SUMCO
A focused silicon-wafer manufacturer supplying the high-purity substrates on which semiconductor circuits are fabricated.
Company Snapshot
- Founded
- 1999
- Headquarters
- 1-2-1 Shibaura, Minato-ku, Tokyo 105-8634, Japan
- Capital
- ¥199.0 billion
- Latest net sales
- ¥409.6 billionFY ended December 2025, consolidated
- Primary focus
- Semiconductor silicon wafers
- Value-chain position
- Upstream wafer substrates
Head Office
1-2-1 Shibaura, Minato-ku, Tokyo 105-8634, Japan
Manufacturing Sites
- Saga — Imari City (Kyushu Factory: Nagahama and Kubara)
- Saga — Kohoku Town, Kishima District (Kyushu Factory)
- Nagasaki — Omura City (Kyushu Factory)
- Yamagata — Yonezawa City (Yonezawa Plant)
- Hokkaido — Chitose City (Chitose Plant)
- Akita — Akita City (JSQ Division)
Company Overview
SUMCO manufactures and sells silicon wafers for the semiconductor industry. Its products support advanced logic, memory, analog, power and other device categories across 300 mm and smaller wafer diameters.
SUMCO’s role begins before any circuit is formed. Crystal quality, flatness, cleanliness, defect control and consistency define the process window available to chipmakers, while qualification requirements make substrate changes operationally significant.
Technology & Products
300 mm wafers
Primary substrates for advanced logic and memory production.
200 mm and smaller wafers
Substrates supporting mature, analog, power and specialty devices.
Epitaxial wafers
Wafers with engineered layers for specific device requirements.
Annealed wafers
Thermally processed substrates for controlled characteristics.
Advanced substrates
Products tailored to demanding device and process specifications.
Quality and technical support
Qualification, analysis and customer process collaboration.
Position in the Supply Chain
SUMCO is an upstream supplier to foundries, integrated device manufacturers and other chip producers. Wafer manufacturing requires high-purity polysilicon, crystal growth, slicing, polishing, cleaning, inspection and tight statistical process control.
Strategic Position
Its focused business model creates deep silicon-process expertise and close customer qualification relationships. The same focus also leaves earnings sensitive to wafer pricing, capacity utilization and semiconductor inventory cycles.
Ecosystem Impact
SUMCO links polysilicon suppliers, crystal-growth equipment, slicing and polishing tools, clean manufacturing, inspection systems and global wafer logistics. Capacity decisions can influence the economics of the broader silicon-wafer market for years.
Outlook
Growth Drivers
- Long-term growth in semiconductor units and wafer area
- Advanced-node substrate specifications
- Automotive, industrial and power-device demand
- Customer diversification of wafer supply
Risks
- Capital-intensive capacity additions
- Wafer pricing and utilization volatility
- Electricity and raw-material costs
- Customer inventory corrections
Key Points to Watch
- 300 mm wafer pricing and contracts
- New capacity ramp and utilization
- Advanced wafer qualification
- Free cash flow through investment cycles
Official Sources
Editorial note: This independent profile is based primarily on company-published information. Business conditions, products and plans may change. SemiStructure is not affiliated with the company, and this page does not constitute investment advice.
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