IB at Close orders

[a5519]

Yesterday WWCA Buy at Close order filled at 4.9975.
Look at the last minute on the attached chart.
Is it normal ? This would mean that at close orders can not be used.

 

[def]

Market on Close work well with NYSE stocks as there is one closing print. You on the other hand were submitting a MOC for a NASDAQ stock. Since there is no closing auction for NASDAQ stocks, the order is simulated and sent to an exchange or ECN at 4PM as a market order. IMO, your best off submitting a limit order yourself for NASDAQ stocks.

 

[a5519]

Thank you, def, for clear response. It's necessary to be very careful with MOC orders.