A response to a Freedom of Information request about Softbank's trading activity has revealed that the Uber and Wework investor is under investigation.
The two payment services have a combined 75 million users.
SoftBank reported a record $8 billion in quarterly profits for its $100 billion Vision Fund on Monday.
The Chinese Uber for trucks Manbang announced Tuesday that it has raised $1.7 billion in its latest funding round.
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