Investors in Rambus (NASDAQ:RMBS) have seen solid returns of 281% over the past five years

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 when you pick a company that is really flourishing, you can make more than 100%. For instance, the price of Rambus Inc. (NASDAQ:RMBS) stock is up an impressive 281% over the last five years. It's also good to see the share price up 34% over the last quarter.

With that in mind, it's worth seeing if the company's underlying fundamentals have been the driver of long term performance, or if there are some discrepancies.

See our latest analysis for Rambus

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 way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During the last half decade, Rambus became profitable. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here. Since the company was unprofitable five years ago, but not three years ago, it's worth taking a look at the returns in the last three years, too. Indeed, the Rambus share price has gained 101% in three years. During the same period, EPS grew by 919% each year. This EPS growth is higher than the 26% average annual increase in the share price over the same three years. So you might conclude the market is a little more cautious about the stock, these days.

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

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

A Different Perspective

Investors in Rambus had a tough year, with a total loss of 17%, against a market gain of about 28%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. On the bright side, long term shareholders have made money, with a gain of 31% per year over half a decade. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. 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. Consider for instance, the ever-present spectre of investment risk. We've identified 2 warning signs with Rambus , and understanding them should be part of your investment process.

But note: Rambus may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

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.