September 1, 2022

For Immediate Release
Company Name:
Representative:

Sumitomo Chemical Co., Ltd.
Keiichi Iwata
President and Representative Director
Securities Code:
4005
Stock Exchange Listings: Prime Section of the Tokyo Stock Exchange
Inquiries:
Shunji Kobayashi
General Manager
Corporate Communications Dept.
(Tel: +81-3-5201-0200)

Notice Regarding the Establishment of a Subsidiary (Sub-subsidiary)by a Consolidated Subsidiary
Sumitomo Chemical Co., Ltd. (“Sumitomo Chemical” or “the Company”) hereby announces that
the Company’s Board of Directors resolved at its meeting held today that Dongwoo Fine-ChemCo., Ltd., a wholly-owned subsidiary of the Company, will establish a subsidiary (a sub-subsidiaryof the Company) in the United States.
1. Purpose of Establishing the New Subsidiary
In its Corporate Business Plan for the period from fiscal 2022 to fiscal 2024, Sumitomo
Chemical has set out a policy of striving to effectively capture the growing demand forsemiconductor materials, and the Company is working to strengthen its global production
system for the semiconductor process chemicals business. As semiconductor-related
investment in the U.S. accelerates, the Company will construct a new high-puritysemiconductor process chemical plant and endeavor to achieve further growth in its silicon
semiconductor materials business.
2. Outline of the Consolidated Subsidiary
Company name
Dongwoo Fine-Chem Co., Ltd.
Location
Pyeongtaek-si, Gyeonggi-do, South Korea
Representative
Inho Rha, Representative Director & President
Development, manufacturing and sales of semiconductor
Scope of businessprocess chemicals, photoresists, optical functional films, color
filters, touchscreen panels, and other materials
Capital288,176 million Korean won
Date of establishment
December 1991
Shareholder andSumitomo Chemical Co., Ltd.: 100%
shareholding ratio3. Outline of the New Subsidiary (Sub-subsidiary)Company name
Sumika Semiconductor Materials Texas Inc.
Address
Texas in the U.S.
Akira Nakanishi, Representative Director & Chairman of the Board
Representative
Dongjoo Yun, Representative Director & President
Scope of business
Manufacturing and sales of semiconductor process chemicals, etc.
CapitalUSD 130 million
Date of establishment September 2022 (scheduled)
Dongwoo Fine-Chem Co., Ltd.: 70%
Shareholders andSumitomo Chemical Co., Ltd.: 20%
shareholding ratios
Sumitomo Chemical Advanced Technologies LLC: 10%
Sumitomo Chemical will own 100% of the sharesin the New Subsidiary through its direct
Capitalinvestment and indirect investment via Dongwoo
relationship
Fine-Chem Co., Ltd. and Sumitomo Chemical
Relationship between
Advanced Technologies LLC, both of which are
the New Subsidiary
wholly-owned subsidiaries of Sumitomo Chemical.
and Sumitomo
Officers and employees of the Sumitomo Chemical
Personnel
ChemicalGroup will be appointed as members of the New
relationship
Subsidiary’s Board of Directors.
BusinessN/A
relationship
4. Impact on Financial Results
The impact on Sumitomo Chemical’s consolidated financial results for the current fiscal year will
be immaterial. The Company will make another announcement if any matter that should be
publicly announced arises in the future.