Shares in SoftBank Group plunged as much as 10 per cent today after the Japanese tech investor said it had sold all its stock in US chip titan Nvidia for US$5.8 billion (RM23.9 billion).

SoftBank’s latest financial manoeuvres highlight a familiar tension for the Japanese group: balancing Masayoshi Son’s appetite for high-risk, high-reward bets with the practical limits of its own bala...