WeWork impresario Adam Neumann, Chinese latte mogul Lu Zhengyao and now Markus Braun, the fallen star of German fintech - all have exposed the perils of one of the biggest money manoeuvres in the C-suite: borrowing money against stock in your own company.

Braun had to sell much of his stake in Wirecard to meet margin calls on a $170m (R2.8bn) loan he'd secured against about half of his ownership.

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