Billionaire Son Suffers Rare Stumble as T-Mobile Chase Fails

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Masayoshi Son’s inability to engineer a combination of his Sprint Corp. with T-Mobile US Inc. is a rare stumble for a dealmaker whose success made him Japan’s second-richest man.

Sprint, controlled by Son’s SoftBank Corp., ended talks with the fourth-largest U.S. carrier on regulatory concerns, a person with knowledge of the matter said. That leaves Son with Sprint, the No. 3 carrier in a market where it’s dwarfed by larger rivals and growing slower than T-Mobile.