An abbreviation for contra midpoint only plus; an order that is priced at the midpoint of the protected national best bid and offer (NBBO), while it is subject to a randomized millisecond delay (400 to 600 ms) upon entry. The investor/ trader has the option to interact against only other resting contra midpoint only plus orders or against all resting midpoint-eligible dark liquidity.

This type of order provides an set-up for like-minded investors to interact with each other for order execution.