As an investor its worth striving to ensure your overall portfolio beats the market average. But the risk of stock picking is that you will likely buy under-performing companies. Unfortunately, that's been the case for longer term Comcast Corporation (NASDAQ:CMCSA) shareholders, since the share price is down 23% in the last three years, falling well short of the market return of around 40%. Furthermore, it's down 17% in about a quarter. That's not much fun for holders.

It's worthwhile assessing if the company's economics have been moving in lockstep with these underwhelming shareholder returns, or if there is some disparity between the two. So let's do just that.

Check out our latest analysis for Comcast

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. 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 the unfortunate three years of share price decline, Comcast actually saw its earnings per share (EPS) improve by 12% per year. Given the share price reaction, one might suspect that EPS is not a good guide to the business performance during the period (perhaps due to a one-off loss or gain). Alternatively, growth expectations may have been unreasonable in the past.

It's worth taking a look at other metrics, because the EPS growth doesn't seem to match with the falling share price.

The company has kept revenue pretty healthy over the last three years, so we doubt that explains the falling share price. There doesn't seem to be any clear correlation between the fundamental business metrics and the share price. That could mean that the stock was previously overrated, or it could spell opportunity now.

You can see below how earnings and revenue have changed over time (discover the exact values by clicking on the image).

Comcast is a well known stock, with plenty of analyst coverage, suggesting some visibility into future growth. If you are thinking of buying or selling Comcast stock, you should check out this free report showing analyst consensus estimates for future profits.

What About Dividends?

When looking at investment returns, it is important to consider the difference between total shareholder return (TSR) and share price return. The TSR is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. We note that for Comcast the TSR over the last 3 years was -16%, which is better than the share price return mentioned above. This is largely a result of its dividend payments!

A Different Perspective

Comcast shareholders are down 13% for the year (even including dividends), but the market itself is up 15%. 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 0.6%, each year, over five years. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. 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. For instance, we've identified 2 warning signs for Comcast (1 is a bit concerning) that you should be aware of.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: many of them are unnoticed AND have attractive valuation).

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.