OMB Number: 3235-0116
                                                         Expires: March 31, 2003
                                                        Estimated average burden
                                                           hours per response: 8

                                    Form 6-K

                             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, 2007

                              CONVERIUM HOLDING AG
                 (Translation of registrant's name into English)

                                 Dammstrasse 19
                                   CH-6301 Zug
                   (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

News release
Converium Holding Ltd, Zug

Zug, Switzerland - April 26, 2007 - Converium notes the result of SCOR's
Extraordinary General Meeting and reiterates its opposition to the hostile
takeover bid

The Board of Directors of Converium notes that SCOR shareholders today approved
a capital increase arranged to fund the French reinsurer's hostile bid for

Markus Dennler, Chairman of Converium's Board of Directors, comments: "Given the
strength of Converium's franchise, today's decision by SCOR's shareholders to
vote in favour of the fourth capital increase since 2004 is unsurprising. The
decision by SCOR shareholders, however, in no way alters our opposition to the
hostile bid, which fundamentally undervalues the Company. Converium, therefore,
urges its shareholders to reject the SCOR offer. The Board of Directors will
continue to explore all options in order to maximize value for its stakeholders,
while also protecting the interests of all our employees."

SCOR's hostile approach is unprecedented in the reinsurance industry and carries
significant integration risks: its hostility may trigger an exodus at every
level of senior management, underwriters and other valuable specialists.
Converium's Zurich-based Employee Commission states: "The vast majority of
Converium employees are concerned about the hostile takeover bid by SCOR. There
is considerable anxiety of widespread potential job losses."

Converium highlights the Swiss Takeover Board's decision of Friday, April 20,
2007, to postpone the commencement of the offer period for Converium. The Swiss
Takeover Board indicated that SCOR's unsolicited tender offer must apply to all
of Converium's listed stakeholdings and that none of Converium's shareholders
can be excluded from SCOR's unsolicited tender offer. Converium welcomes the
Swiss Takeover Board's statement embracing the principle of equal treatment for
all shareholders and that SCOR must accept all shares which are tendered in
connection with SCOR's unsolicited tender offer.

Converium's Board of Directors urges its shareholders to reject SCOR's offer and
support a team which has proven its ability to drive the business forward. It is
a choice which favours certainty over considerable business, execution and
integration risks and a choice that preserves value.


Beat W. Werder                           Marco Circelli

Head of Public Relations                 Head of Investor Relations      

Phone:     +41 44 639 90 22              Phone:      +41 44 639 91 31

Fax:       +41 44 639 70 22              Fax:        +41 44 639 71 31

Dr. Kai-Uwe Schanz                              Inken Ehrich

Chief Communication & Corporate
Development Officer                             Investor Relations Specialist          

Phone:     +41 44 639 90 35                     Phone:      +41 44 639 90 94

Fax:       +41 44 639 70 35                     Fax:        +41 44 639 70 94

About Converium

Converium is an independent international multi-line reinsurer known for its
innovation, professionalism and service. Today Converium employs about 500
people in 15 offices around the globe and is organized into three business
segments: Standard Property & Casualty Reinsurance, Specialty Lines and Life &
Health Reinsurance. Converium has an "A-" ("strong") financial strength rating
(outlook stable) from Standard & Poor's and a "B++" financial strength rating
(outlook positive) 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', `aims' `should continue',
`believes', `anticipates', `estimates' and `intends'. The specific
forward-looking statements cover, among other matters, the Company's strategy
and management objectives, the reinsurance market, the Company's operating
results and SCOR's hostile tender offer. 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 whether we are able to secure an upgrade of our
financial strength ratings; our ability to refinance our outstanding
indebtedness and increase our use of hybrid capital; uncertainties of
assumptions used in our reserving process; risk associated with implementing our
business strategies and our capital improvement measures; 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; our ability to expand into emerging
markets; our ability to enter into strategic investment partnerships; 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; our ability to
regain past customers following any rating upgrades and the resolution 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 (including,
but not limited to, our Annual Report on Form 20-F filed 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.


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 3, 2007