SoftBank Group Corp. said Wednesday it swung back to profitability with a net profit of 636.15 billion yen ($4.1 billion) in the nine months ended December due to the increased value of its investment portfolio, while unveiling an additional investment of $1.5 billion in U.S. artificial intelligence startup OpenAI.The turnaround of the Japanese technology conglomerate in the April-December period, the first in three years, followed a net loss of 458.72 billion yen posted a year earlier. Revenue rose 6.0 percent to 5.30 trillion yen.The additional investment in OpenAI was made in January, ra…READ FULL ARTICLE