Ideally, your overall portfolio should beat the market average. But even the best stock picker will only win with some selections. So we wouldn't blame long term Tellgen Corporation (SZSE:300642) shareholders for doubting their decision to hold, with the stock down 44% over a half decade. And the share price decline continued over the last week, dropping some 11%.

Since Tellgen has shed CN¥431m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

Check out our latest analysis for Tellgen

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During the unfortunate half decade during which the share price slipped, Tellgen actually saw its earnings per share (EPS) improve by 1.4% per year. So it doesn't seem like EPS is a great guide to understanding how the market is valuing the stock. Alternatively, growth expectations may have been unreasonable in the past.

By glancing at these numbers, we'd posit that the the market had expectations of much higher growth, five years ago. Looking to other metrics might better explain the share price change.

The modest 1.2% dividend yield is unlikely to be guiding the market view of the stock. In contrast to the share price, revenue has actually increased by 19% a year in the five year period. So it seems one might have to take closer look at the fundamentals to understand why the share price languishes. After all, there may be an opportunity.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

Take a more thorough look at Tellgen's financial health with this free report on its balance sheet.

A Different Perspective

Tellgen's TSR for the year was broadly in line with the market average, at 14%. The silver lining is that the share price is up in the short term, which flies in the face of the annualised loss of 7% over the last five years. We're pretty skeptical of turnaround stories, but it's good to see the recent share price recovery. 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. Consider for instance, the ever-present spectre of investment risk. We've identified 3 warning signs with Tellgen , and understanding them should be part of your investment process.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: insiders have been buying them).

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.