MOC and MOO Order Cutoff Times: NYSE & Nasdaq
MOC and MOO order cutoff times on NYSE and Nasdaq, plus the later deadline after which an on-close order can no longer be cancelled or reduced in size.
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What Is the Opening Auction? How Stocks Open
What the opening auction is, how one 9:30 a.m. cross sets each stock's official opening price, and why the open can differ from the first trade of the day.