Long term "smart money" is flowing into these stocks. The idea is that if there are a number of top money managers all buying the same stocks, they will support them on any retracement and more importantly, this is the list they are most likely to hold and add to if we enter a downturn in the market. These stocks will also tend to be the first bought after a market correction and outperform the indices on the way back up.
The key is to wait for these stocks to come into your personal risk buy zone, then confirm there is still Institutional Money Flow and then join them. Personally, I close out a position if it drops 10% at any point.
BTW, this same approach works on indices, futures, commodities, forex, ETF's, mutual funds, real estate, fine wine, classic cars, art etc... or anything that follows the auction market process.
IMF track record as of 12/5/16
Notice the S&P 500 has returned at its highest point 10% and the stocks held by the "smart money" tend to outperform.