Lam Research Corporation

Lam Research Corporation is a global supplier of wafer fabrication equipment and services to the semiconductor industry, with core competencies in deposition, etch, and clean — the three fundamental process steps repeated hundreds of times to build every advanced chip. The company generated $18.4 billion in revenue in fiscal 2025, serving memory, foundry, and logic manufacturers whose products power everything from AI training clusters to mobile phones.

This is a story about an indispensable vendor to an industry in the midst of its largest-ever capital cycle. Lam sits at the center of the AI infrastructure buildout: every leading-edge logic chip and every stack of high-bandwidth memory passes through its tools. The company's financial model has been extraordinary — 32% operating margins, cash flow that comfortably funds an annual $4.6 billion capital return program, and a balance sheet that carries more cash than debt. The question the file turns on is not whether Lam is a quality business but how much of the current cycle is already priced into a stock trading above 45 times trailing earnings.

That question matters because Lam's history is inseparable from the semiconductor industry's violent cycles. Revenue fell 14% in fiscal 2024; it grew 24% in fiscal 2025. China represented 34% of revenue in fiscal 2025 — a concentration that U.S. export controls have made a live political variable. The file examines the durability of Lam's technology position, the resilience of its financial model through a downturn, and what the current valuation asks an investor to believe about the trajectory of wafer fabrication equipment spending over the next several years.