The Securities and Exchange Commission (SEC) is seeking to find out whether Arora had conflicts of interest or engaged in questionable behaviour, Bloomberg News reported, citing unnamed people familiar with the matter.
The watchdog was also eyeing SoftBank's disclosures to investors, it said, adding that the inquiry was a preliminary step and does not guarantee further action against the company or its former executive.
"SoftBank Group does not comment on press reports of (US) regulatory inquiries," the company said in a statement today in response to the report.
Son told an annual shareholders meeting he had changed his mind about the timeline for stepping down to make way for right-hand man Arora.
Both men said it was an amicable split, and Arora would stay on as SoftBank advisor.
But his resignation came as SoftBank said an independent group of board members had cleared Arora of misconduct allegations lodged by an investor group.
The shareholders were calling for Arora's ouster over potential conflicts of interest tied to his role as an adviser to a private equity firm.
SoftBank's Tokyo-listed shares were down 1.02 per cent at 5,749 yen (USD 56) at midday.
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