Aehr Test Systems, Inc. (NASDAQ:AEHR) shareholders have seen the share price descend 16% over the month. But that does not change the realty that the stock's performance has been terrific, over five years. Indeed, the share price is up a whopping 588% in that time. So it might be that some shareholders are taking profits after good performance. But the real question is whether the business fundamentals can improve over the long term. While the long term returns are impressive, we do have some sympathy for those who bought more recently, given the 72% drop, in the last year. Anyone who held for that rewarding ride would probably be keen to talk about it.

Now it's worth having a look at the company's fundamentals too, because that will help us determine if the long term shareholder return has matched the performance of the underlying business.

Check out our latest analysis for Aehr Test Systems

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

During the five years of share price growth, Aehr Test Systems moved from a loss to profitability. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

It's good to see that there was some significant insider buying in the last three months. That's a positive. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. It might be well worthwhile taking a look at our free report on Aehr Test Systems' earnings, revenue and cash flow.

A Different Perspective

Aehr Test Systems shareholders are down 72% for the year, but the market itself is up 32%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 47%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Even so, be aware that Aehr Test Systems is showing 3 warning signs in our investment analysis , and 1 of those is significant...

Aehr Test Systems is not the only stock that insiders are buying. For those who like to find lesser know companies this free list of growing companies with recent insider purchasing, could be just the ticket.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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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.