Apple Inc. said on Monday that last week's rollout of iOS 9 marked the "fastest iOS adoption ever," with more than 50% of existing devices upgrading to the new mobile operating system just five days into its launch. "Customer response to the iPhone 6s and iPhone 6s Plus has been incredibly positive," Apple Senior Vice President of Worldwide Marketing Philip Schiller said in a statement. The new iOS, he said, is on pace to be downloaded by more users than any other software release in Apple's history. The company began taking preorders for its newest smartphones, the iPhone 6s and iPhone 6s Plus, on September 12. It will begin selling the new hardware in retail stores this Friday. Shares of Apple were up 0.6% to $114.09 in premarket trade. They are down about 10.5% over the last three months, just underperforming the broader Dow Jones Industrial Average, down 9%.
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