It appears that SoftBank also made a huge profit on Sprint. Although it was less than they initially expected and took much longer to exit.
https://www.wsj.com/articles/softbanks-boss-bet-22-billion-o...
https://www.wsj.com/articles/softbanks-boss-bet-22-billion-o...
Softbank's "investment strategy" would've ended the company decades ago if it didn't buy a quarter of Alibaba for $20m, a share that would end up being worth over $100b a few years ago.