------------------------ OMB APPROVAL ------------------------ OMB Number: 3235-0116 ------------------------ Expires: March 31, 2003 ------------------------ Estimated average burden hours per response: 8 ------------------------ Form 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2005 CONVERIUM HOLDING AG ------------------------------------------------- (Translation of registrant's name into English) Baarerstrasse 8 CH-6300 Zug Switzerland ------------------------------------------ (Address of principal executive offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. Form 20-F __X__ Form 40-F____ Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. Yes____ No__X__ If "Yes" is marked, indicate the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- Not Applicable Converium Holding Ltd, Zug Zug, Switzerland - February 4, 2005 - Converium announces estimates of losses from the South Asia tsunami and European winter storm Erwin as well as revised estimates of losses from 2004 hurricanes and typhoons. Following a diligent review of loss reports so far, Converium expects pre-tax net losses from the devastating tsunami that hit South and South East Asia on December 26, 2004 of approximately US$ 15 million. Expected losses are concentrated in property and non-life personal accident lines of business. Severe winter storm Erwin that swept across Northern Europe from January 7 to January 9, 2005 is expected to result in pre-tax net losses for Converium of between US$ 25 and 40 million which is reflective of the Company's market position in the region. Total estimated industry losses from Erwin range from US$ 1.3 to 1.8 billion. In addition, Converium has increased its estimate of expected net losses arising from third quarter Atlantic hurricane activity and Japan typhoons by US$ 23 million and US$ 13 million, respectively. Converium therefore expects total pre-tax net losses of US$ 132 million related to these hurricanes and typhoons. The majority of the development for the hurricanes stems from Ivan, where total industry claims (including Caribbean losses) are now believed to reach US$ 9 billion, up from earlier estimates of between US$ 4 and 6 billion. This unusual string of natural catastrophes is, however, not expected to materially weaken Converium's strong capitalization. * * * * * * * Enquiries: Michael Schiendorfer Zuzana Drozd Media Relations Manager Head of Investor Relations michael.schiendorfer@converium.com zuzana.drozd@converium.com Phone: +41 (0) 1 639 96 57 Phone: +41 (0) 1 639 91 20 Fax: +41 (0) 1 639 76 57 Fax: +41 (0) 1 639 71 20 About Converium Converium is an independent international multi-line reinsurer known for its innovation, professionalism and service. Today Converium employs more than 700 people in 20 offices around the globe and is organized into three business segments: Standard Property & Casualty Reinsurance, Specialty Lines and Life & Health Reinsurance. Converium has a "BBB+" rating (outlook stable) from Standard & Poor's and a "B++" rating (outlook stable) from A.M. Best Company. Important Disclaimer This document contains forward-looking statements as defined in the U.S. Private Securities Litigation Reform Act of 1995. It contains forward-looking statements and information relating to the Company's financial condition, results of operations, business, strategy and plans, based on currently available information. These statements are often, but not always, made through the use of words or phrases such as `expects', `should continue', `believes', `anticipates', `estimates' and `intends'. The specific forward-looking statements cover, among other matters, the reinsurance market, the outcome of insurance regulatory reviews, the Company's operating results, the rating environment and the prospect for improving results, the amount of capital required and impact of its capital improvement measures, including the restructuring of our U.S. business and its reserve position. Such statements are inherently subject to certain risks and uncertainties. Actual future results and trends could differ materially from those set forth in such statements due to various factors. Such factors include general economic conditions, including in particular economic conditions; the frequency, severity and development of insured loss events arising out of catastrophes, as well as man-made disasters; the outcome of our regular quarterly reserve review, the ability to exclude and to reinsure the risk of loss from terrorism; fluctuations in interest rates; returns on and fluctuations in the value of fixed-income investments, equity investments and properties; fluctuations in foreign currency exchange rates; rating agency actions; changes in laws and regulations and general competitive factors, and other risks and uncertainties, including those detailed in the Company's filings with the U.S. Securities and Exchange Commission and the SWX Swiss Exchange. The Company does not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. www.converium.com SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. CONVERIUM HOLDING AG By: /s/ Dirk Lohmann Name: Dirk Lohmann Title: CEO By: /s/ Christian Felderer Name: Christian Felderer Title: General Legal Counsel Date: February 8, 2005