Facility

Kioxia Yokkaichi K6 (Flash Ventures JV with WD)

Kioxia Yokkaichi complex (Mie Prefecture) is the world's most unique large-scale semiconductor manufacturing arrangement: the K6 plant (and earlier Yokkaichi buildings) is a 50/50 joint venture between Kioxia and Western Digital, operated through Flash Ventures LLC. Both companies share cleanroom space, process technology, wafer starts, and equipment within the same physical fab — an arrangement with no parallel in the industry. The Yokkaichi complex has grown through multiple generations (Y1-Y6 buildings) since 1992 (originally Toshiba Memory). Yokkaichi K6 produces BiCS FLASH at 162-218 layer generations. Combined Yokkaichi+Kitakami capacity: ~330,000 NAND wspm representing approximately 33% of global NAND supply. A single seismic or fire event at Yokkaichi would simultaneously reduce Kioxia and Western Digital output — two separate companies — by roughly 33% of global NAND in one event. Source: https://www.nikkei.com/article/DGXZQOUF074KI0X00C22A6000000/