Fractional shares order execution methods

A method for executing a notional-based buy order, comprising:

• receiving, by a processing unit including at least one processor communicatively coupled to a non-transitory processor-readable medium storing processor-executable code, a first estimated fractional share component of a notional-based buy order having a first amount, where
• the first estimated fractional share component is comprised of a calculated quantity;
• providing the first estimated fractional share component to a first queue;
• recalculating the calculated quantity of the estimated fractional share component;
• providing a second estimated fractional share component comprised of the recalculated quantity to a second queue after a trade of an estimated whole share component of the notional-based buy order is executed;
• determining whether a sufficient quantity of fractional shares is stored in a fractional shares database;
• executing, if a sufficient quantity is stored, a buy of fractional shares from the fractional shares database;
• determining a second dollar amount for the second estimated fractional share component;
• adjusting the second estimated fractional share component as a function of the first amount;
• and
• generating a report upon the completion of the first transaction or the second transaction.

A method for executing a notional-based sell order, comprising:

• receiving, by a processing unit including at least one processor communicatively coupled to a non-transitory processor-readable medium storing processor-executable code, a quantity of an executed whole share component of a notional-based sell order having a first amount;
• calculating a second amount of the executed whole share component;
• determining whether an oversell condition of the notional-based sell order exists;
• performing, if an oversell condition exists, a first transaction comprised of:
• providing a quantity of the executed whole share component commensurate to the oversell to a fractional share database;
• and
• performing, if an oversell condition does not exist, a second transaction comprised of:
• calculating a quantity of shares commensurate to a difference in the first amount and the second amount;
• performing an execution if the calculated quantity meets a minimum quantity for execution, and
• cancelling an execution if the calculated quantity does not meet a minimum quantity for execution.

A method for executing fractional shares transactions, comprising:

• receiving, by a first processing unit including at least one processor communicatively coupled to a non-transitory processor-readable medium storing processor-executable code, a report from a first communications unit indicative of an execution of a trade order of funds or securities provided by the first processing unit to a second communications unit;
• determining whether a portion of the executed funds or securities is capable of being fracked;
• allocating a first portion capable of being fracked to at least one first subaccount;
• and
• providing a second portion not capable of being fracked, if any, to at least one second subaccount, whereupon
• the funds or securities of at least one second subaccount become available for liquidation by a second processing unit.