Micron Technology on Friday took ownership of Numonyx B.V., a Swiss company that makes NOR memory for cell phones, mp3 players and other small devices.

In an all-stock transaction valued at $1.2 billion, Micron issued about 138 million of its own shares to the 2-year-old privately held firm's owners - chipmakers Intel Corp. and STMicroelectronics N.V., plus Francisco Partners, a private equity firm that invests in technology - and assumed outstanding restricted stock units held by Numonyx employees.

"With this acquisition, Micron builds on its position as one of the world's leading memory companies with increased scale, a broader product portfolio and industry-leading technology," Micron CEO Steve Appleton said.

Micron announced the deal to acquire Numonyx in February. Micron said then that the purchase would increase the number of outstanding Micron shares by about 15 percent.

NOR (short for not-or, a computer-logic term) is a type of flash memory Micron hadn't made for years. Flash memory is nonmoving memory that retains data when power is turned off. NOR is often used to store executable code and is common in mobile devices.

NAND (not-and) is a more common type of flash memory that is Micron's second-biggest product category, after dynamic random-access memory, or DRAM, the most common type of memory in personal computers.