HELSINKI (Reuters) – The chairman of Finnish insurer Sampo Bjorn Wahlroos, a veteran of the Nordic country’s financial industry, said on Wednesday he would step down in 2023. “I will today announce that I will no longer stand for re-election next year,” he told a conference call after Sampo’s annual shareholder meeting. Wahlroos, who turns 70 later this year, said he would also step down as chairman of Finnish forestry group UPM Kymmene next year. Sampo told the market that the Norway-based holding company Becasse, which is owned by Wahlroos, had sold 900,000 Sampo shares. “I’ve been transferr…