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have sometimes taken advantage  of those shifts  lobbing 'dream bids '  near the close and  testing out the after-market auction  ( and lowering the order ready  for the next day's trading  , after the market is closed )

 don't forget those  'active' ETFs working their magic ( or dastardly deeds )  sometimes they need to quickly shift  from one stock to another  if the mandate requires it  ( say if FMG was to become  an acknowledged 'green stock '  or AGL  is back to  'a dirty fossil fuel player ' )