The Mysterious Finances of the Brexit Campaign’s Biggest Backer

Ever since Brexit supporter Arron Banks made the largest political donation in British history he’s been dogged by questions about where he got the money.

For a man who told the Financial Times he was worth 100 million pounds ($130 million) in 2015 and made the Sunday Times Rich List two years later with 250 million pounds, his 8 million-pound outlay wasn’t necessarily that striking. But is Banks—who is at the center of a criminal probe into the financing of the campaign to leave the European Union—really that wealthy?