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Fill Outside Regular Trading Hours

Trading Term

A “Fill Outside Regular Trading Hours” refers to the execution of a trade during extended hours—specifically, the pre-market or after-hours sessions that occur outside the standard trading hours of 9:30 a.m. to 4:00 p.m. Eastern Time. These extended sessions allow investors to react to news events and other market developments that occur outside of regular hours.

Trading during these periods carries certain risks. Lower trading volumes can lead to wider bid-ask spreads, resulting in less favorable pricing. Additionally, increased volatility and reduced liquidity can make it more challenging to execute trades at desired prices. Investors should be cautious and understand these risks before engaging in extended-hours trading.

IBKR allows clients to place orders that can be executed outside regular trading hours. To enable this, traders must select the “Fill Outside RTH” (Regular Trading Hours) option when placing an order. This feature provides flexibility but requires an understanding of the associated risks.

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