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 May, 2006 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 - May 9, 2006 - Converium reports successful April 1 treaty renewals with stable premium volume. Converium recorded a successful April 1 renewal of non-life treaties. The Company bound non-life contracts of US$ 272.2 million or 99.5% of the business that was up for renewal. This result is fully in line with previously stated expectations. It again testifies to the resilience of Converium's franchise, following the gratifying results of the January 1 renewals. The April 1 renewals primarily included business written in Asia Pacific, as well as from the Medical Defence Union (MDU) in the United Kingdom, a provider of medical malpractice insurance coverage with whom Converium entertains a long-standing strategic alliance. In addition, some smaller Latin American and US casualty portfolios were up for renewal. Consistent with its underwriting strategy Converium chose not to renew US casualty business. Not taking into account this US book of business, overall premium volume from the April 1 renewal has increased by 3.7%. Asia Pacific In Asia Pacific, Converium bound non-life business of US$ 62.4 million, a minor decrease of 1.6%. In the Japanese market, which accounts for two thirds of the renewed Asia Pacific book of business, premium volume was reduced by 2.9%. Converium, however, successfully maintained its strong position with the largest Japanese clients. In South Korea and India, the Company's book of business grew by 2.4% and 16.2%, respectively. Given the trend of clients retaining more risk and the resulting lower overall reinsurance market volume, particularly in Japan, the renewal results are very satisfactory. They demonstrate the robust quality of Converium's long-term client relationships and are clear evidence of the Company's strong position in the Asian markets. Medical Defence Union Converium is also very satisfied with the renewal of its Medical Defence Union (MDU) book of business, which grew by 3.0% to US$ 168.1 million. Reiteration of overall premium target for 2006 Following the results of the April renewals, Converium reiterates its expectation of writing gross premiums for the 2006 calendar year of US$ 1.8 - 1.9 billion, including Life & Health business. The Company also re-affirms its commitment to adhere to strict profitability standards. Inga Beale, Chief Executive Officer, said: "I am very pleased with the April 1 renewals. The strong results reflect the loyalty of many of our Asian clients, based on Converium's long-standing relationships and highly regarded technical expertise. We will continue to develop our presence in Asia, which is one of our key markets for future growth." Inga Beale continued: "The long-term business of MDU remains an important part of our book of business. We are proud of our fruitful relationship with the MDU and look forward to continue providing high-quality services to our strategic alliance partner." * * * * * * * Enquiries: Esther Gerster Zuzana Drozd Head of Public Relations Head of Investor Relations esther.gerster@converium.com zuzana.drozd@converium.com Phone: +41 (0) 44 639 90 22 Phone: +41 (0) 44 639 91 20 Fax: +41 (0) 44 639 70 22 Fax: +41 (0) 44 639 71 20 About Converium Converium is an independent international multi-line reinsurer known for its innovation, professionalism and service. Today Converium employs about 600 people in 18 offices around the globe and is organized into four business segments: Standard Property & Casualty Reinsurance, Specialty Lines and Life & Health Reinsurance, which are based principally on ongoing global lines of business, as well as the Run-Off segment, which primarily comprises the business from Converium Reinsurance (North America) Inc., excluding the US originated aviation business portfolio. 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 ` seek to', `expects', `should continue', `believes', `anticipates', `estimates' and `intends'. The specific forward-looking statements cover, among other matters, the Company's internal review and related restatement, the reinsurance market, the Company's operating results, the rating environment and the prospect for improving results and expense reductions. 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 the impact of our ratings downgrade or a further lowering or loss of one of our financial strength ratings; the impact of the restatement on our ratings and client relationships; uncertainties of assumptions used in our reserving process; risk associated with implementing our business strategies and our capital improvement measures and the run-off of our North American business; cyclicality of the reinsurance industry; the occurrence of natural and man-made catastrophic events with a frequency or severity exceeding our estimates; acts of terrorism and acts of war; changes in economic conditions, including interest and currency rate conditions that could affect our investment portfolio; actions of competitors, including industry consolidation and development of competing financial products; a decrease in the level of demand for our reinsurance or increased competition in our industries or markets; a loss of our key employees or executive officers without suitable replacements being recruited within a suitable period of time; our ability to address material weaknesses we have identified in our internal control environment; political risks in the countries in which we operate or in which we reinsure risks; the passage of additional legislation or the promulgation of new regulation in a jurisdiction in which we or our clients operate or where our subsidiaries are organized; the effect on us and the insurance industry as a result of the investigations being carried out by the US Securities and Exchange Commission, New York's Attorney General and other governmental authorities; changes in our investment results due to the changed composition of our invested assets or changes in our investment policy; failure of our retrocessional reinsurers to honor their obligations or changes in the credit worthiness of our reinsurers; our failure to prevail in any current or future arbitration or litigation; and extraordinary events affecting our clients, such as bankruptcies and liquidations , 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/ Inga Beale Name: Inga Beale Title: CEO By: /s/ Christian Felderer Name: Christian Felderer Title: General Legal Counsel Date: May 10, 2006