CSP Inc. (NASDAQ:CSPI) shareholders would be excited to see that the share price has had a great month, posting a 26% gain and recovering from prior weakness. Looking further back, the 14% rise over the last twelve months isn't too bad notwithstanding the strength over the last 30 days.

After such a large jump in price, CSP may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 60.2x, since almost half of all companies in the United States have P/E ratios under 19x and even P/E's lower than 11x are not unusual. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

For example, consider that CSP's financial performance has been poor lately as its earnings have been in decline. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Does Growth Match The High P/E?

CSP's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 49% decrease to the company's bottom line. Unfortunately, that's brought it right back to where it started three years ago with EPS growth being virtually non-existent overall during that time. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Comparing that to the market, which is predicted to deliver 15% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

With this information, we find it concerning that CSP is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. There's a good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with recent growth rates.

What We Can Learn From CSP's P/E?

Shares in CSP have built up some good momentum lately, which has really inflated its 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.

We've established that CSP currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Having said that, be aware CSP is showing 2 warning signs in our investment analysis, 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.