Apple has asked its parts suppliers to manufacture about 20 percent fewer components for iPhones in the second half of 2018, the Nikkei on Friday reported, sending the iPhone maker's stock down.

According to the report, Apple expects total shipments of iPhones to be launched this year to be 80 million, less than the 100 million shipments that Apple planned for around the same time last year.

Shares of Apple, which usually launches iPhones in the second half of the year, fell 2.2 percent to $189.20 in premarket trading. Supplier AMS AG dropped as much as 6.7 percent. Other European semiconductor stocks including Dialog Semiconductor Plc, STMicroelectronics NV and Infineon Technologies AG all slipped.

Apple plans to introduce three new iPhones in 2018, according to reports, and is set to start shipping in September after Apple's annual product launch.

Apple did not comment.