rather, the share price has approximately tracked EPS growth.

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

Dive deeper into QuakeSafe Technologies' key metrics by checking this interactive graph of QuakeSafe Technologies's earnings, revenue and cash flow.

A Different Perspective

We regret to report that QuakeSafe Technologies shareholders are down 73% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 13%. However, it could simply be that the share price has been impacted by broader market jitters. It might be worth keeping an eye on the fundamentals, in case there's a good opportunity. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 1.6% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. For example, we've discovered 2 warning signs for QuakeSafe Technologies that you should be aware of before investing here.

Of course QuakeSafe Technologies may not be the best stock to buy. So you may wish to see this free collection of growth stocks.

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