Vaisala Oyj — Share Issue/Capital Change 2011

Dec 22, 2011

Disclosure 296107

Vaisala - Company Announcement

Vaisala Corporation: Conversion of unlisted shares series K into series A

Vaisala Corporation Stock Exchange Release 22.12.2011 at 12.00 Vaisala Oyj's 333 unlisted shares (series K) have been converted into listed shares (series A). The conversion has been registered in the Finnish Trade Register December 22, 2011. Listing of the new series A shares has been applied for as of December 23, 2011. Further information: Kaarina Muurinen, CFO, +358 40 577 5066 Vaisala Corporation Distribution: NASDAQ OMX Helsinki [HUG#1573171]