SECURITIES AND EXCHANGE COMMISSION

FORM 6-K

Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

[May 25, 2005]

Metso Corporation

(Translation of registrant’s name into English)
Fabianinkatu 9 A,
PO Box 1220
FIN-00101
Helsinki, Finland

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F  þ                    Form 40-F  o

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  o                    No  þ

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g-32(b):82-                    

Table of Contents

SIGNATURES

Date May 25, 2005

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf of the undersigned, thereunto duly authorized.

Name:

Harris Associates L.P.’s holding in Metso

(Helsinki, Finland, May 25, 2005) – Metso Corporation (NYSE: MX; OMX: MEO)

Metso Corporation has been informed about a decrease in the holding of the accounts managed by Harris Associates L.P. of the paid up share capital of Metso Corporation.

On May 19, 2005, the accounts managed by Harris Associates L.P. became the beneficial owners of 6,828,800 Metso shares. This holding amounts to 4.82 percent of the paid up share capital and the voting rights of Metso Corporation after being, on the basis of the previous announcement, 5.07 percent on March 24, 2003.

Metso is a global technology corporation serving customers in the pulp and paper industry, rock and minerals processing, the energy industry and selected other industries. In 2004, the net sales of Metso Corporation were approx. EUR 4 billion, and it has some 22,000 employees in more than 50 countries. Metso’s shares are listed on the Helsinki and New York Stock Exchanges.

For further information, please contact:
Olli Vaartimo, Executive Vice President and CFO, Metso Corporation, tel. +358 204 84 3010
Harri Luoto, Senior Vice President, General Counsel, Metso Corporation, tel. +358 204 84 3240

or

USA: Mike Phillips, Senior Vice President, Finance and Administration, Metso USA, Inc., tel. +1 770 246 7237.