November 19th, 2003, 5:34 pm
You can trade a European option at any time. However, all publicly traded options are American, so a European will be over-the-counter. Any OTC option is a private contract, and you generally cannot assign it. This is not a practical problem if you deal with large professional counterparties using standard documentation, but it can be in other cases.When you buy a publicly traded option on an exchange, your contract is with the clearinghouse, not a specific counterparty. If you later sell the same option on the same exchange, the contracts cancel. But if you buy a call from JPMorganChase and sell an identical call to Citigroup, the two do not cancel. When JPMorganChase goes bankrupt can the call expires in the money, you will owe money to Citigroup that you may not be able to collect from JPMorganChase.