FTSE 100 investors! 2 ratios I’d consider when analysing shares

Let’s look at two financial ratios FTSE 100 (INDEXFTSE: UKX) investors can use to analyse their holdings.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Whether a company is a good long-term investment usually comes down to both qualitative and quantitative factors. Using multiples can be an important quantitative tool to ensure you don’t overpay for an investment. 

What do a few other pieces of data tell us about stocks and can we glean a buy or sell signal from them? Today I’d like to discuss two metrics that may help interested readers analyse shares.

Return on equity

Return on equity (ROE) is a profitability ratio that is used to assess how efficient and productive a company is with its money.

The formula is derived by dividing a company’s net income by its share capital base. In other words, it measures how much a company is earning relative to the money it keeps within the business.

It is expressed as a percentage, such as 18%. That would mean that for every £1 worth of shareholders’ equity, the company has generated 18p in net income.

A higher ROE indicates that management is more effective at converting capital into profit. My own rule of thumb is to look for ROEs above 15% as I screen for investments. I’d also like to see that the company consistently provides a high return on equity over many years.

Investors may also use ROE to compare rivals in a given industry. So, all else being equal, a high ROE is better than a low one.

Consumer goods giant Unilever has an impressive ROE of 76%. By comparison, that of Reckitt Benckiser currently stands at 16%.

Debt-to-equity ratio

For most companies, debt is an important reality of running a business as they may need to borrow for a variety of reasons. Building or growing a business requires investment capital.

Therefore, looking at the ROE alone may not always always suffice, as high debt levels may boost a company’s ROE and give the illusion that the business is generating high returns. 

However, debt may also mean increased level of risk for the company. With increased risk, investors would like to see increased returns.

If the cost of debt financing outweighs the increased returns generated, then investors may be alarmed and sell a company’s shares. 

Investors therefore also need to look at the debt-to-equity ratio in order to ascertain if debt levels might be too high with respect to the share capital of the company. This metric is a leverage or gearing ratio that shows whether a company’s capital structure is tilted toward debt or equity financing. 

It also varies across industries. A ratio of 0.75 means that creditors provide 75p for each pound provided by shareholders to finance the assets. A high debt-to-equity ratio generally means that a company has aggressively financed its growth with debt.

Unilever has a debt-to-equity ratio of 2.2. Thus it’s worth noting the significant use of debt by Unilever. Its high ROE has clearly benefited from the group’s use of debt.

Reckitt Benckiser’s debt-to-equity is about 1, which highlights that creditors and shareholders equally contribute to its assets.

The Foolish takeaway

So which company would be a better investment? Both have their supporters and the answer depends on several factors, including your personal risk/return profile and investment horizon.

Although ROE and debt-to-equity can be useful metrics, they are only a small part of diligent research. I’d encourage you to do further due diligence on both companies.

tezcang has no position in any of the shares mentioned. The Motley Fool UK owns shares of and has recommended Unilever. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Close-up of British bank notes
Investing Articles

£20,000 for a Stocks and Shares ISA? Here’s how to try and turn it into a monthly passive income of £493

Hundreds of pounds in passive income a month from a £20k Stocks and Shares ISA? Here's how that might work…

Read more »

Snowing on Jubilee Gardens in London at dusk
Investing Articles

£5,000 put into Nvidia stock last Christmas is already worth this much!

A year ago, Nvidia stock was already riding high -- but it's gained value since. Our writer explores why and…

Read more »

Investing Articles

Are Tesco shares easy money heading into 2026?

The supermarket industry is known for low margins and intense competition. But analysts are bullish on Tesco shares – and…

Read more »

Smiling black woman showing e-ticket on smartphone to white male attendant at airport
Investing Articles

Can this airline stock beat the FTSE 100 again in 2026?

After outperforming the FTSE 100 in 2025, International Consolidated Airlines Group has a promising plan to make its business more…

Read more »

Investing Articles

1 Stocks and Shares ISA mistake that will make me a better investor in 2026

All investors make mistakes. The best ones learn from them. That’s Stephen Wright’s plan to maximise returns from his Stocks…

Read more »

Portrait Of Senior Couple Climbing Hill On Hike Through Countryside In Lake District UK Together
Investing Articles

I asked ChatGPT if £20,000 would work harder in an ISA or SIPP in 2026 and it said…

Investors have two tax-efficient ways to build wealth, either in a Stocks and Shares ISA or SIPP. Harvey Jones asked…

Read more »

Investing Articles

How much would I need invested in an ISA to earn £2,417 a month in passive income?

This writer runs the numbers to see what it takes in an ISA to reach £2,417 a month in passive…

Read more »

Investing Articles

Rolls-Royce shares or Melrose Industries: Which one is better value for 2026?

Rolls-Royce shares surged in 2025, surpassing most expectations. Dr James Fox considers whether it offers better value than peer Melrose.

Read more »