It's not a stretch to say that Sanmina Corporation's (NASDAQ:SANM) price-to-earnings (or "P/E") ratio of 16.5x right now seems quite "middle-of-the-road" compared to the market in the United States, where the median P/E ratio is around 18x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/E.

Sanmina has been struggling lately as its earnings have declined faster than most other companies. One possibility is that the P/E is moderate because investors think the company's earnings trend will eventually fall in line with most others in the market. If you still like the company, you'd want its earnings trajectory to turn around before making any decisions. Or at the very least, you'd be hoping it doesn't keep underperforming if your plan is to pick up some stock while it's not in favour.

What Are Growth Metrics Telling Us About The P/E?

The only time you'd be comfortable seeing a P/E like Sanmina's is when the company's growth is tracking the market closely.

Retrospectively, the last year delivered a frustrating 25% decrease to the company's bottom line. This has erased any of its gains during the last three years, with practically no change in EPS being achieved in total. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

Looking ahead now, EPS is anticipated to climb by 19% during the coming year according to the three analysts following the company. That's shaping up to be materially higher than the 15% growth forecast for the broader market.

With this information, we find it interesting that Sanmina is trading at a fairly similar P/E to the market. Apparently some shareholders are skeptical of the forecasts and have been accepting 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 Sanmina currently trades on a lower than expected P/E since its forecast growth is higher than the wider market. When we see a strong earnings outlook with faster-than-market growth, we assume potential risks are what might be placing pressure on the P/E ratio. It appears some are indeed anticipating earnings instability, because these conditions should normally provide a boost to the share price.

And what about other risks? Every company has them, and we've spotted 1 warning sign for Sanmina you should know about.

If these risks are making you reconsider your opinion on Sanmina, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.