Masayoshi Son, CEO of SoftBank, has been weighing up various options for chipmaker Arm after Nvidia walked away from buying the company.
SoftBank is planning to cut at least 30% of staff at its ambitious investment arm, the Vision Fund, a source confirmed to CNBC's Deirdre Bosa.
At least 150 out of 500 Vision Fund workers will be impacted by the cuts, according to Bloomberg, which first reported the news on Thursday.
SoftBank Founder Masayoshi Son had foreshadowed cost cutting and a more conservative investment approach this summer after the company posted a $21.6 billion quarterly loss for the Vision Fund.
Still, he said at the time, Vision Fund headcount may need to be "reduced dramatically" with "cost reduction" needed across units.