Sprint-T-Mobile deal: Masayoshi Son clinches biggest deal by letting it go

SoftBank Group Corp CEO Masayoshi Son has made a name for himself as the ultimate dealmaker, raising almost $100 billion for investments with his Vision Fund. Yet after four years of haggling, he scored his biggest deal by simply letting go.

The agreement on Sunday to combine SoftBank’s Sprint Corp with Deutsche Telekom AG’s T-Mobile US Inc will create a US wireless carrier with a market value of more than $80 billion, matching SoftBank's market capitalization and making it its biggest holding.

SoftBank, a Japanese technology and telecommunications group, will own just 27 percent of the combined company, however, while Deutsche Telekom