Semiconductor stocks have delivered some of the market’s biggest gains over the long run, but the path has been anything but smooth. The industry is famous for cycles in which shortages lead to heavy investment, which leads to oversupply, falling prices, and cutbacks, until demand catches up and the cycle starts again.
Why the industry is cyclical
The root cause is a timing mismatch. Demand for chips can change quickly as consumers buy more or fewer phones and PCs, businesses adjust IT budgets, or a new technology such as AI takes off. Supply, by contrast, changes slowly. Building a new fabrication plant costs billions of dollars and takes years, and once it is running, the high fixed cost gives manufacturers every incentive to keep producing.
When demand surges, shortages develop, prices rise, and companies announce new capacity. By the time that capacity arrives, demand may have cooled, leaving too much supply.
The role of inventory
Inventory amplifies the cycle. During shortages, customers order more than they need to secure supply, a behavior sometimes called double ordering. When supply catches up, those customers discover they are holding too much inventory and cut orders sharply while they work it down. Chipmakers can see a sudden drop in orders even if end demand has only slowed modestly.
Not all chips are equally cyclical
- Memory (DRAM and NAND flash): the most cyclical segment. Products from different makers are largely interchangeable, so prices swing with supply and demand, and profits can move from very high to losses within a year or two.
- Logic and processors: more differentiated products give designers more pricing power, although they are still exposed to demand swings.
- Analog and power chips: used in cars and industrial equipment, with long product lives and many customers, typically less volatile but still cyclical.
- Semiconductor equipment: depends on chipmakers’ capital spending, which tends to rise late in upcycles and fall sharply in downturns.
Signals investors watch
- Inventory days at chipmakers and their customers. Rising inventories relative to sales are an early warning.
- Lead times: how long customers must wait for orders. Stretching lead times signal tightness; shrinking lead times signal loosening.
- Memory pricing: contract and spot prices for DRAM and NAND.
- Capital spending plans: aggressive capacity additions across the industry can sow the seeds of the next glut.
- Industry sales data: trade groups publish monthly global semiconductor sales figures.
Why chip stocks often move before the numbers
Semiconductor stocks tend to anticipate the cycle. They often bottom while earnings are still falling and peak while earnings are still rising, because investors look ahead to where the cycle will be in six to twelve months. This can make chip stocks look expensive on current earnings at the bottom and cheap at the top, the opposite of what a simple P/E screen suggests.
Is AI different?
AI-driven data center demand has created a new, very large source of chip demand, and some argue it has changed the industry’s structure. Even so, the same dynamics of concentrated customers, capacity expansions, and inventory can still apply. Read more in what drives AI chip demand.
