Pedestrians wearing protective masks walk past signage for SoftBank Corp. near a store in Tokyo, Japan, on May 15, 2020.Shares of SoftBank Group plunged as much as 10% Wednesday after the Japanese giant said it had sold its entire stake in U.S. chip giant Nvidia for $5.83 billion. The capital will be used to fund SoftBank's$22.5 billion investment in ChatGPT parent OpenAI, a person familiar with the matter told CNBC.Shares of SoftBank Group last traded more than 6% lower.In its earnings report, SoftBank sa ...