Why would someone intentionally suppress the price of a rising stock? They are selling stock that has a strong uptrend. Not like there is any meaningful short position to scare people for. Not like there are market makers since these trades are "Smart" trades.
Quite possibly to give the illusion/perception the shares are not as high as they should be? maybe can't reach/hold milestone price of $10.00? any number of reasons - whether short, or possibly looking to take a much larger long position.