The world’s largest semiconductor maker Intel has forecast third-quarter sales that may fall short of some analysts’ estimates as a slump in the personal computer market erodes its largest business.

Amazon.com, the world’s largest internet retailer, missed analysts’ second-quarter revenue and profit estimates as sales slipped for Kindle Fire devices and the company increased spending on new warehouses.

Apple’s much-hyped iPhone was unveiled this week after 30 months and millions of dollars in top-secret development.

INTEL’S sales forecast disappointed investors and signalled the world’s biggest chip-maker may be losing market share to Advanced Micro Devices.

Stocks rose today for the first time in three sessions although the market’s course was choppy as investors weighed upbeat earnings from Adobe Systems Inc against a brokerage downgrade of IBM.