The most expensive iPhone model could deliver profit margins of more than 55 percent for Apple Inc., according to iSuppli, which examined the components of the widely anticipated device.

Apple shares rose after the research firm said hardware and manufacturing cost $265.83 or about 55 percent of the $600 iPhone model, which has eight gigabytes of storage.

In January, iSuppli, which does not include costs for royalties and logistics, said it had estimated a $264.85 hardware and manufacturing cost for the eight-gigabyte device.

Apple shares rose $4.42 or almost 4 percent to $125.68 on Nasdaq after the news. Shares of AT&T Inc., the exclusive U.S. service provider for the phone, were down 35 cents at $41.50 on the New York Stock Exchange.