Stock indexes covered the gamut from flat to up to down Friday, with a barrelful of top-rated stocks taking hard hits. The Nasdaq slashed 0.6% lower, while the S&P 500 was essentially flat. The Dow Jones industrial average added 0.3%, helped by Nike’s (NKE) 4% gain. The IBD 50 slid 0.9%. Volume rose on both major exchanges. Friday was a Russell rebalancing day, which usually boosts trade.