开云体育

Hi everyone, I know the TWS scanner with the 'Top % Gainers' parameter works outside regular trading hours. However, I’m confused about how the % change is calculated for stocks during pre-market hours.

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Specifically, does the % change compare the current pre-market price to the close price of the previous trading day, or does it compare the current pre-market price to the close price of the day before that?

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For example: if it’s Wednesday pre-market, is the % change based on the comparison of the current pre-market price of the stock and the stock’s price at Tuesday’s regular hours close, or is it compared to Monday’s regular hours close?