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                                    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, 2007

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

                                 Dammstrasse 19
                                   CH-6301 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 19, 2007 - Converium rejects unsolicited proposal by
SCOR

The Board of Directors of  Converium,  who is being advised by Credit Suisse and
JPMorgan,  has carefully  considered an unsolicited  proposal by SCOR,  over the
weekend, to acquire Converium at CHF 21.- per share. The Directors are unanimous
in their rejection of this proposal,  which they believe  fundamentally fails to
recognise  the value of  Converium's  franchise  and growth  prospects,  and is,
therefore,  not  in  the  interest  of  Converium,  its  shareholders,  and  its
customers.

Converium is a profitable and strong  reinsurer with a well recognised  position
in the market place.  Converium's  Board of Directors  believes that the Company
has the  potential  to  achieve a  sustainable  return on equity of 14% by 2009.
Reinsurance clients value  diversification and multi-line  reinsurance solutions
as well as the services provided by Converium.

Converium has repeatedly emphasised and demonstrated its commitment to restoring
its market position to pre-downgrade  levels;  and many clients have shown their
support in  achieving  this goal.  The  renewals  of January 1 2007 are the most
recent proof of this:  Converium succeeded in growing its reinsurance book while
improving technical profitability.

Enquiries

Beat W. Werder                         Marco Circelli
Head of Public Relations               Head of Investor Relations
beat.werder@converium.com              marco.circelli@converium.com
Phone:     +41 (0) 44 639 90 22        Phone:      +41 (0) 44 639 91 31
Fax:       +41 (0) 44 639 70 22        Fax:        +41 (0) 44 639 71 31

Dr. Kai-Uwe Schanz                     Inken Ehrich
Chief Communication & Corporate
 Development Officer                   Investor Relations Specialist
kai-uwe.schanz@converium.com           inken.ehrich@converium.com
Phone:     +41 (0) 44 639 90 35        Phone:      +41 (0) 44 639 90 94
Fax:       +41 (0) 44 639 70 35        Fax:        +41 (0) 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 a "BBB+"  financial  strength rating (Credit
Watch  positive) 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',  `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,  certain
financial guidance, e.g. related to the tax rate of the Company, the acquisition
costs ratio and the costs of the Corporate  Center,  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;  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.

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: February 22, 2007