 Wall Street headed for a down week after yesterday's sell-off. The Dow giving up a good chunk of this week's gains. The index lumped more than 500 points. Both the S&P and the Nasdaq still sliding on big tech losses. Mega cap technologies continue to underperform. The Magnificent Seven stocks suffered their worst market cap loss in two years this week. Nvidia reversed course yesterday, still down close to 5% in this week's trading. Apple, Amazon, and Alphabet all headed for sharp weekly losses.