Companies love to talk about how much they are investing. Investors want to know a simpler thing: is that money earning a decent return? The most widely used measure for answering that question is return on invested capital, usually shortened to ROIC. When spending is surging, as it is across much of the technology sector, it becomes one of the most important numbers to understand.
What ROIC is
Return on invested capital measures how much profit a company generates from the money invested in its business. That money comes from both shareholders and lenders, and is used to buy things like buildings, equipment, data centres and working capital. The basic formula is operating profit after tax divided by invested capital. If a company makes £15 million of after-tax operating profit on £100 million of invested capital, its ROIC is 15 per cent.
Why it matters
ROIC tells you whether a company is creating value. The key comparison is with the cost of capital, which is what the company pays for its money. If ROIC is higher than the cost of capital, every pound invested adds value. If it is lower, the company is growing but destroying value, a bit like borrowing at 8 per cent to earn 5 per cent.
Companies with consistently high ROIC tend to have strong competitive advantages, such as a powerful brand, network effects or low costs. Many of the market’s best long-term performers have been businesses that could reinvest large sums at high returns for many years.
Why it matters now
When companies dramatically increase their investment, as many technology giants have done to build AI capacity, invested capital rises quickly. If profits rise at the same pace, ROIC holds steady. If profits lag behind, ROIC falls, at least for a while. That is the heart of many debates about AI spending: investors are trying to judge whether the eventual returns will justify the huge sums going in, and how long they will have to wait.
A simple example
Imagine a company with £1 billion of invested capital earning £200 million, a ROIC of 20 per cent. It decides to invest another £1 billion. If the new investment earns £200 million too, ROIC stays at 20 per cent and profits double. If the new investment earns only £50 million in its first few years, total profit is £250 million on £2 billion, and ROIC falls to 12.5 per cent. The company is bigger, but the quality of its returns has dropped, and the share price may reflect that.
How traders use it
Investors compare ROIC across companies in the same sector and track it over time. A rising ROIC suggests investments are paying off. A falling ROIC during a spending boom raises questions. Traders also listen for how management talks about returns on new projects, because a company that cannot explain its expected returns is asking investors to take a lot on trust.
Common mistakes
One mistake is relying on ROIC for a single year, because big investments can depress it temporarily before paying off. Another is comparing ROIC across very different industries, where normal levels vary widely. A third is ignoring how companies calculate it, as definitions of invested capital differ.
The bottom line
ROIC tells you whether a company’s investments are earning more than they cost. In periods of heavy spending, it is the measure that separates growth that creates value from growth that does not. If you want to test how you weigh numbers like this, take the free Samuel & Co Trading Trader Assessment.
