With a price-to-earnings (or "P/E") ratio of 8.6x Mueller Industries, Inc. (NYSE:MLI) may be sending bullish signals at the moment, given that almost half of all companies in the United States have P/E ratios greater than 17x and even P/E's higher than 33x are not unusual. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the reduced P/E.

As an illustration, earnings have deteriorated at Mueller Industries over the last year, which is not ideal at all. One possibility is that the P/E is low because investors think the company won't do enough to avoid underperforming the broader market in the near future. However, if this doesn't eventuate then existing shareholders may be feeling optimistic about the future direction of the share price.

View our latest analysis for Mueller Industries

How Is Mueller Industries' Growth Trending?

In order to justify its P/E ratio, Mueller Industries would need to produce sluggish growth that's trailing the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 3.2%. However, a few very strong years before that means that it was still able to grow EPS by an impressive 367% in total over the last three years. Although it's been a bumpy ride, it's still fair to say the earnings growth recently has been more than adequate for the company.

This is in contrast to the rest of the market, which is expected to grow by 10% over the next year, materially lower than the company's recent medium-term annualised growth rates.

With this information, we find it odd that Mueller Industries is trading at a P/E lower than the market. Apparently some shareholders believe the recent performance has exceeded its limits and have been accepting significantly lower selling prices.

The Final Word

While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

We've established that Mueller Industries currently trades on a much lower than expected P/E since its recent three-year growth is higher than the wider market forecast. There could be some major unobserved threats to earnings preventing the P/E ratio from matching this positive performance. It appears many are indeed anticipating earnings instability, because the persistence of these recent medium-term conditions would normally provide a boost to the share price.

You always need to take note of risks, for example - Mueller Industries has 1 warning sign we think you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.