Sprint owner SoftBank will sell most of its T-Mobile shares

SoftBank World Group, which had been the Sprint Corp. majority owner, said it would sell two-thirds of its stake in T-Mobile next week.  Sprint Corp. merged with T-Mobile US Inc. in April. Softbank's transaction would be worth about $20 billion, CNBC reports. Softbank owns a total of about $31 billion shares of T-Mobile, according to FireWireless.  Softbank has been strapped for cash recently. Its $100 billion Vision Fund has underperformed, and WeWork failed to go public after the company invested…