Why not more trading???Investor sentiment,that's it.The market doesn't usually use logic,most of the time it is simple.....fear and greed.There is logic sometimes,but there can be many variables involved,charts patterns is a good one,then there is how important one member of management may be viewed,lose this certain one,and boom,share price dives,then again,add one of importance,and again boom,this time it goes up.Where is the logic in that?There isn't any,unless you want to surmise the addition or loss of a CEO/CFO,etc,will somehow affect the revenues of a company,and sometimes it not even that,it could be who this person knew,or was related to,or how he/she may defect to a competitor...it goes on,and on.