Wall Street was mixed overnight, as shares of DuPont rallied, while biotech stocks dropped, and the International Monetary Fund downgraded its global growth forecasts.
In New York trading at about 2.15pm, the Dow Jones industrial average added 0.25 per cent. The Standard & Poor's 500 Index fell 0.5 per cent, and the Nasdaq Composite Index dropped 0.9 per cent.
The Dow moved higher as gains in shares of DuPont and those of Chevron, last up 8.8 per cent and 3.2 per cent respectively, outweighed slides in shares of UnitedHealth and those of Merck, down 3.5 per cent and 2.7 per cent respectively.
DuPont Chair and CEO Ellen Kullman said she will retire from both positions on October 16. Edward Breen, member of the DuPont board of directors, will assume the role of Interim Chair and CEO, the company said.
Shares of Illumina sank 12 per cent after the gene-sequencing company forecast fourth-quarter sales that fell short of analysts' estimates.