1. Dictionary
  2. Must-Be-Filled (MBF) Order

Must-Be-Filled (MBF) Order

Orders placed before the market opens to buy or sell shares of stocks when their options expire. These orders are guaranteed a complete fill at the opening price to offset expiring options. They must be ordered between 4:15 p.m. and 5:00 p.m. on the Thursday before the third Friday of each month.

Share the Blog