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Vaisala Corporation observes the Insiders Guidelines issued by Nasdaq Helsinki Ltd. The Company maintains its public and company specific insider registers in the Euroclear Finland Ltd's Sire system. Public insiders and information on their up-to-date ownership, together with transaction history covering 12 months, of Vaisala's shares are disclosed here. 

In accordance with the Securities Market Act, Vaisala Corporation's public insiders comprise the members of the Board of Directors, the President and CEO, the members of the Management Group and the auditors. Those persons, who on the basis of their employment or other contractual relationship with the Company and on account of their position or duties have regular access to insider information, are included in Vaisala's company-specific insider register. Persons to whom the Company discloses insider information related to a specific project are included in Vaisala's project-specific insider registers.​

Vaisala observes a silent period which starts at the end of the reporting quarter and ends on the publication of the respective quarterly or annual results. During this time, the permanent insiders are prohibited from trading in Vaisala's shares. Project-specific insiders are prohibited from trading in Vaisala's shares until the project in question has been cancelled or disclosed. Vaisala's insider registers are maintained by the Legal department.