Kioxia Holdings Corporation
  • Toshiba Memory Corporation (2018–2019)
  • Toshiba Memory Holding Corporation (2019)
Company typeJoint venture
FoundedJune 1, 2018; 5 years ago (2018-06-01)
Area served
Key people
Nobuo Hayasaka (President and CEO)
ProductsComputer memory
RevenueIncrease ¥1.53 trillion (FY2021)
Number of employees
c. 15,300 (2023)
Footnotes / references

Kioxia Holdings Corporation (/kiˈksiə/),[2] simply known as Kioxia and stylized as KIOXIA, is a Japanese multinational computer memory manufacturer headquartered in Tokyo, Japan. The company was spun off from the Toshiba conglomerate as Toshiba Memory Corporation (東芝メモリ株式会社, Tōshiba Memori Kabushikigaisha) in June 2018.[3] It became a wholly owned subsidiary company of Toshiba Memory Holdings Corporation on March 1, 2019, and was renamed Kioxia in October 2019.[4][5] In the early 1980s, while still part of Toshiba, the company was credited with inventing flash memory.[6] In the second quarter of 2021, the company was estimated to have 18.3% of the global revenue share for NAND flash solid-state drives.[7] The company is the parent company of Kioxia Corporation.


Kioxia is a combination of the Japanese word kioku meaning memory and the Greek word axia meaning value.[4]


See also: Toshiba § History

In 1980, Fujio Masuoka, an engineer at Kioxia predecessor Toshiba, invented flash memory,[8][9] and in 1984, Masuoka and his colleagues presented their invention of NOR flash.[10]

In January 2014, the Toshiba Corporation completed its acquisition of OCZ Storage Solutions, renaming it OCZ and making it a brand of Toshiba.[11]

On June 1, 2018, due to heavy losses experienced by the bankruptcy of the Westinghouse[which?] subsidiary of former parent company Toshiba over nuclear power plant construction at Vogtle Electric Generating Plant in 2016, Toshiba Memory Corporation was spun off from the Toshiba Corporation. Toshiba maintained a 40.2% equity in the new company.[3][12] The new company consisted of all of Toshiba memory businesses. Toshiba Memory Corporation became a subsidiary of the newly formed Toshiba Memory Holdings Corporation on March 1, 2019.

In June 2019, Toshiba Memory Holdings Corporation experienced a power cut at one of its factories in Yokkaichi, Japan, resulting in the loss of at least 6 exabytes of flash memory, with some sources estimating the loss as high as 15 exabytes. Western Digital used (and still uses) Kioxia's facilities for making its own flash memory chips.[13][14]

On August 30, 2019, the company announced that it signed a definitive agreement to acquire Taiwanese electronics manufacturer Lite-On's SSD business for US$165 million.[15] The acquisition closed on July 1, 2020.[16]

On July 18, 2019, Toshiba Memory Holdings Corporation announced it would change its name to Kioxia on October 1, 2019, including all Toshiba memory companies. On October 1, 2019, Toshiba Memory Holdings Corporation was renamed Kioxia Holdings Corporation and Toshiba Memory Corporation was renamed Kioxia Corporation.[3] This renaming also included companies associated with Toshiba's solid-state drive brand OCZ.[17]

In February 2022, Kioxia and Western Digital reported that contamination issues have affected the output of their flash memory joint-production factories, with WD admitting that at least 6.5 exabytes of memory output being affected. The Kiakami and Yokkaichi factories in Japan stopped producing due to the contamination.[18]

Corporate governance

As of April 14, 2024, Kioxia ownership is as follows:[3]


Kioxia Holdings Corporation is the holding company of Kioxia Corporation. Kioxia Corporation is the parent company of several companies including Kioxia Systems Company, Kioxia Advanced Package Corporation, Kioxia America, and Kioxia Europe.[12]


  1. ^ "KIOXIA at a Glance". Kioxia Holdings Corporation. Retrieved 21 April 2023.
  2. ^ "How to say KIOXIA". Kioxia. October 4, 2019. Retrieved September 20, 2020.
  3. ^ a b c d "Toshiba Memory to Buy Out Shares From Apple, Dell". Wall Street Journal. 2019-05-20. Retrieved 2020-08-18.
  4. ^ a b "Former Toshiba memory business to rebrand as Kioxia". ZDNet. 2019-07-19. Retrieved 2020-03-09.
  5. ^ "Establishment of Toshiba Memory Holdings Corporation". March 1, 2019. Archived from the original on September 6, 2019. Retrieved September 6, 2019.
  6. ^ "Unloved Toshiba Stock Is About to Reward Suitors Again". The Wall Street Journal. 2018-08-13. Retrieved 2020-08-18.
  7. ^ "DRAMeXchange - 【Market View】NAND Flash Revenue for 2Q21 Rises by 10.8% QoQ Due to Strong Notebook Demand and Procurements for Data Centers, Says TrendForce". Retrieved 13 November 2021.
  8. ^ US 4531203  Fujio Masuoka
  9. ^ Semiconductor memory device and method for manufacturing the same
  10. ^ Masuoka, F.; Asano, M.; Iwahashi, H.; Komuro, T.; Tanaka, S. (December 1984). "A new flash E2PROM cell using triple polysilicon technology". 1984 International Electron Devices Meeting. pp. 464–467. doi:10.1109/IEDM.1984.190752. S2CID 25967023.
  11. ^ Martyn Williams. "It's official: Toshiba owns OCZ's SSD business". PCWorld. Retrieved 20 March 2014.
  12. ^ a b "Company information | KIOXIA".
  13. ^ "Power outage causes Toshiba and Western Digital to lose 6 exabytes of NAND". TechSpot. July 2019.
  14. ^ "Power outage may have ruined 15 exabytes of WD and Toshiba flash storage". AppleInsider. July 2019.
  15. ^ Duckett, Chris (2 September 2019). "Toshiba Memory picks up Lite-On SSD business in $165 million deal". ZDNet. Retrieved 20 November 2019.
  16. ^ "Kioxia to Complete Acquisition of LITE-ON Technology's SSD Business". Kioxia. June 30, 2020. Retrieved March 29, 2021.
  17. ^ "Toshiba Memory will rebrand itself as Kioxia by October this year (Updated)". Retrieved 2020-03-18.
  18. ^ King, Ian (2022-02-09). "Western Digital, Kioxia Say Contamination Hurt Chip Output". Bloomberg News. Retrieved 2022-02-11.