Investors reacted positively on Thursday to the surprise appearance by Apple CEO Steve Jobs at the launch of the new iPad 2 a day earlier.
Jobs has been on medical leave since late January with an undisclosed condition.
In midday trading on the Nasdaq stock exchange in New York, the price of Apple shares had risen by more than six dollars to 358 dollars.
The new iPad is thinner, lighter and faster than its predecessor, which was launched last April.
Jobs’s reappearance comes as Apple’s rivals are launching their own tablet computers.
The new iPad goes on sale in Europe on March 25, with prices starting at 499 euros.