What trends should we look for it we want to identify stocks that can multiply in value over the long term? One common approach is to try and find a company with returns on capital employed (ROCE) that are increasing, in conjunction with a growing amount of capital employed. Put simply, these types of businesses are compounding machines, meaning they are continually reinvesting their earnings at ever-higher rates of return. Although, when we looked at Diodes (NASDAQ:DIOD), it didn't seem to tick all of these boxes.

Understanding Return On Capital Employed (ROCE)

If you haven't worked with ROCE before, it measures the 'return' (pre-tax profit) a company generates from capital employed in its business. The formula for this calculation on Diodes is:

Return on Capital Employed = Earnings Before Interest and Tax (EBIT) ÷ (Total Assets - Current Liabilities)

0.029 = US$59m ÷ (US$2.4b - US$353m) (Based on the trailing twelve months to September 2024).

Therefore, Diodes has an ROCE of 2.9%. In absolute terms, that's a low return and it also under-performs the Semiconductor industry average of 8.6%.

In the above chart we have measured Diodes' prior ROCE against its prior performance, but the future is arguably more important. If you're interested, you can view the analysts predictions in our free analyst report for Diodes .

How Are Returns Trending?

In terms of Diodes' historical ROCE movements, the trend isn't fantastic. To be more specific, ROCE has fallen from 14% over the last five years. And considering revenue has dropped while employing more capital, we'd be cautious. This could mean that the business is losing its competitive advantage or market share, because while more money is being put into ventures, it's actually producing a lower return - "less bang for their buck" per se.

The Key Takeaway

We're a bit apprehensive about Diodes because despite more capital being deployed in the business, returns on that capital and sales have both fallen. Despite the concerning underlying trends, the stock has actually gained 14% over the last five years, so it might be that the investors are expecting the trends to reverse. Regardless, we don't like the trends as they are and if they persist, we think you might find better investments elsewhere.

If you want to continue researching Diodes, you might be interested to know about the 2 warning signs that our analysis has discovered.

If you want to search for solid companies with great earnings, check out this free list of companies with good balance sheets and impressive returns on equity.

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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.