When bond yields climb, the whole stock market can feel the pressure, but some corners feel it more than others. Smaller companies are often among the first to suffer. This week, with the US 10-year Treasury yield at its highest level since 2002, the Russell 2000 index of smaller US companies fell more sharply than the large-company benchmarks on Wednesday. That pattern is common, and the reasons behind it are worth understanding.
What small caps are
Small-cap stocks are shares in companies with a relatively small stock market value, or market capitalisation. In the US, the Russell 2000 is the best-known small-cap index. In the UK, the FTSE 250 contains mid-sized companies, and the FTSE SmallCap index covers smaller ones still. Our guide to stock indices explains how these benchmarks are built.
Smaller companies can offer faster growth, but they also tend to be more sensitive to economic and financial conditions than large, established businesses.
Borrowing costs bite harder
The biggest reason small caps struggle when yields rise is debt. Smaller companies often rely more on bank loans and other borrowing that is linked to short-term interest rates or needs refinancing relatively soon. When yields and rates rise, their interest bills can go up quickly.
Large companies, by contrast, often have more cash, easier access to bond markets and debt that was locked in at lower rates for many years. They are better placed to wait out a period of high borrowing costs.
A larger share of smaller companies also make little or no profit. For those firms, rising financing costs can squeeze already thin margins or make it harder to raise new money at all.
Valuations come under pressure
Higher yields also change how investors value future profits. When safe government bonds offer a better return, investors demand more from riskier assets. Profits expected far in the future are worth less in today’s money. Growth-oriented small companies, whose value often rests on future earnings, can be hit particularly hard. Our explainer on how higher real yields pressure growth stocks covers this effect in more detail.
They are more tied to the domestic economy
Small companies usually earn most of their revenue at home. That makes them more exposed to the health of their domestic economy. If higher rates are expected to slow spending, hiring and investment, small caps can be among the first to reflect those fears. Large multinationals, with sales spread around the world, can be partly cushioned.
Investors become more cautious
When markets turn nervous, investors often move towards larger, more liquid companies that are easier to trade in size. Smaller shares can see wider spreads between buying and selling prices and sharper moves when sentiment changes. This preference for size can add to the pressure during periods of rising yields.
It is not always the case
Small caps do not always lose when yields rise. If yields are climbing because the economy is growing strongly, smaller companies can benefit from rising demand. The question is why yields are rising. Yields driven by strong growth can be manageable. Yields driven by stubborn inflation, heavy government borrowing or fears that central banks will keep rates high are more of a problem.
This is part of a wider pattern in which different types of shares take turns leading the market as rates change. Our piece on how growth versus value rotates when yields rise explores that rotation.
What traders watch
Traders often compare small caps with large caps to gauge the market’s mood. When small caps lag badly, it can suggest investors are worried about borrowing costs or growth. When they lead, it can indicate confidence that the economy can handle current rates. Watching the gap between the Russell 2000 and the S&P 500, or the FTSE 250 and the FTSE 100, can add useful context to a wider market view.
The takeaway
Small-cap stocks tend to struggle when yields rise because they carry more short-term debt, depend more on future profits and the domestic economy, and fall out of favour when investors become cautious. The reason yields are rising matters as much as the move itself.
If you want to understand how interest rates shape the markets you trade, our free trader assessment can show you where to focus your learning next.
