The Print Shops — Wafer Fabrication
Designing a chip is the easy part. Printing it is where the bottleneck lives.
Once you have raw silicon and rare materials, you need a $15-20 billion factory ('foundry') and a fleet of giant machines to print the chip onto a wafer. The lithography step alone uses a $400 million machine that only one company on Earth makes . Then the wafer goes through hundreds more steps — etching tiny trenches, depositing thin films, inspecting for defects. The companies that make these machines (ASML, Applied Materials, Lam, KLA) and the foundry that runs them (TSMC) are the most consolidated chokepoint in the entire chain.
The whole AI buildout runs at the speed of the slowest fab tool. There are no second sources for any of these five names.
6 names on the watchlist
EUV lithography — the absolute monopoly
ASML is the Dutch company that makes the $400 million machines required to print modern chips . There is exactly one supplier on Earth. Every Rubin GPU, every HBM4 die, every advanced AI chip passes through an ASML machine. The original 'narrow place' of the entire AI thesis.
The world's foundry — where the chips are actually printed
TSMC actually manufactures the chips that NVIDIA, AMD, Apple, and Broadcom design. They control roughly 70% of the world's leading-edge chip output and run the entire CoWoS advanced-packaging pipeline that NVIDIA's GPUs require. There is no second source.
Etch + deposition for HBM and 3D NAND
Lam makes the machines that carve out the tiny vertical tunnels (called 'TSVs') that connect stacked memory chips . Every layer added to a memory tower means more passes through Lam's machines. Reportedly also a suitor for BESI.
Process control — the chip industry's quality cop
KLA makes the inspection machines that check chips for defects at every step of manufacturing. As packages get more complex (3D, hybrid bonded), defect rates explode and KLA tools become more critical. Near-monopoly in process control.
Largest U.S. chip-equipment maker
The biggest U.S. chip-equipment company. They own 9% of BESI (the hybrid-bonder monopoly) and partner with them on the integrated 'Kinex' system. You're not just buying equipment — you're buying optionality on the BESI relationship and leadership in the next inflection (Gate-All-Around transistors, HBM, 3D-DRAM).
Glass-substrate laser drilling — niche monopoly
German company specializing in the laser systems used to drill holes through glass substrates — the next-generation replacement for the organic substrates in today's AI chip packages. Glass substrates promise better thermal performance and tighter chip stacking. Intel, TSMC, and other foundries are all moving toward glass for next-gen packaging. Called out by @aleabitoreddit before its run. Small-cap European, illiquid for U.S. retail.
- Dylan Bristot, AI Bottlenecks · whatllm.org · May 2026