The most you can lose on any stock (assuming you don't use leverage) is 100% of your money. But when you pick a company that is really flourishing, you can make more than 100%. For instance the ATI Inc. (NYSE:ATI) share price is 129% higher than it was three years ago. That sort of return is as solid as granite. On top of that, the share price is up 15% in about a quarter. But this could be related to the strong market, which is up 15% in the last three months.

Now it's worth having a look at the company's fundamentals too, because that will help us determine if the long term shareholder return has matched the performance of the underlying business.

See our latest analysis for ATI

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

ATI became profitable within the last three years. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

We know that ATI has improved its bottom line over the last three years, but what does the future have in store? If you are thinking of buying or selling ATI stock, you should check out this FREE detailed report on its balance sheet.

A Different Perspective

ATI shareholders are up 18% for the year. But that was short of the market average. The silver lining is that the gain was actually better than the average annual return of 10% per year over five year. It is possible that returns will improve along with the business fundamentals. 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. Case in point: We've spotted 1 warning sign for ATI you should be aware of.

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.