An order (dark order) that is pegged to execute at the floating mid-point of the national best bid and offer (NBBO), with an option to assign limit price by a client. This order can trade with all contra flow irrespective of order size. Upon entry dark mid-point orders are eligible to trade against contra dark midpoint orders and dark limit orders. Such an order is only executed at the NBBO mid-point. And when the national price is locked or crossed, this order is not executable. Potential executions are protected by means such as freeze parameters and bid/ask tick limits. Orders traded at mid-point rounded last sale price and non-rounded last sale price are reported to the public.
This order always provides price improvement of a full trading increment (uptick, downtick), at least, unless the national price spread is one trading increment, in which case, the price improvement will be limited to half a trading increment.
A dark midpoint order is also known as a non-displayed midpoint order.
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