PAA, A New Dawn , FDA ODD Approval and Entering Phase II MND Trial, page-492

But they are not the same people. It's more likely to be the people that sold yesterday for 24c are the same ones that are buying back today for 20.5c. i.e. day traders. That's a nice little 10+% return for 24 hours wait. They make a living out of the market so can read (and influence) it better that most of us. Trouble is that they'll likely be the same people that sell again next time we get some good news which raises our SP, in fact they are relying on it.

Best defense is to be a LTH and don't worry about day to day movements. I picked up some more at 21.5c but with zero intention of selling so I can't really complain.