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Semiconductor stocks whipsaw amid iPhone 7 sales, Intel guidance

Apple Store staff share high-fives with customers who have been waiting in line to purchase Apple's new iPhone 7 and 7 Plus at an Apple Store in Tokyo, Japan, September 16, 2016.
Issei Kato | Reuters

Funds that track semiconductor companies were pacing for their best week since at least May 27, though shares wavered Friday amid a slew of technology news.

The iShares PHLX Semiconductor ETF was up 4.24 percent in the past week, while the VanEck Vectors Semiconductor ETF was up 4.36 percent over the same period.

Among the top performers for the week were Cirrus Logic and Skyworks Solutions, both Apple suppliers. Skyworks is also closely correlated to shares of Intel, whose shares traded 3 percent higher as the company raised its third quarter revenue expectations.

Still, the stocks lost some momentum on Friday, as Apple turned lower and the wider market sank.

Apple has seen its shares rise more than 11 percent this week, as carriers report strong iPhone 7 pre-orders ahead of the retail launch on Friday. That's left Cirrus and Skyworks up about 13 percent and nearly 14 percent for the week, respectively. They did not immediately respond to an interview request.

The iPhone 7 and 7 Plus are the most pre-ordered devices in T-Mobile's U.S. history, the company announced on Thursday. The initial quantities of the iPhone 7 Plus are now sold out globally, Apple said earlier this week.

Pacific Crest analyst John Vinh said he views Cirrus is the biggest beneficiary of Apple's headphone-jack-free iPhone 7 design and lightning earpods. He also said that Skyworks has a positive near-term upward bias, as inventories of the iPhone 6s components are finally drawn down.

Apple has said it does not plan to release opening weekend sales for the iPhone 7 and 7 Plus. Intel, meanwhile, has been boosted by replenishing the PC supply chain, as demand for computers tick higher.