Most readers would already be aware that Ciena's (NYSE:CIEN) stock increased significantly by 35% over the past three months. But the company's key financial indicators appear to be differing across the board and that makes us question whether or not the company's current share price momentum can be maintained. Specifically, we decided to study Ciena's ROE in this article.

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 short, ROE shows the profit each dollar generates with respect to its shareholder investments.

Check out our latest analysis for Ciena

How Do You Calculate Return On Equity?

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 Ciena is:

3.0% = US$84m ÷ US$2.8b (Based on the trailing twelve months to November 2024).

The 'return' is the profit over the last twelve months. Another way to think of that is that for every $1 worth of equity, the company was able to earn $0.03 in profit.

What Is The Relationship Between ROE And Earnings Growth?

Thus far, we have learned that ROE measures how efficiently a company is generating its profits. Based on how much of its profits the company chooses to reinvest or "retain", we are then able to evaluate a company's future ability to generate profits. 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.

Ciena's Earnings Growth And 3.0% ROE

As you can see, Ciena's ROE looks pretty weak. Even compared to the average industry ROE of 13%, the company's ROE is quite dismal. Given the circumstances, the significant decline in net income by 17% seen by Ciena over the last five years is not surprising. We believe that there also might be other aspects that are negatively influencing the company's earnings prospects. Such as - low earnings retention or poor allocation of capital.

That being said, we compared Ciena's performance with the industry and were concerned when we found that while the company has shrunk its earnings, the industry has grown its earnings at a rate of 6.4% in the same 5-year period.

The basis for attaching value to a company is, to a great extent, tied to its earnings growth. 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. One good indicator of expected earnings growth is the P/E ratio which determines the price the market is willing to pay for a stock based on its earnings prospects. So, you may want to check if Ciena is trading on a high P/E or a low P/E, relative to its industry.

Is Ciena Efficiently Re-investing Its Profits?

Ciena doesn't pay any regular dividends, meaning that potentially all of its profits are being reinvested in the business, which doesn't explain why the company's earnings have shrunk if it is retaining all of its profits. So there might be other factors at play here which could potentially be hampering growth. For example, the business has faced some headwinds.

Summary

On the whole, we feel that the performance shown by Ciena can be open to many interpretations. Even though it appears to be retaining most of its profits, given the low ROE, investors may not be benefitting from all that reinvestment after all. The low earnings growth suggests our theory correct. Having said that, looking at current analyst estimates, we found that the company's earnings growth rate is expected to see a huge improvement. 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.