Dec. 16, 2005

Other

Dainippon Sumitomo Pharma and Sumitomo Chemical File Countersuit Against Pfizer

Nov. 10, 2005

IR

Sumitomo Chemical Reports Interim Consolidated Financial Results

Nov. 9, 2005

Business & Products

Sumika Electronic Materials (Wuxi) Co., Ltd. Expands Production

Nov. 9, 2005

Business & Products

Sumitomo Chemical Acquires Stake in Quantum Leap Packaging Inc.

Nov. 9, 2005

Business & Products

Sumitomo Chemical Strengthens Color Filter Operations

Nov. 1, 2005

Other

Dainippon Sumitomo Pharma and Sumitomo Chemical Company file lawsuit against Pfizer

Oct. 21, 2005

Other

A Petition for a Preliminary Injunction filed by Pfizer about Amlodin

Oct. 17, 2005

Other

A Petition for a Preliminary Injunction filed by Pfizer about Amlodin

Sep. 27, 2005

IR

Revised Non-Consolidated Financial Estimates for First Half of Fiscal Year ending March 31, 2006

Sep. 7, 2005

Business & Products

Sumitomo Chemical Expands Anti-Malaria Olyset^® Net production in Tanzania

Sep. 1, 2005

Business & Products

Sumitomo Chemical Substantially Expands Polarizing Film Production for Large LCD Televisions

Aug. 22, 2005

Business & Products

Sumitomo Chemical Expands MMA Monomer Production in Korea

Aug. 4, 2005

IR

Sumitomo Chemical Reports Consolidated Financial Results For the Three Months Ended June 30, 2005

Aug. 1, 2005

Business & Products

Saudi Aramco and Sumitomo Chemical sign joint venture agreement to Form the Rabigh Refining and Petrochemical Co. (Petro-Rabigh)

Jun. 2, 2005

R&D

Sumitomo Chemical and Bayer CropScience to jointly develop new rice fungicide

May. 26, 2005

Business & Products

Sumitomo Chemical Announces Major Expansion of MMA Business

May. 25, 2005

Business & Products

Joint venture announced in polymer OLED material supply

May. 16, 2005

Business & Products

Sumitomo Chemical to acquire LUMATION LEPs from Dow

May. 13, 2005

IR

Sumitomo Chemical Company, Limited Consolidated Financial Results

Apr. 15, 2005

Business & Products

Sumitomo Chemical increases its shareholding in Sumitomo Pharmaceuticals

Mar. 28, 2005

Business & Products

Sumitomo Chemical Establishes a New Company in China for Production of Polypropylene Compounds

Mar. 23, 2005

Sustainability

Sumitomo Chemical Participates in the World Bank "BioCarbon Fund"

Mar. 11, 2005

Business & Products

Sumitomo Chemical Quadruples Production of its Anti-Malaria Olyset^® Net

Mar. 8, 2005

R&D

Sumitomo and Kureha Develop A New Fungicide for North America

Feb. 9, 2005

IR

Sumitomo Chemical Reports Consolidated Financial Results For the Nine Months Ended December 31, 2004

Feb. 8, 2005

Business & Products

Sumitomo Chemical Enters Into a License Agreement With Syngenta on a New Herbicide

Feb. 7, 2005

Business & Products

Sumitomo Chemical Upgrades Polypropylene Capacity in Singapore

Jan. 28, 2005

Sustainability

Sumitomo Chemical Contributes to the Roll Back Malaria Campaign Program

Jan. 28, 2005

Sustainability

Sumitomo Chemical Announces its Participation in the United Nations Global Compact

Jan. 28, 2005

Sustainability

Sumitomo Chemical Contributes to the Asian Tsunami Relief Effort

Jan. 20, 2005

Business & Products

Sumitomo Chemical reinforces IT-related chemicals business