Rambus (NASDAQ:RMBS) has had a rough week with its share price down 23%. However, stock prices are usually driven by a company's financial performance over the long term, which in this case looks quite promising. Particularly, we will be paying attention to Rambus' ROE today.

Return on equity or ROE is an important factor to be considered by a shareholder because it tells them how effectively their capital is being reinvested. In other words, it is a profitability ratio which measures the rate of return on the capital provided by the company's shareholders.

How Is ROE Calculated?

The formula for return on equity is:

Return on Equity = Net Profit (from continuing operations) ÷ Shareholders' Equity

So, based on the above formula, the ROE for Rambus is:

22% = US$231m ÷ US$1.0b (Based on the trailing twelve months to June 2024).

The 'return' is the yearly profit. One way to conceptualize this is that for each $1 of shareholders' capital it has, the company made $0.22 in profit.

Why Is ROE Important For Earnings Growth?

We have already established that ROE serves as an efficient profit-generating gauge for a company's future earnings. We now need to evaluate how much profit the company reinvests or "retains" for future growth which then gives us an idea about the growth potential of the company. Assuming everything else remains unchanged, the higher the ROE and profit retention, the higher the growth rate of a company compared to companies that don't necessarily bear these characteristics.

Rambus' Earnings Growth And 22% ROE

First thing first, we like that Rambus has an impressive ROE. Second, a comparison with the average ROE reported by the industry of 15% also doesn't go unnoticed by us. As a result, Rambus' exceptional 80% net income growth seen over the past five years, doesn't come as a surprise.

As a next step, we compared Rambus' net income growth with the industry, and pleasingly, we found that the growth seen by the company is higher than the average industry growth of 30%.

Earnings growth is an important metric to consider when valuing a stock. The investor should try to establish if the expected growth or decline in earnings, whichever the case may be, is priced in. Doing so will help them establish if the stock's future looks promising or ominous. If you're wondering about Rambus''s valuation, check out this gauge of its price-to-earnings ratio, as compared to its industry.

Is Rambus Using Its Retained Earnings Effectively?

Rambus doesn't pay any regular dividends to its shareholders, meaning that the company has been reinvesting all of its profits into the business. This is likely what's driving the high earnings growth number discussed above.

Conclusion

In total, we are pretty happy with Rambus' performance. Specifically, we like that the company is reinvesting a huge chunk of its profits at a high rate of return. This of course has caused the company to see substantial growth in its earnings. That being so, a study of the latest analyst forecasts show that the company is expected to see a slowdown in its future earnings growth. To know more about the company's future earnings growth forecasts take a look at this free report on analyst forecasts for the company to find out more.

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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.

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