Toshiba Memory Corporation (東芝メモリ株式会社) was established April 1, 2017, when Toshiba Corporation spun off its memory business (kioxia.com company profile). It was renamed Kioxia Corporation on October 1, 2019, and now sits under holding company Kioxia Holdings Corporation (Tokyo Stock Exchange Prime: 285A), headquartered at 3-1-21 Shibaura, Minato-ku, Tokyo. A Bain Capital-led consortium bought the business from Toshiba in 2018 for roughly $18 billion; Toshiba retained about 32% after Kioxia's December 2024 IPO (Reuters/Nikkei, WSJ). Kioxia reports ~15,000 consolidated employees and FY2025 (ended March 2026) revenue of ¥2,337.6 billion (kioxia-holdings.com, "KIOXIA at a Glance").
Operations. Kioxia develops and manufactures NAND flash memory — a technology it invented in 1987 — including BiCS FLASH 3D flash memory, client and enterprise/data-center SSDs, embedded memory (eMMC/UFS) for smartphones, automotive and industrial applications, and retail SD cards and USB drives. Wafer manufacturing runs through fabs in Yokkaichi and Kitakami, Japan, largely via a joint venture with SanDisk/Western Digital (Flash Ventures); it is among the world's largest NAND suppliers (Morningstar; Kioxia Integrated Report 2025).
Litigation posture. The three tracked matters all date from 2017 and reflect an operating company in a two-way dispute with a competitor, not NPE-style assertion: two plaintiff-side PTAB proceedings and one ITC Section 337 investigation as respondent. Nothing clusters in plaintiff-friendly district venues such as the Eastern District of Texas.
Notable cases. Macronix International filed ITC Inv. No. 337-TA-1046 on March 7, 2017, alleging Toshiba's non-volatile memory products infringed U.S. Patents 6,552,360, 6,788,602 and 8,035,417; Toshiba Memory was later added as a respondent (82 FR 17687–88; ITC notice). Toshiba countered with IPR petitions against Macronix patents in June and July 2017. The ALJ issued a final initial determination of no violation in April 2018, and the parties settled in October 2018 with cross-licenses; the ITC rescinded its remedial orders in November 2018.