The latest purchases bring the total spent on buybacks since March to 1 trillion yen ($9.5 billion). SoftBank has approved a further two tranches totalling 1.5 trillion yen which will provide continued support to the conglomerate's shares.

Chief Executive Masayoshi Son launched the buybacks, funded by a large-scale asset monetization plan, after the group's earnings were hammered by poor performance at the $100 billion Vision Fund.

SoftBank's shares closed up 5% on Monday and have risen almost 160% since their March trough, shrinking the gap between the share price and the value of the group's assets.

($1 = 105.7000 yen)

By Sam Nussey