Stocks up in morning trading, extending gains from Wednesday

The S&P 500 index rose 10 points, or 0.4%, to 2,708 as of 9:53 a.m. Eastern Time. The Dow Jones industrial average climbed 91 points, or 0.4%, to 24,634. The Nasdaq added 24 points, or 0.3%, to 7,364. The Russell 2000 index of smaller-company stocks picked up 3 points, or 0.2%, to 1,599.