May 22, 2006

ChipMOS ANNOUNCES FILING OF PRELIMINARY PROSPECTUS SUPPLEMENT

HSINCHU, Taiwan, May 22, 2006 -- ChipMOS TECHNOLOGIES (Bermuda) LTD. ("ChipMOS" or the "Company") (Nasdaq: IMOS) announced today that it has filed with the U.S. Securities and Exchange Commission (the "SEC") a preliminary prospectus supplement relating to the proposed sale of 6,956,522 of its common shares by its majority shareholder, Mosel Vitelic Inc. ("Mosel"), through Mosel's wholly-owned subsidiary, Giant Haven Investments Limited, pursuant to an effective shelf registration statement filed with the SEC. An additional 1,043,478 common shares may be sold in the offering by the selling shareholder pursuant to an option granted to the underwriter to cover over-allotments. ChipMOS will neither sell any securities nor receive any proceeds in the proposed offering.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy any securities of the Company.

Deutsche Bank Securities Inc. is acting as sole manager of the proposed offering. When available, copies of the preliminary prospectus supplement relating to the proposed offering may be obtained from Deutsche Bank Securities Inc., 60 Wall Street, 4th Floor, New York, NY 10005, Attention: Syndicate Department.

About ChipMOS TECHNOLOGIES (Bermuda) LTD.:

ChipMOS (http://www.chipmos.com.tw/) 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.

Contacts: In Taiwan R.O.C. Dr. S.K. Chen ChipMOS TECHNOLOGIES (Bermuda) LTD. +886-6-507-7712 s.k._chen@chipmos.com.tw

In the U.S. David Pasquale The Ruth Group 646-536-7006 dpasquale@theruthgroup.com