Bio-Rad Laboratories, Inc. (NYSE:BIO) shareholders should be happy to see the share price up 15% in the last month. But that cannot eclipse the less-than-impressive returns over the last three years. After all, the share price is down 42% in the last three years, significantly under-performing the market.

While the last three years has been tough for Bio-Rad Laboratories shareholders, this past week has shown signs of promise. So let's look at the longer term fundamentals and see if they've been the driver of the negative returns.

See our latest analysis for Bio-Rad Laboratories

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. 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.

We know that Bio-Rad Laboratories has been profitable in the past. On the other hand, it reported a trailing twelve months loss, suggesting it isn't reliably profitable. Other metrics may better explain the share price move.

With revenue flat over three years, it seems unlikely that the share price is reflecting the top line. We're not entirely sure why the share price is dropped, but it does seem likely investors have become less optimistic about the business.

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

You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

A Different Perspective

Bio-Rad Laboratories shareholders are down 23% for the year, but the market itself is up 14%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. On the bright side, long term shareholders have made money, with a gain of 3% per year over half a decade. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. Most investors take the time to check the data on insider transactions. You can click here to see if insiders have been buying or selling.

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 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.