规定不一样,提前一天EXPIRE,很多券商(如IB)标错了.应该是THURSDAY,估计有很多冤大头买家.卖家可多0.X%的利润.周四4:00PM最后全部COVER

Quarterly options will trade based on a calendar quarter - with endings in March, June, September and December - and will expire on the last business day of each respective month. Regular monthly options typically expire on the Saturday following the third Friday of each month. Initially, CBOE will list options with Quarterly expirations for a period of one year.