Tower Semiconductor Ltd. (NASDAQ:TSEM) shareholders might understandably be very concerned that the share price has dropped 43% in the last quarter. On the bright side the share price is up over the last half decade. However we are not very impressed because the share price is only up 70%, less than the market return of 95%.

While this past week has detracted from the company's five-year return, let's look at the recent trends of the underlying business and see if the gains have been in alignment.

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There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

Over half a decade, Tower Semiconductor managed to grow its earnings per share at 17% a year. This EPS growth is higher than the 11% average annual increase in the share price. So it seems the market isn't so enthusiastic about the stock these days.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

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

A Different Perspective

We regret to report that Tower Semiconductor shareholders are down 9.2% for the year. Unfortunately, that's worse than the broader market decline of 1.9%. 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. On the bright side, long term shareholders have made money, with a gain of 11% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. 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 1 warning sign for Tower Semiconductor that you should be aware of before investing here.

But note: Tower Semiconductor 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 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.