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 March, 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 - March 22, 2005 - Converium is pleased to announce the
nomination of Dr Markus Dennler and Rudolf Kellenberger to stand for election as
new members of its Board of Directors.

Dr Markus Dennler, former Chief Executive Officer of Credit Suisse Group's Life
& Pensions business, and Rudolf Kellenberger, former Deputy Chief Executive
Officer of Swiss Re, will run for election as members of Converium's Board of
Directors for a three-year term of office. Named elections will take place at
the Company's upcoming Annual General Meeting on April 12, 2005 in Zug,
Switzerland.

Markus Dennler provides many years of managerial experience in banking and
insurance as well as extensive expertise in risk management.

Rudolf Kellenberger brings with him an in-depth knowledge of the reinsurance
business combined with vast managerial experience at Swiss Re.

Converium believes that having Markus Dennler and Rudolf Kellenberger on the
Company's Board of Directors can not only significantly strengthen the Board but
also Converium's expertise in its core areas of business.

Converium is very pleased about the agreement of Messrs Dennler and Kellenberger
to stand for election.

CVs:

Markus Dennler served in a series of positions within the Credit Suisse Group,
most recently as a member of the Executive Board of Credit Suisse Financial
Services and as Chief Executive Officer responsible for the global operational
Life & Pensions business. Prior, he was a member of the Corporate Executive
Board of Winterthur Insurance (subsidiary of Credit Suisse Group). Markus
Dennler studied law at the University of Zurich and graduated in 1982. He
received his doctorate degree in 1984 and was admitted to the Bar of Zurich in
1986. Further he attended the International Bankers School in New York and the
Harvard Business School (AMP) in Boston. Currently he is a member of the Board
of Directors of Swissquote Group and a councillor of the British-Swiss Chamber
of Commerce.

Rudolf Kellenberger served as Deputy Chief Executive Officer of Swiss Re from
April 1, 2000 until the end of 2004. In this function he dedicated much of his
time to tasks within the Corporate Center, in particular in the field of
Management Development and E-Business Development. Previously, he served in a
series of positions within Swiss Re's Executive Board assuming responsibilities
for the Northern European reinsurance sector and Special Lines and, as of July
1998, taking on the leadership of Swiss Re's then newly founded Europe division.
Rudolf Kellenberger studied civil engineering at the Federal Institute of
Technology (ETH), Zurich, graduating in 1970. He is a member of the Board of
Directors of Swiss Life.



                                  * * * * * * *


Enquiries:

Esther Gerster                                Zuzana Drozd
Head of Public Relations                      Head of Investor Relations
esther.gerster@converium.com                  zuzana.drozd@converium.com

Phone:     +41 (0) 1 639 90 22                Phone:      +41 (0) 1 639 91 20
Fax:       +41 (0) 1 639 70 22                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 `seek to', `expects', `should continue', `believes',
`anticipates', `estimates' and `intends'. The specific forward-looking
statements cover, among other matters, the reinsurance market, the Company's
operating results, the rating environment and the prospect for improving
results. 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 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/ Terry Clarke
                                           ----------------
                                           Name:      Terry Clarke
                                           Title:     CEO




                                        By:/s/ Christian Felderer
                                           ----------------------
                                           Name:      Christian Felderer
                                           Title:     General Legal Counsel



Date: March 23, 2005