Vaisala Oyj

Transaction in Own Shares • Jun 18, 2012

Disclosure 300548

Vaisala - Company Announcement

Vaisala Completed Share Repurchases

Vaisala Corporation Stock Exchange Release 18 June 2012 at 22:15 The share repurchases announced by Vaisala Corporation on 3 May 2012 have been completed. The Company has purchased during the time period from 14 May 2012 to 13 June 2012 through public trading in accordance with the rules of on the NASDAQ OMX Helsinki Ltd. and by contractual trade announced on 18 May 2012 a total of 150,000 Company's own series A shares at an average price per share of approximately EUR 15.17. The total purchase price paid for the shares was EUR 2,275 261.91. The Company holds a total of 159,150 series A treasury shares after the repurchases. Vantaa, 18 June 2012 Vaisala Corporation The Board of Directors Further information Kjell Forsén, President and CEO, Tel. +358 400 757 948 About Vaisala Vaisala is a global leader in environmental and industrial measurement. Building on 75 years of experience, Vaisala contributes to a better quality of life by providing a comprehensive range of innovative observation and measurement products and services for chosen weather-related and industrial markets. Headquartered in Finland, Vaisala employs approximately 1400 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange. www.vaisala.com Distribution NASDAQ OMX Helsinki Ltd. Major media www.vaisala.com [HUG#1620446]