[BRIEFING.COM] The Dow Jones Industrial Average fell about 200 points over the last half hour.
Mega caps and tech stocks have an outsized impact on major indices, but many stocks are participating in downside moves. The market-cap weighted S&P 500 trades 2.1% lower and the equal-weighted S&P 500 trades 1.6% lower.
The Vanguard Mega Cap Growth ETF (MGK) trades 2.9% lower.