When you buy shares in a company, it's worth keeping in mind the possibility that it could fail, and you could lose your money. But when you pick a company that is really flourishing, you can make more than 100%. Long term Affiliated Managers Group, Inc. (NYSE:AMG) shareholders would be well aware of this, since the stock is up 115% in five years. It's also good to see the share price up 14% over the last quarter.

Since it's been a strong week for Affiliated Managers Group shareholders, let's have a look at trend of the longer term fundamentals.

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During the last half decade, Affiliated Managers Group became profitable. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here. Since the company was unprofitable five years ago, but not three years ago, it's worth taking a look at the returns in the last three years, too. We can see that the Affiliated Managers Group share price is up 14% in the last three years. During the same period, EPS grew by 28% each year. This EPS growth is higher than the 4% average annual increase in the share price over the same three years. Therefore, it seems the market has moderated its expectations for growth, somewhat. This cautious sentiment is reflected in its (fairly low) P/E ratio of 8.32.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

Dive deeper into Affiliated Managers Group's key metrics by checking this interactive graph of Affiliated Managers Group's earnings, revenue and cash flow.

A Different Perspective

Affiliated Managers Group shareholders have received returns of 35% over twelve months (even including dividends), which isn't far from the general market return. That gain looks pretty satisfying, and it is even better than the five-year TSR of 17% per year. Even if the share price growth slows down from here, there's a good chance that this is business worth watching in the long term. 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 for instance, the ever-present spectre of investment risk. We've identified 2 warning signs with Affiliated Managers Group (at least 1 which is a bit unpleasant) , and understanding them should be part of your investment process.

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.