Note that a Market Order is an instruction to trade your order at any price available in the market, subject to any additional instructions for handling/simulating the particular order type you specified, and other order conditions you specify when submitting your order.
A Market Order is not guaranteed a specific trade price, and may trade at an undesirable price. If you would like greater control over the trade prices you receive, please submit your order using a Limit Order, which is an instruction to place your order at or better than the specified limit price. Or, submit an algorithmic Market Order using IBALGO.
In accordance with our obligations as a broker, large Market Orders may be split into smaller orders, which will be traded over time. This is designed to reduce the impact of these large orders on the market, including the impact your order has on the market price.