The only example that I remember was one in which some additional factors were involved and I believe it was exwannabe that pointed out that shares were being traded right before the halt in trading when those shares were known to be at risk but the time frame was not well known. As I recall, the issue was that there were more shares sold short in that ticker than total shares issued by the company which started all the problems when ownership resolution needed to occur. I don’t remember the ticker off hand but it was discussed here often over the years in the context of naked shorting. Best wishes.