TOKYO, Aug 10 (Reuters) - Japan’s SoftBank Group Corp on Tuesday reported a 39% fall in first-quarter net profit, even as Vision Fund returns were boosted by listings during the period. April-June profit was 762 billion yen ($6.9 billion). That compared with profit of 1.3 trillion yen in the same period a year earlier. ($1 = 110.3400 yen) (Reporting by Sam Nussey; Editing by Christopher Cushing) Our Standards: The Thomson Reuters Trust Principles.