Semiconductor Equipment Stocks

The machines that make chips, and why so few companies make them

Every chip in existence was made by a machine, and the companies that build those machines occupy one of the most concentrated positions in modern industry. Several of the critical process steps have effectively one qualified supplier worldwide. That concentration exists because a fabrication tool takes a decade to develop, must be qualified inside a customer's process before it sells a single unit, and then stays in that fab for fifteen years generating service and parts revenue.

Lithography prints the circuit pattern onto the wafer and sets the smallest feature the process can achieve. It is the most complex and most expensive tool in the fab, and the transition to extreme ultraviolet light is what made the current generation of logic possible. This is the single most concentrated step in the entire supply chain.

Deposition lays down films atoms at a time, building the layered structure of a transistor. Etch removes material with equal precision to carve the pattern the lithography defined. As transistors moved from flat structures to three dimensional ones, the number of deposition and etch steps per wafer rose sharply, which is why these two categories captured a growing share of total equipment spending.

Ion implantation drives dopants into silicon to set its electrical properties. Process control and metrology inspects and measures at every stage: at these dimensions a defect invisible to any optical microscope can ruin an entire wafer, and inspection is what converts a working process into a profitable yield.

Beneath the toolmakers sits a subsystem and materials layer that most people never see: vacuum and gas delivery systems, radio frequency power supplies, precision motion assemblies, and the ultra pure chemicals and filtration that keep contamination out. These suppliers sell into the toolmakers and often into the fabs directly, and their revenue tracks equipment shipments with a lag.

Two forces set the cycle. Capital spending by chipmakers is lumpy, decided years ahead and revised when demand shifts, so equipment orders amplify the semiconductor cycle rather than smoothing it. And export controls are now a first order variable: rules on which tools may be sold to which countries can remove a substantial revenue stream with a single policy change.

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