UPM-Kymmene Corporation Stock Exchange Release (Other information disclosed according to the rules of the exchange) September 18, 2026 at 12:20 EEST

HELSINKI, Sept. 18, 2026 /PRNewswire/ -- The Finnish Financial Supervisory Authority has today, on September 18, 2026, approved a supplement to the Finnish language demerger and listing prospectus concerning the partial demerger of UPM-Kymmene Corporation ("UPM") and application of the shares in WISA Group Plc ("WISA") to be admitted for trading on the regulated market of Nasdaq Helsinki Ltd. The planned completion date of the demerger ("Demerger") is October 31, 2026. Trading in the shares of WISA on the regulated market of Nasdaq Helsinki Ltd is expected to begin on November 2, 2026, or as soon as reasonably possible thereafter.