Vaisala Oyj — Major Shareholding Notification 2009

Nov 11, 2009

Disclosure 273938

Vaisala - Total number of voting rights and capital

Notification of change in share of ownership

Vaisala Oyj Stock Exchange Release November11, 2009 at 1:35 pm On November 10, 2009, Vaisala Oyj (Business ID 0124416-2) has received the following notification of change in share of ownership in accordance with the Security Markets Act, Chapter 2 § 9. According to the notification, Ilmarinen Mutual Pension Insurance Company's (Business ID 0107638-1) holding in Vaisala Oyj goes below five (5) per cent of the outstanding share capital of the company. Ilmarinen's proportion of Vaisala's share capital is 4,93 % and of the company's voting rights 1,09 %. More information: Jouni Lintunen, CFO, tel. +358 40 579 0181 www.vaisala.com Vaisala Oyj Distribution: NASDAQ OMX Helsinki Oy