Semi Fab&Test
The Factories Behind Every AI Chip | Updated April 2026
Where Semi Fab&Test Sits in the Supply Chain
Foundries (TSMC, Intel, GlobalFoundries, Tower) etch the silicon and OSAT packagers (ASE, Amkor) assemble and test it — the capital-intensive manufacturing layer every fabless chip designer depends on.
The Problem
AI chips are only as good as the factories that build them. Turning a design into working silicon takes fabs that cost $10–20 billion and years to build, plus advanced packaging to stitch the pieces together.
The Solution
These companies physically make and package the world’s chips. Foundries (TSMC, Intel, GlobalFoundries, Tower) fabricate the silicon; OSAT firms (ASE, Amkor) assemble, package and test it for every fabless designer.
Why It Matters Now
AI demand has leading-edge fabs and advanced-packaging (CoWoS) lines sold out through 2027 — capacity, not chip design, is the bottleneck. US/EU reshoring (CHIPS) and China export controls are redrawing the map.
TSM
TSMC
World’s largest pure-play foundry. Manufactures the leading-edge chips for NVIDIA, Apple and AMD; CoWoS advanced packaging is the key AI bottleneck.
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INTC
Intel
Legacy CPU leader pivoting to contract manufacturing. Its 18A node and Intel Foundry aim to win outsourced production and regain process leadership from TSMC.
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ASX
ASE Technology
World’s largest OSAT (outsourced assembly & test). Packages and tests chips for NVIDIA, AMD and most fabless designers; advanced-packaging leader for AI.
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AMKR
Amkor Technology
#2 global OSAT and largest US-based. Advanced 2.5D/SWIFT packaging for AI accelerators; building a major Arizona campus for US-made packaging.
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GFS
GlobalFoundries
Specialty foundry for RF, power and automotive chips. Exited leading-edge to focus on differentiated US/EU-made silicon and silicon photonics.
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TSEM
Tower Semiconductor
Specialty analog foundry and the leading silicon-photonics maker — the optical chips inside AI data centers; RF, power and sensor processes.
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Source: SEC EDGAR annual and quarterly filings, company earnings conference calls and presentations.
Disclaimer: This page is for educational purposes only. NO investment advice.