Possibly m123, but don't rule out the simple possibility of tax loss selling in the US. The more the price nosedives, the more tempting it is for holders with some good profits elsewhere to sell, taking the loss against the profitable trades. This hold has stopped that, as long as it does not lift before the 1st. As US tax law stands, once sold, the stock cannot be bought back before 30 days and claimed as a tax loss. That is called a wash, and it is illegal to claim that as a tax loss. The sudden drop at the end, in particular, could have been tax sellers. It is unlikely the PBT434 P1 will be reporting any results before Feb, so PRAN would be a good candidate for US tax loss selling. All in my opinion and I am no expert.