Aehr Test Systems, Inc. (NASDAQ:AEHR) shareholders are no doubt pleased to see that the share price has bounced 30% in the last month, although it is still struggling to make up recently lost ground. Still, the 30-day jump doesn't change the fact that longer term shareholders have seen their stock decimated by the 50% share price drop in the last twelve months.

Even after such a large jump in price, Aehr Test Systems' price-to-earnings (or "P/E") ratio of 15.9x might still 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 19x and even P/E's above 35x are quite common. However, the P/E might be low for a reason and it requires further investigation to determine if it's justified.

Aehr Test Systems certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. One possibility is that the P/E is low because investors think this strong earnings growth might actually underperform the broader market in the near future. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

Does Growth Match The Low P/E?

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. Although, its longer-term performance hasn't been as strong with three-year EPS growth being relatively non-existent overall. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 15% shows it's noticeably less attractive on an annualised basis.

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 Key Takeaway

Aehr Test Systems' stock might have been given a solid boost, but its P/E certainly hasn't reached any great heights. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Aehr Test Systems maintains its low P/E on the weakness of its recent three-year growth being lower than the wider market forecast, as expected. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. If recent medium-term earnings trends continue, it's hard to see the share price rising strongly in the near future under these circumstances.

You need to take note of risks, for example - Aehr Test Systems has 3 warning signs (and 1 which is a bit concerning) we think you should know about.

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.