As an investor, mistakes are inevitable. But really big losses can really drag down an overall portfolio. So consider, for a moment, the misfortune of Magnachip Semiconductor Corporation (NYSE:MX) investors who have held the stock for three years as it declined a whopping 83%. That would be a disturbing experience. And over the last year the share price fell 37%, so we doubt many shareholders are delighted. Shareholders have had an even rougher run lately, with the share price down 22% in the last 90 days. Of course, this share price action may well have been influenced by the 9.1% decline in the broader market, throughout the period. We really hope anyone holding through that price crash has a diversified portfolio. Even when you lose money, you don't have to lose the lesson.

It's worthwhile assessing if the company's economics have been moving in lockstep with these underwhelming shareholder returns, or if there is some disparity between the two. So let's do just that.

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Magnachip Semiconductor isn't currently profitable, so most analysts would look to revenue growth to get an idea of how fast the underlying business is growing. Generally speaking, companies without profits are expected to grow revenue every year, and at a good clip. Some companies are willing to postpone profitability to grow revenue faster, but in that case one would hope for good top-line growth to make up for the lack of earnings.

Over the last three years, Magnachip Semiconductor's revenue dropped 31% per year. That means its revenue trend is very weak compared to other loss making companies. And as you might expect the share price has been weak too, dropping at a rate of 22% per year. We prefer leave it to clowns to try to catch falling knives, like this stock. It's worth remembering that investors call buying a steeply falling share price 'catching a falling knife' because it is a dangerous pass time.

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

It's good to see that there was some significant insider buying in the last three months. That's a positive. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. If you are thinking of buying or selling Magnachip Semiconductor stock, you should check out this free report showing analyst profit forecasts.

A Different Perspective

Investors in Magnachip Semiconductor had a tough year, with a total loss of 37%, against a market gain of about 11%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 11% per year over five years. 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. It's always interesting to track share price performance over the longer term. But to understand Magnachip Semiconductor better, we need to consider many other factors. Case in point: We've spotted 1 warning sign for Magnachip Semiconductor you should be aware of.

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