SoftBank Group Corp. has decided to place the headquarters of its $100 billion technology private equity group in the hedge fund heartland of London, and has begun hiring investment advisers, Bloomberg reported. The giant tech fund, revealed by Tokyo-based SoftBank in October, has hired 10 people for its London office and may hire several dozen more, according to a person familiar with the recruitment drive. London is set to be the global hub for the Vision Fund, the person familiar with the fund said. SoftBank already has an office in San Francisco.