If the trades are being cancelled, are they going to correct the chart data? Right now it looks very misleading on the daily[0], weekly, monthly, quarterly, yearly etc for large caps that trade quite steadily otherwise. I do understand that this would be a challenging effort as that data already flowed to and was stored by all the broker-dealers, but I think it should be done.
[0] https://www.dropbox.com/s/6jdmgkdyei9xqz0/mcd.png?dl=0