Be careful working with this user. There is risk that he's trying to get your personal data to steal your money.
What kind of personal data? Could you share the conversation you had with OP?
And I am pretty sure that there will be some amount of personal information that has to be shared by the trader with OP's company (if they are legit).
They are talking about millions of $$, without thorough verification, how can you expect them to hand over so much money to a virtual stranger?