If you buy and hold a stock for many years, you'd hope to be making a profit. But more than that, you probably want to see it rise more than the market average. But CoStar Group, Inc. (NASDAQ:CSGP) has fallen short of that second goal, with a share price rise of 24% over five years, which is below the market return. The last year has been disappointing, with the stock price down 14% in that time.

Let's take a look at the underlying fundamentals over the longer term, and see if they've been consistent with shareholders returns.

To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During five years of share price growth, CoStar Group actually saw its EPS drop 13% per year.

Since the EPS are down strongly, it seems highly unlikely market participants are looking at EPS to value the company. The falling EPS doesn't correlate with the climbing share price, so it's worth taking a look at other metrics.

On the other hand, CoStar Group's revenue is growing nicely, at a compound rate of 13% over the last five years. It's quite possible that management are prioritizing revenue growth over EPS growth at the moment.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

It's good to see that there was some significant insider buying in the last three months. That's a positive. That said, we think earnings and revenue growth trends are even more important factors to consider. If you are thinking of buying or selling CoStar Group stock, you should check out this free report showing analyst profit forecasts.

A Different Perspective

Investors in CoStar Group had a tough year, with a total loss of 14%, against a market gain of about 30%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. On the bright side, long term shareholders have made money, with a gain of 4% per year over half a decade. 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. Consider risks, for instance. Every company has them, and we've spotted 2 warning signs for CoStar Group you should know about.

There are plenty of other companies that have insiders buying up shares. You probably do not want to miss this free list of undervalued small cap companies that insiders are buying.

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.