Vaisala Oyj: SHARE REPURCHASE 22.5.2023 Published: May 22, 2023 Stock Exchange Releases VAISALA CORPORATION STOCK EXCHANGE RELEASE, 22.5.2023 VAISALA CORPORATION: SHARE REPURCHASE 22.5.2023 In the Helsinki Stock Exchange Trade date 22.5.2023 Bourse trade Buy Share VAIAS Amount 1,000 Shares Average price/ share 44.0159 EUR Total cost 44,015.90 EUR Vaisala Corporation now holds a total of 152 980 shares including the shares repurchased on 22.5.2023 On behalf of Vaisala Corporation Nordea Bank Oyj Janne Sarvikivi Sami Huttunen Additional information Paula Liimatta tel +358 9 8949 2020, [email protected] www.vaisala.com Vaisala is a global leader in weather, environmental, and industrial measurements. Building on over 85 years of experience, Vaisala provides observations for a better world, with space-proof technology even exploring Mars and beyond. We are a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services. Headquartered in Finland, Vaisala employs over 2,000 professionals worldwide and is listed on the Nasdaq Helsinki stock exchange. vaisala.com twitter.com/VaisalaGroup linkedin.com/vaisala Attachment VAIAS 22.5.2023 trades