Well, let's see...
• they have information we don't have; or,
• they don't understand CXX; or,
• they just like buying and selling for the sake of it; or,
• they've found another stock better than CXX (what?! ); or,
• they want to have the $$$ in the bank (again ...what?!); or,
• they are just sick of having wet undies!!
Take your pick!!