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Overview

Metal Products

SUMCO CORPORATION

SUMCO Corporation is a leading manufacturer and seller of silicon wafers for semiconductor manufacturers, producing polished wafers and epitaxial wafers in diameters ranging from 100mm to 300mm. The company operates manufacturing facilities across Japan (Saga, Yamagata, Nagasaki, Hokkaido, Miyazaki, Mie), the United States, Indonesia, and Taiwan, serving global semiconductor makers producing memory, logic, and other devices. SUMCO also produces high-purity polycrystalline silicon and high-purity quartz crucibles used in the silicon crystal growing process.

Market Cap

¥821B

US$5.24B

¥1,147B

US$7.31B

Stock¥2,347.5▼-1.63%

US$1 = ¥156.80 (2026-10-23)

LTM EV/EBITDA

9.7

LTM EV/EBIT

LTM PER

LTM PBR

1.4

Stock vs TOPIX (1Y, base=100)vs TOPIX ▲+16.5%pt

Oct 24, 25 – Oct 23, 26StockTOPIX

1Nov 12, 25Semiconductor demand concerns

2Mar 18, 26Semiconductor industry recovery expectations

3Aug 7, 26Q2 FY2026/12 earnings announced

4Oct 15, 26CoreWeave bond-price shock triggers semiconductor sell-off, Nikkei -3,318 yen

MC → EV Bridge

AI Briefing

Generating insights…

Performance & Balance

Revenue 5Y (¥B)

EBITDA 5Y (¥B)

Net Income 5Y (¥B)

Capital Structure

61%

39%

EquityD/E 0.65xDebt

Liquidity vs Debt 5Y (¥B)▼ Net Debt

CashInv. Sec.Debt

Shareholders

Top 10 hold 45.7%

as of 2026-06-30 · Source: Annual Securities Report

The Master Trust Bank of Japan, Ltd. (Trust Account)

15.53%

Custody Bank of Japan, Ltd. (Trust Account)

7.80%

MSCO CUSTOMER SECURITIES (Standing Proxy: Morgan Stanley MUFG Securities Co., Ltd.)

5.50%

JPMSLLC CLIENT ASSETS SK JPY (Standing Proxy: Citibank, N.A., Tokyo Branch)

3.34%

STATE STREET BANK AND TRUST COMPANY 505001 (Standing Proxy: Mizuho Bank, Ltd.)

3.22%

STATE STREET BANK AND TRUST COMPANY 505223 (Standing Proxy: Mizuho Bank, Ltd.)

2.76%

BBH (LUX) FOR FIDELITY FUNDS-GLOBAL TECHNOLOGY POOL (Standing Proxy: MUFG Bank, Ltd.)

2.14%

STATE STREET BANK AND TRUST COMPANY 505103 (Standing Proxy: Mizuho Bank, Ltd.)

2.03%

JP MORGAN CHASE BANK 385781 (Standing Proxy: Mizuho Bank, Ltd.)

1.93%

CACEIS BK ES IICS CLIENTS (Standing Proxy: The Hongkong and Shanghai Banking Corporation Limited, Tokyo Branch)

1.49%

Management

13 officers

Jiro TATSUTA

Representative Director, President, Chairman of the Board of Directors

Apr 1985 Joined Mitsubishi Metal Corporation (now Mitsubishi Materials Corporation) Apr 2008 General Manager, Overseas Sales Division, the Company Jan 2012 President, SUMCO Singapore Pte. Ltd.; President, SUMCO Taiwan Technology Corporation Mar 2013 President, SUMCO Phoenix Corporation Mar 2014 Executive Officer, the Company; President, SUMCO Phoenix Corporation Mar 2017 Managing Executive Officer, the Company; President, SUMCO Phoenix Corporation Mar 2021 Senior Managing Executive Officer, the Company; President, SUMCO Phoenix Corporation Mar 2022 Representative Director, Vice President, General Manager, Technology Division, the Company Mar 2023 Representative Director, Vice President, General Manager, Production Technology Division, Head of Kyushu Plant, the Company Mar 2026 Representative Director, President, the Company (current)

1960-02-16

Shinichi KUBOZOE

Representative Director, Vice President, Head of President's Office

Apr 1985 Joined Sumitomo Metal Industries, Ltd. (now Nippon Steel Corporation) Apr 2012 General Manager, Management Planning Department, the Company Oct 2012 General Manager, Accounting Department, the Company Mar 2018 Executive Officer, the Company Jul 2018 Executive Officer, General Manager, Finance Department, the Company Mar 2020 Managing Executive Officer, Assistant Head of President's Office, the Company Mar 2021 Managing Executive Officer, Head of President's Office, the Company Mar 2023 Senior Managing Executive Officer, Head of President's Office, the Company Mar 2024 Representative Director, Vice President, Head of President's Office, the Company (current)

1962-08-12

Naruya HIROTA

Representative Director, Vice President, General Manager, Production Technology Division

Apr 1985 Joined Mitsubishi Metal Corporation (now Mitsubishi Materials Corporation) Feb 2011 General Manager, Epitaxial Technology Department, the Company Mar 2017 Executive Officer, General Manager, Epitaxial Technology Department, the Company May 2018 Executive Officer, Deputy General Manager, Technology Division, the Company Jan 2020 Executive Officer, General Manager, AI Promotion Division; Deputy General Manager, Technology Division, the Company Mar 2021 Managing Executive Officer, Deputy General Manager, Technology Division, the Company Jan 2022 Managing Executive Officer, General Manager, Construction Division, the Company Mar 2022 Senior Managing Executive Officer, General Manager, Construction Division, the Company Mar 2023 Vice President, General Manager, Construction Division, the Company Mar 2026 Representative Director, Vice President, General Manager, Production Technology Division, Head of Kyushu Plant, the Company (current)

1961-02-06

Takeo KATO

Director, Senior Managing Executive Officer, General Manager, AI Promotion Division

Apr 1997 Joined Mitsubishi Materials Corporation Jun 2016 President, SUMCO Taiwan Technology Corporation Dec 2018 General Manager, Customer Technology Department, the Company Sep 2019 General Manager, Productivity Promotion Department, the Company Jan 2020 Deputy General Manager, AI Promotion Division; General Manager, Productivity Promotion Department, the Company Mar 2021 Executive Officer, General Manager, AI Promotion Division; General Manager, Productivity Promotion Department, the Company Mar 2022 Managing Executive Officer, General Manager, AI Promotion Division, the Company Mar 2023 Senior Managing Executive Officer, General Manager, AI Promotion Division, the Company Mar 2024 Director, Senior Managing Executive Officer, General Manager, AI Promotion Division, the Company (current)

1970-03-04

Ginji YATA

Director, Managing Executive Officer, General Manager, Sales Division

Apr 1993 Joined Sumitomo Metal Industries, Ltd. (now Nippon Steel Corporation) Mar 2022 General Manager, Overseas Sales Department, the Company Mar 2025 Executive Officer, Deputy General Manager, Sales Division, the Company Mar 2026 Director, Managing Executive Officer, General Manager, Sales Division, the Company (current)

1968-05-30

Masayuki HASHIMOTO

Director, Advisor

Apr 1976 Joined Mitsubishi Metal Corporation (now Mitsubishi Materials Corporation) Mar 1997 President, Mitsubishi Polycrystalline Silicon America Corporation Jun 2003 General Manager, Silicon Business Division, Mitsubishi Materials Corporation Apr 2005 General Manager, Silicon Business Division, Electronic Materials Business Company, Mitsubishi Materials Corporation; Outside Audit & Supervisory Board Member, the Company Jun 2005 Executive Officer, General Manager, Corporate Planning Office, Mitsubishi Materials Corporation Jun 2006 Managing Executive Officer, President, Electronic Materials Business Company, Mitsubishi Materials Corporation Jun 2007 Representative Director, Managing Director, President, Electronic Materials Business Company, Mitsubishi Materials Corporation Apr 2010 Outside Director, the Company Jun 2011 Representative Director, Executive Vice President, Mitsubishi Materials Corporation Apr 2012 Representative Director, President, the Company Mar 2016 Representative Director, Chairman and CEO, the Company Mar 2026 Director, Advisor, the Company (current)

1951-01-10

Hiroshi ITO

Director, Audit and Supervisory Committee Member

Apr 1987 Joined Sumitomo Metal Industries, Ltd. (now Nippon Steel Corporation) Apr 2014 General Manager, General Affairs Department, Wakayama Works, Nippon Steel Corporation Apr 2016 General Manager, Affiliated Companies Department, Nippon Steel Corporation Apr 2019 Advisor, General Manager, Finance Department, Kurosaki Harima Corporation Mar 2020 General Manager, Accounting Department, the Company Mar 2023 Executive Officer, General Manager, Accounting Department, the Company Mar 2026 Director, Full-time Audit and Supervisory Committee Member, the Company (current)

1964-08-16

Shinichiro OTA

Director, Audit and Supervisory Committee Member

Jul 1969 Joined Ministry of International Trade and Industry (now Ministry of Economy, Trade and Industry) Jun 1998 Director-General, Environment and Industrial Siting Bureau, METI Sep 1999 Director-General, Machinery and Information Industries Bureau, METI Jan 2001 Director-General, Commerce and Information Policy Bureau, METI Jul 2002 Commissioner, Japan Patent Office Jun 2005 Representative Director, Executive Vice President, Electric Power Development Co., Ltd. Jun 2013 Advisor, Electric Power Development Co., Ltd. Mar 2016 Outside Director, Audit and Supervisory Committee Member, the Company (current) Aug 2017 Representative Director, President, SPACE ONE Co., Ltd. (formerly New Generation Small Rocket Development Planning Co., Ltd.) Jun 2018 Special Advisor, Electric Power Development Co., Ltd. (current) Mar 2022 Special Advisor, SPACE ONE Co., Ltd. (current)

1946-05-13

Masahiko SUE

Director, Audit and Supervisory Committee Member

Apr 1979 Joined Prime Minister's Office (now Cabinet Office) Sep 2012 Director-General, Statistics Bureau, Ministry of Internal Affairs and Communications Jul 2014 Director for Statistical Information Strategy Promotion, Ministry of Internal Affairs and Communications; Director, Statistics Training Institute Apr 2016 Executive Director and Vice President, Shiga University (current) Mar 2022 Outside Director, Audit and Supervisory Committee Member, the Company (current)

1955-12-18

Amy Shigemi HATTA

Director, Audit and Supervisory Committee Member

Apr 1996 Joined ASTRA AB (now AstraZeneca PLC) Aug 2000 Joined Merrill Lynch & Co. (now BofA Securities) Apr 2002 Joined TIAA-CREF (now Nuveen, a TIAA Company) Mar 2023 CEO and Chief Advisor, Aglow Management Inc. (current) Aug 2023 Outside Director, Nomura Holding America Inc. (current) Nov 2023 Outside Director, SHIFT Inc. (current) Mar 2024 Outside Director, Audit and Supervisory Committee Member, the Company (current) Jun 2025 Outside Director, Audit and Supervisory Committee Member, Nomura Asset Management Co., Ltd. (current)

1968-03-07

Anita KILLIAN

Director, Audit and Supervisory Committee Member

Jun 1987 Administrator and Lecturer, Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology Jun 1994 Resource Development Officer, Alumni Association, Massachusetts Institute of Technology Aug 1995 Resource Development Officer, Lecturer, Sloan School of Management, Massachusetts Institute of Technology Jul 1997 Joined Value Quest TA Apr 2000 Joined Wellington Management Dec 2003 Managing Director, Associate Partner, Wellington Management Dec 2007 Senior Managing Director, Partner, Wellington Management Dec 2022 Left Wellington Management Mar 2025 Outside Director, Audit and Supervisory Committee Member, the Company (current)

1963-11-17

Hiyoo KANBAYASHI

Director, Audit and Supervisory Committee Member

Nov 1976 Joined Arthur Andersen & Co. Aug 1981 Registered as Certified Public Accountant Jul 1991 Partner, Andersen Worldwide Jul 1993 Representative Partner, Asahi & Co. Sep 2001 Director, Andersen Worldwide Organization Jan 2003 Representative Director, President, Protiviti Japan Co., Ltd. Jan 2011 CEO and President, Protiviti LLC Jan 2016 Chairman and Senior Managing Director, Protiviti LLC Oct 2016 President, Japan Association for Internal Control Research (now Japan Governance Research Association) Apr 2017 Representative Member, ERM Management Research LLC (current) Jun 2017 Outside Audit & Supervisory Board Member, Sojitz Corporation Jun 2018 Outside Director, Audit and Supervisory Committee Member, Murata Manufacturing Co., Ltd. Apr 2021 Senior Managing Director, Protiviti LLC Jan 2026 Senior Advisor, Protiviti LLC (current) Mar 2026 Outside Director, Audit and Supervisory Committee Member, the Company (current)

1951-10-15

Kishiko WADA

Director, Audit and Supervisory Committee Member

Apr 1996 Registered as Attorney; joined Fuji Partners Law Office (current) Jul 2015 Outside Director, Toshiba Plant Systems & Services Corporation Mar 2021 Outside Audit & Supervisory Board Member, L is B Co., Ltd. (current) Jun 2022 Outside Director, Audit and Supervisory Committee Member, Toko, Inc. (current) Jun 2022 Outside Audit & Supervisory Board Member, Sundrug Co., Ltd. (current) Mar 2026 Outside Director, Audit and Supervisory Committee Member, the Company (current)

1971-06-20

Large Shareholding Reports

Amova Asset Management Co., Ltd.

2026-09-24

3.31%→3.16%

Nomura Asset Management Co., Ltd.

2026-09-04

5.89%→4.37%

Fidelity Management & Research Company LLC

2026-07-23

2.87%→2.32%

Fidelity Management & Research Company LLC

2026-06-19

2.82%→2.87%

FMR LLC

2026-06-19

—

FMR LLC

2026-06-19

—

Fidelity Management & Research Company LLC

2026-06-19

2.82%→2.82%

Fidelity Management & Research Company LLC

2026-06-09

2.82%

FMR LLC

2026-06-09

—

Nomura Asset Management Co., Ltd.

2026-06-04

6.65%→5.89%

Eastspring Investments (Singapore) Limited

2026-05-08

6.38%→4.49%

Amova Asset Management Co., Ltd.

2026-04-21

3.43%→3.31%

Nomura Asset Management Co., Ltd.

2026-04-21

7.06%→6.65%

Nomura Asset Management Co., Ltd.

2026-04-06

7.12%→7.06%

Nomura Asset Management Co., Ltd.

2026-03-19

7.08%→7.12%

Amova Asset Management Co., Ltd.

2026-02-19

3.41%→3.43%

Nomura Asset Management Co., Ltd.

2026-02-06

5.78%→7.08%

Goldman Sachs & Co. LLC

2026-02-06

2.15%→2.19%

FMR LLC

2026-01-22

5.19%→5.75%

Nomura Asset Management Co., Ltd.

2026-01-21

5.60%→5.78%

Amova Asset Management Co., Ltd.

2026-01-21

3.41%→3.41%

Goldman Sachs & Co. LLC

2026-01-09

2.15%

FMR LLC

2026-01-09

5.19%→5.19%

Nomura Asset Management Co., Ltd.

2026-01-08

5.22%→5.60%

Amova Asset Management Co., Ltd.

2026-01-08

3.41%→3.41%

Goldman Sachs & Co. LLC

2025-12-22

2.78%→2.16%

FMR LLC

2025-12-05

5.19%

Nomura Asset Management Co., Ltd.

2025-12-05

6.32%→5.22%

Eastspring Investments (Singapore) Limited

2025-12-03

5.22%→6.38%

Goldman Sachs & Co. LLC

2025-11-21

2.78%

Nomura Asset Management Co., Ltd.

2025-11-20

7.06%→6.32%

Amova Asset Management Co., Ltd.

2025-11-20

3.37%→3.41%

Amova Asset Management Co., Ltd.

2025-10-21

3.37%→3.37%

Nomura Asset Management Co., Ltd.

2025-10-21

6.47%→7.06%

Amova Asset Management Co., Ltd.

2025-10-06

3.36%→3.37%

Amova Asset Management Co., Ltd.

2025-09-19

3.36%→3.36%

Sumitomo Mitsui Trust Asset Management Co., Ltd.

2025-08-06

3.37%→3.37%

Disclosures

No disclosures

Primary Source Filings

EDINET

2026-09-24

Large Shareholding Report

SUMCO CORPORATION

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SUMCO CORPORATION

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