WFE spending is surging past $140B in 2026 with 2027 already at $170-180B -- advanced packaging at 50%+ growth is the fastest-growing sub-segment as the defining constraint shifts from lithography to back-end integration

Wafer fab equipment spending has entered a structural regime shift driven by AI fab buildouts across logic, memory, and packaging simultaneously. LRCX, KLAC, AMAT, and ASML all guided to upside scenarios for 2026, and MKS Instruments is already ordering equipment for a 2027 WFE environment of $170-180B. ASML confirmed memory customers are 'sold out for 2026 and their supply constraint will last beyond 2026.' TSMC is pushing capex toward the high end of $52-56B. Micron's capex is rising above $25B. Advanced packaging has emerged as the fastest-growing equipment segment at 50%+ growth rates across multiple companies. KLAC is targeting $1B in packaging process control alone and gained 14 points of packaging share. CAMT has $260M in HBM-specific orders. ASX's LEAP revenue is doubling to $3.2B. The NAND upgrade supercycle adds another layer: $40B in conversion spending is being pulled forward to before end-2027, with LRCX as the primary beneficiary as record-of-record at all leading memory makers. The leading-edge foundry/logic wave is now broad-based across TSMC, Intel (18A yields running ahead of projections), and Samsung simultaneously. AMAT attributes 80%+ of WFE growth to foundry logic, DRAM, and advanced packaging. Gate-all-around transistor architecture is driving new equipment intensity across etch, deposition, metrology, and flow control. The equipment service and installed-base businesses are compounding at mid-teens CAGRs, creating a structural margin expansion story the market is underpricing.