In the wake of a margin call that cost Green Mountain Coffee Roasters Chairman Robert Stiller his job, the WSJ analyzed the proxy statements of more public companies to cull other big names with big exposure. While many companies forbid pledging shares for personal margin accounts, FedEx (FDX) stands as one of 20 notables exceptions. CEO Fred Smith has nearly 5M shares tied to personal margin accounts or as collateral for loans and another 399K pledged for a family holding company.