The late-afternoon selling came during a relatively quiet week for Wall Street. Traders said the selling might be tied to large mutual funds having to rebalance their portfolios ahead of the end of the quarter next week. Other traders pointed to the ongoing violence in Iraq as a reason to pull out of the market ahead of the end of the quarter.
The Dow Jones industrial average fell 119.13 points, or 0.7 percent, to 16,818.13. The Standard & Poor’s 500 index lost 12.63 points, or 0.6 percent, to 1,949.98 and the Nasdaq composite fell 18.32 points, or 0.4 percent, to 4,350.36.
The Dow fell more than the S&P 500 and Nasdaq as investors sold large, brand-name stocks. Exxon Mobil, Boeing, American Express and JPMorgan Chase all fell 1 percent or more.
The selling in blue-chip stocks marks a recent and notable change in trader behavior. Stocks of large, diversified companies have been among the most popular with investors this year. With the quarter end and mid-year approaching, it’s not uncommon for investors to sell some of the best performing names to rebalance their portfolios.
Vertex Pharmaceuticals was a bright spot in the S&P 500. The drug company soared $26.92, or 40 percent, to $93.53 after Vertex said its treatment for cystic fibrosis appeared to work better than a placebo in a late-stage study. Vertex plans to seek approval for the treatment in the U.S. and Europe.
Traders say it’s a positive sign to see investors heading back into biotechnology stocks. The sector was among the hardest hit in March and April. Even with today’s declines, the S&P 500 Biotechnology index rose 1.3 percent.
“That was a growth area that worried a lot of people, but the news out of Vertex is very bullish,” said Ian Winer, director of stock trading at Wedbush Securities. “The news has renewed a risk appetite in that space we have not seen in months.”
Micron Technology jumped $1.24, or 4 percent, to $32.50, making it the second-biggest advancer in the S&P 500. The semiconductor maker reported better-than-expected earnings and raised its forecast for the next quarter. Dow component Intel, another major chipmaker, rose 27 cents, or 0.9 percent, to $30.50.
Homebuilder stocks also did well Tuesday after the Commerce Department said sales of new homes jumped 18.6 percent in May to an annualized rate of 504,000. That’s the highest level since May 2008.
International concerns remain an issue for investors as well. The United Nations said Tuesday that more than 1,000 people, mostly civilians, have been killed in Iraq so far this month, the highest death toll since the U.S. military withdrew from the country in December 2011. In the United Arab Emirates, Dubai’s stock market fell 6.7 percent Tuesday and Abu Dhabi’s fell 3.3 percent.
Bond prices rose as investors sought safety amid the stock market declines. The yield on the 10-year Treasury note fell to 2.58 percent from 2.63 on Monday.