There is redemption committee in Finland Chamber of Commerce that will assign a arbitration court to handle the redemption. They will also assign a trustee who will represent the minority shareholders.

The valuation is decided during the arbitration process. From what I understand if there has been previous offer to buy it's quite likely that will be used at least as initial basis for the price.

There seems to be at least one English article about the process: https://insights.fondia.com/fi/en/articles/corporate-law/sha...