Many investors define successful investing as beating the market average over the long term. But its virtually certain that sometimes you will buy stocks that fall short of the market average returns. We regret to report that long term ACI Worldwide, Inc. (NASDAQ:ACIW) shareholders have had that experience, with the share price dropping 22% in three years, versus a market return of about 15%.

After losing 4.5% this past week, it's worth investigating the company's fundamentals to see what we can infer from past performance.

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. 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, ACI Worldwide actually saw its earnings per share (EPS) improve by 22% 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). Or else the company was over-hyped in the past, and so its growth has disappointed.

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

Revenue is actually up 3.8% over the three years, so the share price drop doesn't seem to hinge on revenue, either. It's probably worth investigating ACI Worldwide further; while we may be missing something on this analysis, there might also be an opportunity.

The graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

We consider it positive that insiders have made significant purchases in the last year. Having said that, most people consider earnings and revenue growth trends to be a more meaningful guide to the business. This free report showing analyst forecasts should help you form a view on ACI Worldwide

A Different Perspective

ACI Worldwide shareholders gained a total return of 20% during the year. Unfortunately this falls short of the market return. On the bright side, that's still a gain, and it is certainly better than the yearly loss of about 1.5% endured over half a decade. It could well be that the business is stabilizing. 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 ACI Worldwide you should be aware of.

There are plenty of other companies that have insiders buying up shares. You probably do not want to miss this free list of growing companies that insiders are buying.

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.