A system and method for managing and processing Market-On-Close orders for financial instruments by dynamically employing trading strategies according to settlement rules for financial instruments is provided. Techniques disclosed can include the use of an execution model that allows a trader to submit a MOC order using a trading system. The trading system can be configured to store settlement and validation rules corresponding to a given trading instrument and/or exchange and can be configured to execute the order according to the rules specified by an exchange. The model disclosed herein can rely on exchange mandated settlement rules and settlement times, can accept the order prior to the settlement time, and can manage the order according to parameters and details of the execution model and the settlement rules specified by an exchange for a given instrument.