The institutions are holding overnight or longer, so it is swing trading. However, the idea is that institutions are running a cycle of buying and selling in a few days time using millions of dollars and sometimes making just pennies per share. Like cream that rises to the top, they skim these profits with their computer robots. The base is provided by you and me, as we invest in our 401(k) plans, where some of the funds find their way into large cap, where there is perceived relative safety. Most trades are long trades, and the repeated systematic process is undermining the stocks real value. The ordinary investor may receive a variable but smaller return for buy and hold, compared to the institutions as they clean up. I suppose one could argue that a stock will gravitate towards an equilibrium price in line with earnings. However value that could have been stock splits and returned to the ordinary investor has been taken away.