Vaisala - Company Announcement

Conversion of unlisted shares series K into series A

Vaisala Corporation            Stock Exchange Release            December
22, 2010 at 12.00


Vaisala Oyj's 4000 unlisted shares (series K) have been converted into listed
shares (series A). The conversion has been registered in the Finnish Trade
Register December 22, 2010. Listing of the new series A shares has been applied
for as of December 23, 2010.


Further information:
Jouni Lintunen, CFO, +358 40 5790181


Vaisala Corporation



Distribution:
NASDAQ OMX  Helsinki Oyj


[HUG#1474182]