RE: Crash at end? Not looking good24 Dec 2021 19:35
Licker - this UT does matter.
After 16:30, any unprocessed trades that are in the system get reconciled, and the UT amount and value represent those that were not balanced out. So when you have 305,164 shares at 225, well below the median price at close, it means that there 305,164 more shares sold than bought during that narrow post-close period and the average price was 225 per share.
But the story is complicated by the fact that the market stays open again for about 1.5h for select entities, so there can be additional trades placed after the UT is logged.