Aehr Test Systems, Inc. (NASDAQ:AEHR) shares have had a really impressive month, gaining 34% after a shaky period beforehand. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 48% in the last twelve months.

Even after such a large jump in price, Aehr Test Systems may still be sending bullish signals at the moment with its price-to-earnings (or "P/E") ratio of 14.7x, since almost half of all companies in the United States have P/E ratios greater than 20x and even P/E's higher than 35x are not unusual. However, the P/E might be low for a reason and it requires further investigation to determine if it's justified.

With earnings growth that's exceedingly strong of late, Aehr Test Systems has been doing very well. It might be that many expect the strong earnings performance to degrade substantially, which has repressed the P/E. If that doesn't eventuate, then existing shareholders have reason to be quite optimistic about the future direction of the share price.

How Is Aehr Test Systems' Growth Trending?

Aehr Test Systems' P/E ratio would be typical for a company that's only expected to deliver limited growth, and importantly, perform worse than the market.

Retrospectively, the last year delivered an exceptional 52% gain to the company's bottom line. However, the latest three year period hasn't been as great in aggregate as it didn't manage to provide any growth at all. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

This is in contrast to the rest of the market, which is expected to grow by 15% over the next year, materially higher than the company's recent medium-term annualised growth rates.

In light of this, it's understandable that Aehr Test Systems' P/E sits below the majority of other companies. Apparently many shareholders weren't comfortable holding on to something they believe will continue to trail the bourse.

The Final Word

Despite Aehr Test Systems' shares building up a head of steam, its P/E still lags most other companies. 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 Aehr Test Systems revealed its three-year earnings trends are contributing to its low P/E, given they look worse than current market expectations. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. Unless the recent medium-term conditions improve, they will continue to form a barrier for the share price around these levels.

Having said that, be aware Aehr Test Systems is showing 3 warning signs in our investment analysis, and 1 of those can't be ignored.

If you're unsure about the strength of Aehr Test Systems' business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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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.