Masayoshi Son’s Next Bet May Finally Secure His Legacy: Review

Seven years ago, just before Masayoshi Son turned 60, a reporter asked how the tech investor graded himself on a scale of 1 to 100. The billionaire’s response: 28.

“What have I accomplished?” the founder of Japan’s SoftBank Group Corp. said. “There’s so much I would have done differently, and I feel so frustrated thinking back to all the times I fell short. But this is not the end.”

Son was then funneling billions of dollars of Saudi and Abu Dhabi money into hundreds of fledgling companies, rewriting the rules of venture capital and financing the world’s largest startup ...