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 on the bright side, you can make far more than 100% on a really good stock. For instance, the price of Sonic Automotive, Inc. (NYSE:SAH) stock is up an impressive 118% over the last five years. And in the last month, the share price has gained 22%.

Since the stock has added US$212m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

See our latest analysis for Sonic Automotive

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

During the last half decade, Sonic Automotive became profitable. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

We know that Sonic Automotive has improved its bottom line lately, but is it going to grow revenue? If you're interested, you could check this free report showing consensus revenue forecasts.

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 incorporates the value of any spin-offs or discounted capital raisings, along with any dividends, based on the assumption that the dividends are reinvested. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. In the case of Sonic Automotive, it has a TSR of 138% for the last 5 years. That exceeds its share price return that we previously mentioned. The dividends paid by the company have thusly boosted the total shareholder return.

A Different Perspective

Sonic Automotive shareholders have received returns of 37% over twelve months (even including dividends), which isn't far from the general market return. Most would be happy with a gain, and it helps that the year's return is actually better than the average return over five years, which was 19%. 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. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Even so, be aware that Sonic Automotive is showing 2 warning signs in our investment analysis , and 1 of those is a bit concerning...

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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.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.