Last updated
Kioxia Holdings Corporation
  • Toshiba Memory Corporation (2018–2019)
  • Toshiba Memory Holding Corporation (March 2019–October 2019)
Type Private
Industry Electronics
FoundedJune 1, 2018;3 years ago (2018-06-01)
Area served
Key people
Products Computer memory
Number of employees
  • 80 (KHC only)
  • 12,000 (total)

Kioxia Holdings Corporation ( /kiˈksiə/ ), [1] 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 Kabushiki-gaisha) in June 2018. [2] It became a wholly owned subsidiary company of Toshiba Memory Holdings Corporation on March 1, 2019 and was renamed to Kioxia in October 2019. [3] [4] In the early 1980s, while still part of Toshiba, the company was credited with inventing flash memory. [5] 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. [6] 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. [3]


In 1980, Fujio Masuoka, an engineer at Kioxia predecessor Toshiba, invented flash memory, [7] [8] and in 1984, Masuoka and his colleagues presented their invention of NOR flash. [9]

In January 2014, the Toshiba Corporation completed its acquisition of OCZ Storage Solutions, renaming it OCZ and making it a brand of Toshiba. [10]

On June 1, 2018, due to heavy losses experienced by the bankruptcy of the Westinghouse 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. [2] [11] 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, Kioxia 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. [12] [13]

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 to Kioxia Holdings Corporation and Toshiba Memory Corporation was renamed to Kioxia Corporation. [2] This renaming also included companies associated with Toshiba's solid-state drive brand OCZ. [14]

On August 30, 2019, Toshiba Memory Holdings Corporation, not yet renamed to Kioxia, 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]

Corporate governance

As of April 30, 2021, Kioxia ownership is as follows: [17]


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. [11]

Related Research Articles

Computer memory Device used on a computer for storing data

In computing, memory is a device or system that is used to store information for immediate use in a computer or related computer hardware and digital electronic devices. The term memory is often synonymous with the term primary storage or main memory. An archaic synonym for memory is store.

Flash memory Electronic non-volatile computer storage device

Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. NOR and NAND flash use the same cell design, consisting of floating gate MOSFETs. They differ at the circuit level depending on whether the state of the bit line or word lines is pulled high or low. In NAND flash, the relationship between the bit line and the word lines resembles a NAND gate; in NOR flash, it resembles a NOR gate.

Toshiba Japanese electronics conglomerate

Toshiba Corporation is a Japanese multinational conglomerate headquartered in Minato, Tokyo. Its diversified products and services include power, industrial and social infrastructure systems, elevators and escalators, electronic components, semiconductors, hard disk drives (HDD), printers, batteries, lighting, as well as IT solutions such as quantum cryptography. It was one of the biggest manufacturers of personal computers, consumer electronics, home appliances, and medical equipment. As a semiconductor company and the inventor of flash memory, Toshiba had been one of the top 10 in the chip industry until its flash memory unit was spun off as Toshiba Memory, later Kioxia, in the late 2010s.

Memory card Small, thin and removable digital data storage device, often designed to be semi-permanently installed inside a larger device

A memory card or memory cartridge is an electronic data storage device used for storing digital information, typically using flash memory. These are commonly used in portable electronic devices, such as digital cameras, mobile phones, laptop computers, tablets, PDAs, portable media players, video game consoles, synthesizers, electronic keyboards and digital pianos, and allow adding memory to such devices without compromising ergonomy, as the card is usually contained within the device rather than protruding like USB flash drives.

Western Digital American digital storage company

Western Digital Corporation is an American computer hard disk drive manufacturer and data storage company, headquartered in San Jose, California. It designs, manufactures and sells data technology products, including storage devices, data center systems and cloud storage services.

Micron Technology American company producing semiconductor devices

Micron Technology, Inc. is an American producer of computer memory and computer data storage including dynamic random-access memory, flash memory, and USB flash drives. It is headquartered in Boise, Idaho. Its consumer products are marketed under the brands Crucial and Ballistix. Micron and Intel together created IM Flash Technologies, which produces NAND flash memory. It owned Lexar between 2006 and 2017.

SanDisk Brand of flash memory products of Western Digital

SanDisk is Western Digital's brand for flash memory products, including memory cards and readers, USB flash drives, and solid-state drives. The company was acquired by Western Digital in 2016.


Lite-On is a Taiwanese Company that primarily manufactures consumer electronics, including LEDs, semiconductors, computer chassis, monitors, motherboards, optical disc drives, and other electronic components. The Lite-On group also consists of some non-electronic companies like a finance arm and a cultural company.

Plextor is a Taiwanese brand, best known for solid-state drives and optical disc drives.

Lexar American brand of flash memory products

Lexar Media, Inc. is an American brand of flash memory products manufactured by the Chinese company Longsys.

OCZ was a brand of Toshiba that was used for some of its solid-state drives (SSDs) before they were rebranded with Toshiba. OCZ Storage Solutions was a manufacturer of SSDs based in San Jose, California, USA and was the new company formed after the sale of OCZ Technology Group's SSD assets to Toshiba Corporation. Since entering the memory market as OCZ Technology in 2002, the company has targeted its products primarily at the computer hardware enthusiast market, producing performance DDR RAM, video cards, USB drives, power supplies, and various cooling products. SSD devices with the OCZ brand that are using SATA III, PCI Express, Serial attached SCSI and USB 3.0 interfaces, for both client and enterprise applications are currently being produced. OCZ Storage Solutions was dissolved on April 1, 2016 and absorbed into Toshiba America Electronic Components, Inc, which later then became Kioxia.

Solid-state drive Data storage device that uses no moving parts

A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit assemblies to store data persistently, typically using flash memory, and functioning as secondary storage in the hierarchy of computer storage. It is also sometimes called a solid-state device or a solid-state disk, even though SSDs lack the physical spinning disks and movable read–write heads used in hard disk drives (HDDs) and floppy disks.

Multi-level cell Memory cell capable of storing more than a single bit of information

In electronics, a multi-level cell (MLC) is a memory cell capable of storing more than a single bit of information, compared to a single-level cell (SLC), which can store only one bit per memory cell. A memory cell typically consists of a single floating-gate MOSFET, thus multi-level cells reduce the number of MOSFETs required to store the same amount of data as single-level cells.

Universal Flash Storage (UFS) is a flash storage specification for digital cameras, mobile phones and consumer electronic devices. It was designed to bring higher data transfer speed and increased reliability to flash memory storage, while reducing market confusion and removing the need for different adapters for different types of cards. The standard encompasses both packages permanently attached within a device (eUFS), and removable UFS memory cards.

Fujio Masuoka is a Japanese engineer, who has worked for Toshiba and Tohoku University, and is currently chief technical officer (CTO) of Unisantis Electronics. He is best known as the inventor of flash memory, including the development of both the NOR flash and NAND flash types in the 1980s. He also invented the first gate-all-around (GAA) MOSFET (GAAFET) transistor, an early non-planar 3D transistor, in 1988.

Memory cell (computing) Part of computer memory

The memory cell is the fundamental building block of computer memory. The memory cell is an electronic circuit that stores one bit of binary information and it must be set to store a logic 1 and reset to store a logic 0. Its value is maintained/stored until it is changed by the set/reset process. The value in the memory cell can be accessed by reading it.


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  8. Semiconductor memory device and method for manufacturing the same
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