Definition of 'Market On Close - MOC'
A non-limit (market) order executed as close to the end of the market day as possible. All market on close (MOC) orders must be submitted by 3:45pm on the NYSE and by 3:50pm EST on the Nasdaq. Neither exchange allows for the modification or cancellation of MOC orders after those times.
Also known as an "at-the-close order."
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