Most Stock's can absorb a 1 million dollar selloff at most times however usually when under 5 dollars per share people actually hold the stock they sell first.
Correction Their selling to themselves, Not much difference between CIBC and BMO the visa and mastercard logo is almost indistinguishable.
The Brokerages have been doing this for a month now. At some point they may decide the risk reward ratio goes the other way and cover the short position. Just waiting for news on the Trader deal and the next earnings report.