I can say from having the misery of experiencing the dump, even an estimate would say that about 9 to 10 BILLION shares "came out of nowhere" and sold at market in 500M packets in January, February....then lessened....then drove us to nobid in august 2019. the trip 1 bid was 623 million. it was wiped out in 2 days.
so yeah, my best guess is 9+ billion "convertibles" used. 10B or 20B total shares? anybody's guess. rumor and board members who posted about it at the time and that one poster on global links thought 20 billion.