Can I trade in fractions in the US overnight trading session?

Market data is provided free of charge during the US overnight trading session. 

Additional Information…

No, orders from Regular Trading Hours (RTH) and those orders marked to work outside RTH will not be eligible for the overnight session.

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Securities currently available to trade during the US overnight trading session are available here: Products & Exchanges

Additional Information…

The Overnight venue comprises multiple destinations. We display the best bid and ask from the included providers. 

Additional Information…