Diodes Incorporated's (NASDAQ:DIOD) price-to-earnings (or "P/E") ratio of 14.3x might make it look like a buy right now compared to the market in the United States, where around half of the companies have P/E ratios above 17x and even P/E's above 33x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's limited.

Recent times haven't been advantageous for Diodes as its earnings have been falling quicker than most other companies. It seems that many are expecting the dismal earnings performance to persist, which has repressed the P/E. You'd much rather the company wasn't bleeding earnings if you still believe in the business. If not, then existing shareholders will probably struggle to get excited about the future direction of the share price.

Is There Any Growth For Diodes?

The only time you'd be truly comfortable seeing a P/E as low as Diodes' is when the company's growth is on track to lag the market.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 32%. Even so, admirably EPS has lifted 157% in aggregate from three years ago, notwithstanding the last 12 months. 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.

Shifting to the future, estimates from the seven analysts covering the company suggest earnings growth is heading into negative territory, declining 3.0% per year over the next three years. That's not great when the rest of the market is expected to grow by 10% per annum.

With this information, we are not surprised that Diodes is trading at a P/E lower than the market. However, shrinking earnings are unlikely to lead to a stable P/E over the longer term. There's potential for the P/E to fall to even lower levels if the company doesn't improve its profitability.

The Bottom Line On Diodes' P/E

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

As we suspected, our examination of Diodes' analyst forecasts revealed that its outlook for shrinking earnings is contributing to its low P/E. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. It's hard to see the share price rising strongly in the near future under these circumstances.

Before you settle on your opinion, we've discovered 2 warning signs for Diodes (1 can't be ignored!) that you should be aware of.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on a low P/E.

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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.