SoftBank Group Corp. (OTCPK: SFTBY) has raised over $15 billion by offloading its high-profile stakes in T-Mobile US Inc. (NASDAQ:TMUS) and Nvidia Corp. (NASDAQ:NVDA), as detailed in its fiscal second-quarter earnings report.SoftBank Sells NVDA, TMUS To Fund AI PushThese sales are part of a continued financing initiative for large-scale investments, most notably its massive follow-on commitment to ChatGPT maker OpenAI.The Japanese conglomerate sold its entire stake in U.S. chip designer Nvidia in October. T ...