Stocks were modestly higher at the open today, after JPMorgan topped estimates in the first quarter and Nokia met them. The Dow inched up 31 points, while the Nasdaq and S&P rose 16.9 and 4.08 points, respectively. JPMorgan added 1.7%, while Nokia rose 12%. Traders were watching Rosetta Stone, which began trading publicly today, priced at $18 a share. (More stock market stories.)