Investopedia explains 'Batch Trading'
Generally speaking, batch trades are confined to high-volume stocks that are not overly price-sensitive. Furthermore, to qualify as a batch trade, the security in question must be trading at the price specified in the order (if it was a limit/stop order). Batch trading is restricted to the market open in the U.S. so as to ensure that the stock's price is fair and just, i.e. not fluctuating wildly from one batch trade to the next.
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