When I sometimes scan down after hours price changes, I notice tickers where there is a single last transaction that has a huge effect on the AH price.
This is not an anomaly. I see it everyday on a variety of tickers. Sometimes you see an AH transaction like these that is unexpectedly followed by a regular AH transaction. For example, in the attached image, if there happened to be another AH transaction at 5pm EST for say 58 shares at $8.21, some time after that, before AH close, there will be another single share transaction like the one at 4:02pm to drop the AH price by 8% in this example.
Who benefits from that price being skewed in one direction or another? Is this AH anomalous price used by institutions to determine if a trader/investor gets a margin call etc.?