Every results season there is a number that can move a share price more than profits themselves, and it is not always on the front page of the report. Capital expenditure, usually shortened to capex, tells you how much a company is pouring into its own future. In the current market, with technology giants spending tens of billions on artificial intelligence, it has become one of the most watched figures of all.
What capital expenditure means
Capital expenditure is money a company spends on long-lasting assets: buildings, factories, machinery, computer servers, data centres, vehicles and the like. These are things expected to be used for years, not consumed in a single quarter. That makes capex different from operating expenses such as wages, rent and marketing, which are the day-to-day costs of running the business.
The accounting treatment reflects that difference. Operating costs go straight through the income statement and reduce profit immediately. Capex is recorded on the balance sheet as an asset and then gradually charged against profit over its useful life through depreciation. So a company can spend heavily on capex this year without it fully hitting this year’s earnings.
Where to find it
Capex sits in the cash flow statement, usually under investing activities, often labelled purchases of property, plant and equipment. Many large companies also give a capex forecast for the year ahead in their guidance, and that forecast is often what traders react to on results day.
Why capex matters to investors
Capex is a statement of confidence. A company spending more is betting that demand will be there to justify new capacity. When a management team raises its capex plan, it is saying it sees opportunities worth investing in. When it cuts, it may be protecting cash, or it may be signalling that it sees less demand ahead.
The catch is that capex reduces the cash available to shareholders today. Free cash flow is roughly operating cash flow minus capex, so a big jump in spending can wipe out free cash flow even when the business is growing strongly. Our guide to free cash flow explains why that measure matters so much for valuations.
Capex and the AI boom
The AI buildout has turned capex into a headline number. The largest technology companies are spending enormous sums on chips, servers and data centres, and investors are trying to judge whether the revenue will follow. That creates a tricky reaction function. Raise spending and the market may worry about returns. Cut spending and it may worry about lost ambition. Results days can therefore swing sharply on capex guidance alone.
Capex also has knock-on effects. One company’s capital expenditure is another company’s revenue. When hyperscalers spend more, chipmakers, equipment suppliers, power companies and construction firms benefit. That is why a single capex announcement can move shares across an entire supply chain.
How to read capex as a beginner
Start by comparing capex with operating cash flow. If spending regularly exceeds the cash the business generates, the company is funding the difference through borrowing, issuing shares or running down its cash pile. That can be fine for a while, but it cannot continue indefinitely.
Next, look at the trend in capex intensity, which is capex as a share of revenue. Rising intensity means the company needs more investment to produce each pound or dollar of sales. Then ask what the spending is for. Maintenance capex keeps existing operations running; growth capex builds new capacity. Growth capex is easier to justify if returns follow, which is why management commentary on expected returns matters.
Common mistakes
The first mistake is treating all spending as bad news. Companies that never invest tend to stagnate. The second is assuming every pound of capex will earn a return. History is full of industries that overbuilt capacity, from railways to telecoms, and shareholders paid the price. The third is ignoring depreciation: today’s capex becomes tomorrow’s charge against profits.
Capex is ultimately a test of judgment, for companies and for traders reading their numbers. If you want to see how clearly you weigh evidence like this before making decisions, take the free Samuel & Co Trading Trader Assessment and find out where your process is strong and where it needs work.
