so there was one insider sell and 3 insider buys when the price was in the low $3's. not sure what to make of it. more shares were sold, but there were more insider buys than sells. i have a feeling the seller needed money for personal reasons and the buyers, knowing this, didn't want it to look like the insider sentiment was negative.
The VP of Quality Control sold off all of his shares (132,030) so one of three things happened: he got scared at the low price and sold off, he was being ousted by other top execs so selling would cause short term problems, or that maybe there is something wrong with Highpower batteries. I personally think that either he got scared or is being ousted. They passed the Sony audit so their battery quality must be pretty good.
you forgot the possibility that he is a human and sometimes humans want to buy things or sometimes humans need money for such things as a divorce settlement or to pay for a kid's college. i love how investors forget that corporate insiders live a life just like you and me.