Tokyo, Japan, April 17, 2009—Tosoh Corporation today announced changes in its top

management. Madoka Tashiro will step down as the Company’s chairman and CEO to become an

executive adviser to the Company while remaining a member of the Tosoh Board of Directors.

Takashi Tsuchiya will vacate the presidency of the Company to become Tosoh’s chairman and

CEO. And Kenichi Udagawa will move up from his position as managing director to assume his new

role as the president of the Company. These changes will take effect on June 26, 2009, when

nominations are made official during the Board of Directors’ Meeting scheduled to follow the 2009

Annual Shareholders’ Meeting. The decision to rejuvenate the Board was undertaken to strengthen

core operations and promote overall growth and higher profitability.

Madoka Tashiro’s long and distinguished career at Tosoh Corporation began in 1956. In 1964, he

established Tosoh’s first overseas office, in New York, and has since led the Company’s global

expansion. He was particularly active in building out the Tosoh Group worldwide during his tenure

as Tosoh’s chairman of the Board, which began in 2001. Mr. Tashiro’s achievements as chairman

are numerous, and he will continue to play a vital role in guiding the Tosoh Group as an executive

adviser.

Takashi Tsuchiya, meanwhile, has served as president of Tosoh since 2001. In addition to his

background in chemical engineering, he brings to the table exceptional business judgment and

expertise in adapting quickly to changing operating environments. Mr. Tsuchiya thus is the ideal

man to lead the Company going forward. When he headed Corporate Strategy and Planning at

Tosoh he demonstrated sound capabilities in restructuring. His efforts strengthened the Company’s

vinyl chain and Specialty Group and significantly improved the Company’s profitability.

Kenichi Udagawa began his career with Tosoh Corporation in 1972 after graduating from the

prestigious Tokyo Institute of Technology, where he studied polymer science in the Department of

Engineering. Mr. Udagawa has served in various capacities as a member of the Tosoh Board of

Directors and headed diverse strategic and planning groups at Tosoh headquarters. In 2008, he

was made a managing director of Tosoh Corporation with responsibility for the Nanyo Complex.