What's the biggest amount anyone has in treasury bonds or gold? You could easily liquidate a ton of that.

> but what happens when he only gets $70mil for it because the stock price tanked? Should he sell more, until he comes up with that original 20% of his "billion"?

If the stock tanks that much while he's selling, then the company is only worth about $300 million now, and the money he owes drops to $60 million.

Though I don't see why it would tank that much.