I worked for years for IBM. I had a company card. Initially, there was no personal guarantee, then they changed the policy. It had to do with corporate accounting too. If a person has a company card, it can be abused and you can be fired. Personal guarantees changed that. IBM could choose whether or not the expense was properly documented and the expense was a necessary business expense. I had to pay the bill and expensing was back on me. We had Diners Card and AMEX.