Producer
Sumco Corporation
World's second-largest silicon wafer manufacturer (~25–30% global share). Pure-play wafer company (unlike Shin-Etsu which is diversified). Sumco + Shin-Etsu together supply 60–70% of global 300mm semiconductor wafers. Samsung is a major investor (via SK Siltron subsidiary).
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Inputs supplied
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Goods downstream
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Facilities
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Stories
What they make
1 input Sumco Corporation supplies
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What else they do
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Silicon Wafers 300mm (Advanced Logic + Memory)
65%Silicon Wafers 200mm (Mature + Specialty)
25%Silicon Wafers 150mm and Smaller
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Intelligence
What's known
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Did you know2023
Silicon wafer supply concentration is more severe than chip foundry concentration. TSMC has ~60% of advanced foundry market — but TSMC must buy wafers from SUMCO or Shin-Etsu, who together control ~60% of 300mm silicon wafer supply. A disruption at SUMCO cascades through TSMC, Samsung, and SK Hynix simultaneously. The five global 300mm wafer suppliers (Shin-Etsu, SUMCO, Siltronic, SK Siltron, GlobalWafers) are all geographically concentrated in Japan, Germany, and Korea — three countries within reach of the same East Asian geopolitical risk zone. SUMCO's Imari, Saga campus in Japan is both the companys largest production facility and located on Kyushu island — roughly 200km from the Korea Strait — making it among the semiconductor supply chain assets with the highest geopolitical exposure outside of Taiwan. The wafer layer of the semiconductor supply chain receives far less policy attention than chip fabs, but sits upstream of all of them.
SUMCO Corporation ↗Origin2023
SUMCO was created in 2005 by the merger of Sumitomo Sitix Silicon (a Sumitomo Electric spinout) and Mitsubishi Silicon Corporation (a Mitsubishi Materials division) under pressure from Shin-Etsu Chemical's dominant position and the capital-intensive nature of silicon wafer manufacturing. Making semiconductor-grade silicon wafers requires growing 300mm single-crystal silicon ingots with fewer than one part-per-billion impurities using the Czochralski process — a specialized furnace technique dating to 1918. Both Sumitomo and Mitsubishi separately could not achieve the scale to remain competitive against Shin-Etsu; the merged SUMCO gave Japan a strong number-two. SUMCO is a pure-play company: unlike Shin-Etsu (which also makes PVC, photoresist, and silicones), SUMCO makes only silicon wafers — making it the most exposed to any semiconductor market downturn. When memory chip demand collapsed in 2023, SUMCO paused its JPY 930 billion capacity expansion in Imari, Saga (announced 2022 with Japanese government METI subsidies) — demonstrating how geopolitical semiconductor policy and commercial demand cycles can conflict.
SUMCO Corporation ↗