Most readers would already be aware that Diploma's (LON:DPLM) stock increased significantly by 22% over the past three months. Since the market usually pay for a company’s long-term fundamentals, we decided to study the company’s key performance indicators to see if they could be influencing the market. Specifically, we decided to study Diploma's  ROE in this article.

Return on Equity or ROE is a test of how effectively a company is growing its value and managing investors’ money. Simply put, it is used to assess the profitability of a company in relation to its equity capital.

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How To 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 Diploma is:

18% = UK£168m ÷ UK£948m (Based on the trailing twelve months to March 2025).

The 'return' refers to a company's earnings over the last year. So, this means that for every £1 of its shareholder's investments, the company generates a profit of £0.18.

View our latest analysis for Diploma

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. Depending on how much of these profits the company reinvests or "retains", and how effectively it does so, we are then able to assess a company’s earnings growth potential. Generally speaking, other things being equal, firms with a high return on equity and profit retention, have a higher growth rate than firms that don’t share these attributes.

Diploma's Earnings Growth And 18% ROE

To start with, Diploma's ROE looks acceptable. On comparing with the average industry ROE of 12% the company's ROE looks pretty remarkable. This certainly adds some context to Diploma's exceptional 23% net income growth seen over the past five years. We believe that there might also be other aspects that are positively influencing the company's earnings growth. For instance, the company has a low payout ratio or is being managed efficiently.

We then compared Diploma's net income growth with the industry and we're pleased to see that the company's growth figure is higher when compared with the industry which has a growth rate of 14% in the same 5-year period.LSE:DPLM Past Earnings Growth June 20th 2025

The basis for attaching value to a company is, to a great extent, tied to its earnings growth. What investors need to determine next is if the expected earnings growth, or the lack of it, is already built into the share price. This then helps them determine if the stock is placed for a bright or bleak future. If you're wondering about Diploma's's valuation, check out this gauge of its price-to-earnings ratio, as compared to its industry.

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Is Diploma Making Efficient Use Of Its Profits?

The high three-year median payout ratio of 64% (implying that it keeps only 36% of profits) for Diploma suggests that the company's growth wasn't really hampered despite it returning most of the earnings to its shareholders.

Besides, Diploma has been paying dividends for at least ten years or more. This shows that the company is committed to sharing profits with its shareholders. Upon studying the latest analysts' consensus data, we found that the company's future payout ratio is expected to drop to 35% over the next three years. The fact that the company's ROE is expected to rise to 23% over the same period is explained by the drop in the payout ratio.

Summary

Overall, we are quite pleased with Diploma's performance. We are particularly impressed by the considerable earnings growth posted by the company, which was likely backed by its high ROE. While the company is paying out most of its earnings as dividends, it has been able to grow its earnings in spite of it, so that's probably a good sign. With that said, the latest industry analyst forecasts reveal that the company's earnings growth is expected to slow down. Are these analysts expectations based on the broad expectations for the industry, or on the company's fundamentals? Click here to be taken to our analyst's forecasts page for the company.

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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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