Semiconductors: The Layer Every AI Dollar Flows Through

Every data center, every AI accelerator, every autonomous vehicle starts with a wafer. Taiwan Semiconductor Manufacturing fabricates the vast majority of the world's most advanced chips, making it the single most important chokepoint in global technology supply. That position is not shrinking — it's hardening, because the capital required to build a leading-edge fab now runs into the tens of billions and the learning curves take years to compress.

The semiconductors theme captures 81 companies across the full stack: foundries, equipment suppliers, materials specialists, test-and-measurement firms, and the connective tissue that links chips to systems. The argument for the theme isn't a single company — it's the toll-road structure of the industry itself.

Equipment Suppliers Earn Revenue Before a Chip Ever Ships

Fab construction triggers equipment spending first. KLA Corp dominates process control — the inspection and metrology tools fabs use to catch defects at each layer of a wafer. Lam Research leads in etch and deposition equipment, the steps that physically build transistor structures. Applied Materials spans deposition, etch, and chemical mechanical planarization. None of these companies need to win a design competition or secure a hyperscaler contract. They get paid when capacity gets built, and capacity is being built aggressively across the US, Japan, and Europe as governments subsidize onshore fabrication.

Entegris operates one layer deeper still — supplying the ultra-pure chemicals, filtration systems, and advanced materials that fabs consume continuously. Every wafer start is a recurring revenue event for materials suppliers, which gives Entegris a consumption model rather than a lumpy capital-goods model.

The Interconnect and Test Layer Is Quietly Indispensable

As chip architectures shift toward chiplets and advanced packaging, the components that move signals between chips gain importance. Broadcom designs custom AI networking chips and high-speed interconnects that hyperscalers embed directly into their infrastructure — its custom ASIC business is one of the fastest-growing franchises in the sector. Amphenol supplies the connectors and cable assemblies that link chips to boards to systems; it sits at the intersection of semiconductors and every major end market from data centers to defense.

Teradyne runs the test side — its automated test equipment validates chips after fabrication, and its robotics division adds a second growth vector tied to factory automation. Coherent Corp supplies the laser and optical components increasingly embedded in transceivers for AI data center interconnects, a market expanding rapidly as GPU clusters demand higher bandwidth between nodes.

On the storage side, Western Digital produces the NAND flash that underlies solid-state storage — a market recovering from a deep inventory correction and now tightening again as AI inference workloads drive demand for fast, dense storage.

Intel Remains the Highest-Stakes Turnaround in the Theme

Intel is the wild card. It is simultaneously a chip designer, a foundry trying to compete with TSMC, and a recipient of CHIPS Act subsidies. Its manufacturing roadmap has slipped repeatedly, but its scale — in x86 CPUs, data center chips, and now foundry services — means it cannot be ignored. A successful process recovery would shift competitive dynamics across the entire theme. A continued slide pushes more design wins toward TSM and accelerates the fabless model.

For exposure to the theme with amplified sensitivity to near-term momentum, the ETF library includes SOXL, the Direxion 3x leveraged semiconductor ETF — a trading instrument, not a long-term hold, but a useful signal of where speculative positioning sits at any given moment.

The structural case for semiconductors doesn't rest on a single product cycle. It rests on the fact that every major technology transition — AI, electrification, defense modernization, industrial automation — requires more silicon, more advanced packaging, and more capital equipment to produce it.