Japan's SoftBank steps closer to transformation with mammoth mobile IPO

TOKYO (Reuters) - SoftBank Group Corp has won approval to conduct a 2.4 trillion yen ($21.04 billion) initial public offering (IPO) of its domestic telecoms business, in a deal that will seal the group's transformation into a top global technology investor.The IPO will be one of the biggest ever worldwide, and will provide the group with funds to pay down debt and continue placing big bets on innovations that Chief Executive Masayoshi Son predicts will drive future tech trends.SoftBank's bets..