HSINCHU, Taiwan, September 26, 2006 - ChipMOS TECHNOLOGIES (Bermuda) LTD. ("ChipMOS" or the "Company") (Nasdaq: IMOS) today announced its intention to offer approximately US$85 million (or US$100 million including the initial purchaser's over-allotment option) of convertible senior notes due 2011, subject to entering into a purchase agreement with the initial purchaser and subject to market and other conditions. The notes will be convertible into common shares of the Company and are expected to mature in five years, subject to exercise of the Company's call option or holders' put option. The Company will have the right to call the notes after the second anniversary of the issue date (1) if the market price of the common shares of the Company exceeds 130% of the conversion price then in effect for a certain period or (2) if at least 90% of the initial aggregate principal amount of the notes have been converted, redeemed or repurchased. It is also contemplated that holders will have the right to put the notes at the principal amount plus any accrued and unpaid interest on the second anniversary of the issue date or upon the occurrence of certain fundamental changes. The conversion rate, interest rate and offering price are to be determined.

The notes and the common shares issuable upon conversion of the notes have not been and will not be registered under the United States Securities Act of 1933 and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall it constitute an offer, solicitation or sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful. This press release is being issued pursuant to and in accordance with Rule 135c under the United States Securities Act of 1933.

About ChipMOS TECHNOLOGIES (Bermuda) LTD.:

ChipMOS ( http://www.chipmos.com/ ) is a leading independent provider of semiconductor testing and assembly services to customers in Taiwan, Japan, and the U.S. With advanced facilities in Hsinchu and Southern Taiwan Science Parks in Taiwan and Shanghai, ChipMOS and its subsidiaries provide testing and assembly services to a broad range of customers, including leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries.

Forward-Looking Statements

Certain statements contained in this announcement may be viewed as "forward-looking statements" within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended. Such forward-looking statements involve known and unknown risks, uncertainties and other factors, which may cause the actual performance, financial condition or results of operations of the Company to be materially different from any future performance, financial condition or results of operations implied by such forward-looking statements. Further information regarding these risks, uncertainties and other factors is included in the Company's most recent Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the "SEC") and in the Company's other filings with the SEC.