By: Takahiko Hyuga, Min Jeong Lee
(Bloomberg) -- SoftBank Group Corp. announced a buyback of as much as ¥500 billion ($3.4 billion), an outlay that still leaves founder Masayoshi Son with a substantial pile of cash as he gears up to make more aggressive investments.Most Read from BloombergHow a Tiny Midwestern Town Became a Mecca for Modern ArchitectureAfrica’s Richest City Needs $12 Billion to Fix InfrastructureNYC Subway Riders See ‘Exceptionally High’ Air PollutionIn DNC, Chicago’s Embattled Transit System Faces a High-Profil