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 July 2003 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 Deutsche Bank Adjusts its Holding in Converium Shares From 7.96% to 1.02%, Held and Managed in Various Funds ZUG, Switzerland--(BUSINESS WIRE)--July 17, 2003--Disclosure of Shareholdings Pursuant to Art. 20 SESTA: Converium Holding Ltd (NYSE:CHR, SWX:CHR) has been notified Deutsche Bank AG, Taunusanlage 12, D-60325 Frankfurt am Main, Germany, has decreased its holding from 3,184,805 registered shares in Converium Holding Ltd, Zug, to 409,798 registered shares with 409,798 votes. This corresponds to a decrease from 7.96% to 1.02% of Converium registered shares with voting rights. These shares are held in various funds managed by Deutsche Bank. None of these funds is holding shares in an amount, which exceeds 5% of Converium registered share capital, and the shares are held for investment purposes. Deutsche Bank AG as a group holds Converium shares for own accounts and on behalf of various of its international subsidiaries for own account trading and asset management purposes. Disclosed share holdings in Converium Holding Ltd, Zug To-date the following interests have been previously notified to Converium Holding Ltd, Zug: -- Fidelity International Limited ("Fidelity"), Hamilton/Bermuda: 9.87% (date of notification April 28, 2003) -- Wellington Management Company ("Wellington"), LLP, Boston/Massachusetts, U.S.A.: 7.68% (date of notification January 11, 2002) -- Government of Singapore (GIC), Singapore: 5.08%, (date of notification July 11, 2003) Fidelity is an investment advisor, which provides investment advisory and management services to a number of non-U.S. investment companies or instrument trusts and certain institutional investors. Wellington is an investment advisor and portfolio manager having voting authority for 47 investment advisory clients, none of which has an individual shareholding in excess of 5%. GIC Government of Singapore Investment Corporation Pte Ltd (,,GIC") is a private company, wholly owned by the Government of Singapore and acts as a global asset manager. www.converium.com CONTACT: Converium Holding Ltd Michael Schiendorfer Media Relations Manager michael.Schiendorfer@converium.com +41 1 639 96 57 or Zuzana Drozd Head of Investor Relations zuzana.drozd@converium.com +41 1 639 91 20 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/ Martin Kauer ---------------- Name: Martin Kauer Title: CFO By: /s/ Christian Felderer ---------------------- Name: Christian Felderer Title: Group General Counsel Date: July 17, 2003