By Eric Reed Following stock indexes alone won’t tell you what’s really going on, the Action Alerts Plus team says. One of the quiet, but growing, problems in the stock market is the outsized influence held by a handful of companies. Just six firms, the FAANGs and Microsoft, make up between 20 percent and 25 percent of the entire S&P 500 (depending on specific prices on any given day). This creates… well, a lot of problems. Not only does it tie pretty much every investor in the United States to the decisions of a handful of CEOs or boards of directors, but it also undermines the pricing mechan…