As an investor its worth striving to ensure your overall portfolio beats the market average. But the risk of stock picking is that you will likely buy under-performing companies. We regret to report that long term Teradata Corporation (NYSE:TDC) shareholders have had that experience, with the share price dropping 33% in three years, versus a market return of about 20%. And more recent buyers are having a tough time too, with a drop of 32% in the last year. Unfortunately the share price momentum is still quite negative, with prices down 15% in thirty days. Importantly, this could be a market reaction to the recently released financial results. You can check out the latest numbers in our company report.

Given the past week has been tough on shareholders, let's investigate the fundamentals and see what we can learn.

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 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 unfortunate three years of share price decline, Teradata actually saw its earnings per share (EPS) improve by 50% 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.

Since the change in EPS doesn't seem to correlate with the change in share price, it's worth taking a look at other metrics.

The company has kept revenue pretty healthy over the last three years, so we doubt that explains the falling share price. We're not entirely sure why the share price is dropped, but it does seem likely investors have become less optimistic about the business.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

It is of course excellent to see how Teradata has grown profits over the years, but the future is more important for shareholders. If you are thinking of buying or selling Teradata stock, you should check out this FREE detailed report on its balance sheet.

A Different Perspective

Investors in Teradata had a tough year, with a total loss of 32%, against a market gain of about 28%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 1.6% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. 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. For instance, we've identified 2 warning signs for Teradata that you should be aware of.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will grow earnings.

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.