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Why was the index option AMO market order rejected?

Index option AMO market orders are rejected as they are disallowed to prevent high-impact costs. This precautionary measure ensures that market orders are not executed at prices significantly different from the current market price due to limited liquidity. To avoid incurring high impact costs, it is recommended to use limit orders instead. To learn more, see What are limit and market orders ?

Did you know? To use a limit order as a market order, set the limit price higher than the expected market price for a buy order or lower for a sell order. This allows the limit order to be executed at or near the current market price. To learn more, see How to use limit order as a market order?