some of the small ones could people just finishing a buy or sell especially when you see a very small amount selling at a lower price it more then likely the person had just those left and wants it all sold in one order on the same day so not to have to pay extra fees...when I play pinks where I have say 1 million shares and I want to sell I'll do an all or none which works if there is a very huge volume moving and that way I do it all for one fee.