# SUMCO Corp **Source:** https://geo.sig.ai/brands/sumco-corp **Vertical:** Semiconductor Equipment **Subcategory:** Silicon Wafers **Tier:** Leader **Website:** sumcosi.com **Last Updated:** 2026-04-14 ## Summary SUMCO Corp (SUMCO) reported ¥423B (~$2.8B) revenue in FY2024. World's #2 silicon wafer maker with ~25% global share. Critical for all semiconductor manufacturing. HQ: Tokyo, Japan. ## Company Overview SUMCO Corporation is the world's second-largest manufacturer of silicon wafers — the fundamental substrate on which all modern semiconductors are fabricated — headquartered in Tokyo, Japan. Formed through the 2002 merger of Sumitomo Metal Industries' silicon wafer division and Mitsubishi Materials' silicon wafer business, SUMCO reported revenues of approximately ¥423B (~$2.8B) in FY2024. Silicon wafers are the blank "canvases" on which chip fabs (TSMC, Samsung, Intel) create transistors using photolithography and other processes. SUMCO produces polished silicon wafers in diameters ranging from 150mm to 300mm, with 300mm wafers being the industry standard for advanced chips. The company holds approximately 25% of the global silicon wafer market, competing primarily with Shin-Etsu Chemical (Japan, ~30% share), Siltronic AG (Germany, ~15%), SK Siltron (Korea, ~15%), and GlobalWafers (Taiwan, ~12%). The top five suppliers control nearly 100% of the global silicon wafer market, making it an oligopoly with high barriers to entry due to the extreme precision and purity requirements of semiconductor-grade silicon. SUMCO's business is deeply cyclical, tied to semiconductor capital expenditure cycles. The 300mm wafer market contracted in 2023–2024 as the semiconductor industry worked through excess inventory, but a recovery is underway driven by AI chip demand requiring massive TSMC and Samsung fab capacity expansion. SUMCO trades on the Tokyo Stock Exchange (SUMCO: 3436) and as an ADR. The company has announced significant capacity investments to meet long-term demand growth from AI, automotive, and power semiconductors. ## Frequently Asked Questions ### What is SUMCO's annual revenue? SUMCO Corporation reported approximately ¥423B (~$2.8B) in revenue for FY2024, with results pressured by the semiconductor industry inventory correction that began in 2023. ### What does SUMCO make? SUMCO manufactures polished silicon wafers in various diameters (150mm, 200mm, 300mm). These wafers are the substrate on which all semiconductor chips — processors, memory, AI accelerators — are manufactured. ### What is SUMCO's stock ticker? SUMCO Corporation trades on the Tokyo Stock Exchange under ticker 3436. It is available as an ADR for US investors. ### Who are SUMCO's main competitors? SUMCO's primary competitors are Shin-Etsu Chemical (Japan, market leader), Siltronic AG (Germany), SK Siltron (Korea, Samsung affiliate), and GlobalWafers (Taiwan). ### Why are silicon wafers important for AI chips? Every semiconductor — including NVIDIA's H100 GPU, AMD's MI300X, and custom AI ASICs — is fabricated on silicon wafers. As AI drives TSMC and Samsung to expand capacity aggressively, demand for SUMCO's 300mm wafers grows in direct proportion. ### What is a silicon wafer and why is SUMCO's product fundamental to all semiconductor manufacturing? Silicon wafers are thin circular slices of highly purified single-crystal silicon that serve as the substrate on which all modern semiconductor chips are fabricated — transistors, capacitors, and interconnects are built on and into the wafer surface through hundreds of process steps using photolithography, deposition, and etch. Without high-quality silicon wafers, there is no chip manufacturing. SUMCO produces polished 300mm silicon wafers with defect densities and surface roughness measured at atomic-level precision, as any imperfection in the substrate propagates into chip defects. The 300mm wafer market is a duopoly between SUMCO and Shin-Etsu Chemical, which together control approximately 60%+ of global supply. ### How does SUMCO's business cycle track with the semiconductor industry and what drives demand? SUMCO's revenue closely tracks global semiconductor manufacturing activity — when fab utilization rates are high (boom periods), wafer demand is strong and prices firm; during inventory corrections when fabs run below capacity, wafer demand softens and SUMCO's revenue declines. The 2022-2023 semiconductor inventory correction significantly impacted SUMCO's financial performance as major customers like TSMC and Samsung reduced capital expenditure and wafer orders. SUMCO also has long-term supply agreements with major foundries (TSMC, Samsung) that provide multi-year volume visibility, though pricing resets periodically based on market conditions. ### What is SUMCO's capacity expansion plan in response to long-term semiconductor demand growth? SUMCO is investing in capacity expansion at its Japanese manufacturing facilities (Saga, Imari, Yonezawa) to meet long-term wafer demand from both advanced logic (AI chips, smartphones) and power semiconductors (EV power electronics, industrial). Japan's government has provided subsidies for SUMCO's domestic semiconductor materials expansion as part of Japan's broader effort to strengthen domestic semiconductor supply chain resilience. SUMCO's expansion strategy prioritizes 300mm polished wafers (for advanced nodes) and epitaxial wafers (for power devices), while the 150-200mm market faces different dynamics due to different customer bases (mature node, specialty chips). ## Tags hardware, manufacturing, public, b2b --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*