Market breadth was terrible: More than 410 stocks in the S&P 500 were set to close lower. The Nasdaq was on track to fall for a fourth day in a row for the first time since April, according to Dow Jones Market Data. After trading sideways for most of the morning, the Nasdaq Composite was down 0.5% in early afternoon trading. The S&P 500 was down 0.8%. The Dow was down 412 points, or 0.9%. Stock market selling accelerated as Tuesday's session rolled on. ...

Market Overview - The stock market is experiencing a significant decline, with the S&P 500 down 0.9%, the Dow off 220 points (0.5%), and the Nasdaq Composite down 1.3% [1] Vulnerability Assessment - According to Jonathan Krinsky, BTIG's chief market technician, equities are currently the most vulnerable to a downside move since the lows observed in April [1]