Aurora Cannabis Inc (ACB)

[Edward]

They could be hedging themselves.Maybe they are long and short.If the stock goes up they could sell their long position and if it goes down , cover their short with a purchase and maintain their long position.They could make money both ways, or if it goes way up and they miss it, they can close their short position by pairing off their long position, thereby locking in the gain if they bought low and shorted ACB at a higher price.