With a median price-to-earnings (or "P/E") ratio of close to 17x in the United States, you could be forgiven for feeling indifferent about SEI Investments Company's (NASDAQ:SEIC) P/E ratio of 18.3x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/E.

While the market has experienced earnings growth lately, SEI Investments' earnings have gone into reverse gear, which is not great. It might be that many expect the dour earnings performance to strengthen positively, which has kept the P/E from falling. If not, then existing shareholders may be a little nervous about the viability of the share price.

View our latest analysis for SEI Investments

Is There Some Growth For SEI Investments?

SEI Investments' P/E ratio would be typical for a company that's only expected to deliver moderate growth, and importantly, perform in line with the market.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 8.3%. This has soured the latest three-year period, which nevertheless managed to deliver a decent 14% overall rise in EPS. So we can start by confirming that the company has generally done a good job of growing earnings over that time, even though it had some hiccups along the way.

Shifting to the future, estimates from the seven analysts covering the company suggest earnings should grow by 10% per annum over the next three years. That's shaping up to be materially lower than the 13% each year growth forecast for the broader market.

With this information, we find it interesting that SEI Investments is trading at a fairly similar P/E to the market. It seems most investors are ignoring the fairly limited growth expectations and are willing to pay up for exposure to the stock. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

The Key Takeaway

While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

We've established that SEI Investments currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

You always need to take note of risks, for example - SEI Investments has 1 warning sign we think you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.