The investor is one of three senior figures linked to the Remain-supporting campaign group Best for Britain who plan to launch a nationwide advertising campaign this month, which they hope will lead to a second referendum to keep Britain in the EU.
The campaign is trying to recruit major Tory donors in an attempt to undermine Theresa May.
It also plans to target MPs and convince them to vote against the final Brexit deal to trigger another referendum or general election, according to a strategy document leaked from a meeting of the group.
The document says the campaign, which will begin by the end of this month, must "wake the country up and assert that Brexit is not a done deal. That it's not too late to stop Brexit".