The worst result, after buying shares in a company (assuming no leverage), would be if you lose all the money you put in. But in contrast you can make much more than 100% if the company does well. To wit, the Assured Guaranty Ltd. (NYSE:AGO) share price has flown 142% in the last three years. Most would be happy with that. Meanwhile the share price is 5.6% higher than it was a week ago.

Since the stock has added US$199m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

View our latest analysis for Assured Guaranty

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 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.

Assured Guaranty was able to grow its EPS at 14% per year over three years, sending the share price higher. In comparison, the 34% per year gain in the share price outpaces the EPS growth. So it's fair to assume the market has a higher opinion of the business than it did three years ago. It's not unusual to see the market 're-rate' a stock, after a few years of growth.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

We know that Assured Guaranty has improved its bottom line lately, but is it going to grow revenue? Check if analysts think Assured Guaranty will grow revenue in the future.

What About Dividends?

As well as measuring the share price return, investors should also consider the total shareholder return (TSR). Whereas the share price return only reflects the change in the share price, the TSR includes the value of dividends (assuming they were reinvested) and the benefit of any discounted capital raising or spin-off. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. In the case of Assured Guaranty, it has a TSR of 156% for the last 3 years. That exceeds its share price return that we previously mentioned. This is largely a result of its dividend payments!

A Different Perspective

Assured Guaranty's TSR for the year was broadly in line with the market average, at 12%. That gain looks pretty satisfying, and it is even better than the five-year TSR of 11% 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. Case in point: We've spotted 4 warning signs for Assured Guaranty you should be aware of, and 1 of them makes us a bit uncomfortable.

For those who like to find winning investments this free list of growing companies with recent insider purchasing, could be just the ticket.

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.