Micronas - Over-Allotment Option exercised in full (031215)

Embargoed / not for release in the United States, Canada, Japan or Australia

Micronas reports that Credit Suisse First Boston has exercised the over-allotment option consisting of 455,000 additional registered shares in full. As a consequence, the total offering size amounts to 4,605,000 registered shares with a nominal value of CHF 1 each.

Micronas will receive total net proceeds of approximately CHF 230 million (including the over-allotment option) from the rights and global offerings. After completion of the offering (including the over-allotment option) the share capital of Micronas Semiconductor Holding AG registered with the Commercial Register of the Canton of Zurich amounts to CHF 31,527,480 divided into 31,527,480 registered shares with a nominal value of CHF 1 each.

The Micronas Group is a leading independent supplier of innovative application-specific semiconductor solutions for consumer and automotive electronics. Its shares are listed on the SWX Swiss Exchange and on the Prime Standard segment (TecDAX) in Frankfurt.

Zurich, December 15, 2003 Micronas Semiconductor Holding AG