U.S. stocks

Major indexes were little changed in early trading Tuesday, though several stocks were moving on corporate news.

DuPont surged 10 percent after announcing that its embattled CEO Ella Kullman would leave.

PepsiCo rose 1 percent after the company announced reported profits that easily beat analysts' forecasts.

The Dow Jones industrial average edged up 10 points, less than 0.1 percent, to 16,786. It jumped 304 points the day before.

General Electric jumped 4 percent Monday after activist investor Nelson Pelts bought a stake in the company.

Twitter rose 5 percent after a long-running search for a full-time CEO concluded. Co-founder Jack Dorsey will have a second chance at leading the company.

The Dow Jones industrial average gained 188 points, or 1.1 percent, to 16,662 as of 11:45 a.m. Eastern time.

KEEPING SCORE: The Standard & Poor's 500 index slipped seven points, or 0.4 percent, to 1,912 as of 10:04 a.m. Eastern time. The Dow Jones industrial average slid 69 points, or 0.4 percent, to 16,212, and the Nasdaq composite fell 36 points, or 0.8 percent, to 4,583.

Major indexes rallied on Wednesday, but the market still ended the third quarter with its worst loss in four years.

All five of the biggest drops in the year occurred in the last three months as traders worried about slowing growth in China and uncertainty over U.S. interest rate policy.

The Dow Jones industrial average gained 235 points, or 1.5 percent, to 16,284.

Several stocks were moving on corporate news in early trading Wednesday.

Ralph Lauren jumped 13 percent after the company named a new CEO to replace the company's founder. The stock is still down sharply for the year.

Chesapeake Energy rose 3 percent after announcing that it would cut 15 percent of its workforce.

The Dow Jones industrial average gained 227 points, or 1.4 percent, to 16,275 as of 9:35 a.m. Eastern time.

Health care and materials companies fell the most in early trading Monday.

The Dow Jones industrial average lost 117 points, or 0.7 percent, to 16,198 as of 9:35 a.m. Eastern time.

The Standard & Poor's 500 index slipped 14 points, or 0.7 percent, to 1,917. The Nasdaq composite slumped 29 points, or 0.6 percent, to 4,657.

Alcoa bucked the trend, gaining 3 percent after saying it would split in two.

A late slump in health care stocks offset gains in financial stocks Friday.

Banks and other financial companies got a boost after Federal Reserve Chair Janet Yellen said that the central bank was still likely to raise interest rates this year.

Nike jumped 9 percent after posting strong earnings.

The Dow Jones industrial average climbed 113 points, or 0.7 percent, to 16,314.

Nike surged 7 percent early Friday, the most in the Standard & Poor's 500, after its results easily beat analysts' estimates.

The Dow Jones industrial average climbed 174 points, or 1.1 percent, to 16,376 as of 9:35 a.m. Eastern time Friday.

The S&P 500 rose 14 points, or 0.7 percent, to 1,946. The Nasdaq composite increased 34 points, or 0.7 percent, to 4,769.

Heavy equipment maker Caterpillar plunged 6 percent Thursday after lowering its revenue forecast and announcing a restructuring.

Joy Global, a maker of mining equipment, slipped 1 percent. Falling prices for copper and other basic materials have hurt those companies.

The Dow Jones industrial average lost 78 points, or 0.5 percent, to 16,201. It had been down 263 points earlier.

KEEPING SCORE: The Standard & Poor's 500 index fell 18 points, or 1 percent, to 1,919 as of 10:15 a.m. Eastern time. The Dow Jones industrial average dropped 188 points, or 1.2 percent, to 16,083. The Nasdaq composite fell 49 points, or 1.1 percent, to 4,702.