NSL Ltd (SGX:N02) shareholders have had their patience rewarded with a 37% share price jump in the last month. The last 30 days bring the annual gain to a very sharp 31%.

Following the firm bounce in price, NSL's price-to-earnings (or "P/E") ratio of 34.8x might make it look like a strong sell right now compared to the market in Singapore, where around half of the companies have P/E ratios below 13x and even P/E's below 7x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

As an illustration, earnings have deteriorated at NSL over the last year, which is not ideal at all. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/E from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

See our latest analysis for NSL

Is There Enough Growth For NSL?

In order to justify its P/E ratio, NSL would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered a frustrating 17% decrease to the company's bottom line. This has erased any of its gains during the last three years, with practically no change in EPS being achieved in total. 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 8.9% 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 NSL 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.

The Key Takeaway

The strong share price surge has got NSL's P/E rushing to great heights as well. Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

We've established that NSL currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely to support such positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

You should always think about risks. Case in point, we've spotted 4 warning signs for NSL you should be aware of.

If these risks are making you reconsider your opinion on NSL, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.