Vaisala Oyj — Share Issue/Capital Change 2009

May 14, 2009

Disclosure 270325

Vaisala - Company Announcement

Conversion of unlisted shares series K into series A

Vaisala Oyj Stock Exchange Announcement 14.05.2009 at 12.00 Conversion of unlisted shares series K into series A Vaisala Oyj's 6000 unlisted shares (series K) have been converted into listed shares (series A). The conversion has been registered in the Finnish Trade Register May 14, 2009. Listing of the new series A shares has been applied for as of May 15, 2009. Further information: Jouni Lintunen, CFO, tel. +358 9 8949 2215 or +358 40 5790181 Vaisala Oyj Distribution: Helsinki Exchanges