Shareholders in STMicroelectronics (EPA:STMPA) are in the red if they invested three years ago

As an investor its worth striving to ensure your overall portfolio beats the market average. But the risk of stock picking is that you will likely buy under-performing companies. Unfortunately, that's been the case for longer term STMicroelectronics N.V. (EPA:STMPA) shareholders, since the share price is down 37% in the last three years, falling well short of the market return of around 20%.

So let's have a look and see if the longer term performance of the company has been in line with the underlying business' progress.

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While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. 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.

During the three years that the share price fell, STMicroelectronics' earnings per share (EPS) dropped by 46% each year. In comparison the 14% compound annual share price decline isn't as bad as the EPS drop-off. So, despite the prior disappointment, shareholders must have some confidence the situation will improve, longer term.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

This free interactive report on STMicroelectronics' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Investors in STMicroelectronics had a tough year, with a total loss of 3.1% (including dividends), against a market gain of about 14%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. However, the loss over the last year isn't as bad as the 5% per annum loss investors have suffered over the last half decade. We would want clear information suggesting the company will grow, before taking the view that the share price will stabilize. 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 risks, for instance. Every company has them, and we've spotted 2 warning signs for STMicroelectronics you should know about.

But note: STMicroelectronics may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

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