What does SUMCO make?

SUMCO makes 300mm wafers, epitaxial wafers.

Who are SUMCO's key suppliers?

SUMCO's tracked suppliers include Wacker Chemie, Tokuyama.

Who are SUMCO's customers?

SUMCO's tracked customers include TSMC, Samsung Electronics, Intel, SK hynix, Micron Technology, United Microelectronics (UMC), GlobalFoundries, SMIC.

Where is SUMCO headquartered?

SUMCO is based in 東京都港区, JP.

What part of the semiconductor supply chain is SUMCO in?

SUMCO operates in the Silicon Wafers segment, where it is a market major.

SUMCO

Q: Where is SUMCO headquartered?

SUMCO is based in 東京都 港区, JP.

SUMCO is a major in the Materials segment of the semiconductor & AI supply chain, headquartered in 東京都港区, JP. Its key suppliers include Wacker Chemie, Tokuyama. Its key customers include TSMC, Samsung Electronics, Intel.

Second-largest silicon wafer producer, supplying all leading fabs.

Ticker: TSE: 3436
Headquarters: 東京都港区, JP
Founded: 1999
Revenue: $2.1B (FY2025) · -15.7% YoY
Net income: $-74M
Operating margin: -2.7%
Market position: major
Value-chain segment: Silicon Wafers
Key products: 300mm wafers, epitaxial wafers

About SUMCO

SUMCO, headquartered in Japan, operates in the Silicon Wafers segment of the semiconductor & AI supply chain and is positioned as a market major there. Its key products include 300mm wafers, epitaxial wafers. wafergraph maps 2 tracked suppliers and 8 tracked customers for SUMCO across the value chain. It has a supply-chain criticality score of 69/100, with 242 companies downstream of it.

SUMCO Corporation is a Japanese semiconductor company, manufacturing silicon wafers for semiconductor manufacturers worldwide.

Role in the chain

SUMCO is a market major in Materials (Silicon Wafers), headquartered in Japan. Second-largest silicon wafer producer, supplying all leading fabs.

Diligence questions

The dataset records 2 tracked suppliers for SUMCO. Which of those edges are researched (named in a filing or primary source) versus segment-inferred, and what happens if one of them stops shipping?
The dataset names 8 tracked customers for SUMCO. How concentrated is demand among those names, and which of them have a documented second source in this graph?
SUMCO is headquartered in Japan. What jurisdiction, export-control or logistics risk sits at that HQ, versus at the fabs or plants the filings actually name?
SUMCO trades as TSE:3436. What does the latest reported period say about capacity and backlog versus the graph position above?
Before treating any edge as a verified relationship, check the provenance labels on the company page and the method note at /methodology.

Full diligence pack for SUMCO