With the help of Apple, the world's largest company by market capitalisation, the tech-heavy Nasdaq gained 14.20 points (0.46 per cent) to 3076.59.
Trade got a little help from a rise in the University of Michigan Consumer Confidence index, which came in slightly higher than in July at 73.6, still well below pre-recession levels.
But consumers' expectations of future conditions worsened, the sub-index falling to 64.3 from 65.6.
"Clearly consumers feel times aren't as bad as they were just a month ago, but looking into the future there remains a considerable amount of uncertainty and downside risks that could undermine the recovery," said Lindsey Piegza of FTN Financial.
Caterpillar added 1.6 per cent after tentatively reaching a new contract deal with workers at its Illinois plant who had been on strike since May.
Clothing retailer Gap rose by 4.8 per cent after turning in a 20 per cent rise in second-quarter earnings and raising its forecast for the full year.
Sports shoe chain Foot Locker reported a 59 per cent rise in quarterly profit, pushing its shares 1.7 per cent higher.
American bond prices gained after falling three straight days. The 10-year US Treasury yield fell to 1.82 per cent from 1.84 per cent on Thursday, while the 30-year moved to 2.93 per cent from 2.96 per cent. Bond yields move inversely to prices.
-AFP, AAP