Ideally, your overall portfolio should beat the market average. But the main game is to find enough winners to more than offset the losers At this point some shareholders may be questioning their investment in Tech Semiconductors Co., Ltd. (SZSE:300046), since the last five years saw the share price fall 46%. We also note that the stock has performed poorly over the last year, with the share price down 43%. The falls have accelerated recently, with the share price down 29% in the last three months.

Since Tech Semiconductors has shed CN¥520m 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 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 five years of share price growth, Tech Semiconductors moved from a loss to profitability. Most would consider that to be a good thing, so it's counter-intuitive to see the share price declining. Other metrics might give us a better handle on how its value is changing over time.

In contrast to the share price, revenue has actually increased by 0.3% a year in the five year period. A more detailed examination of the revenue and earnings may or may not explain why the share price languishes; there could be an opportunity.

The company's revenue and earnings (over time) are depicted in the image below (click to see the exact numbers).

This free interactive report on Tech Semiconductors' balance sheet strength is a great place to start, if you want to investigate the stock further.

A Different Perspective

While the broader market lost about 20% in the twelve months, Tech Semiconductors shareholders did even worse, losing 43%. 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. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 8% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. Is Tech Semiconductors cheap compared to other companies? These 3 valuation measures might help you decide.

If you are like me, then you will not want to miss this free list of growing companies that insiders are buying.

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.