Private company
Who owns Flash Partners Ltd.
One company in the researched set discloses a stake in Flash Partners Ltd., worth $25m between them. Flash Partners Ltd. is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Flash Partners Ltd. - Profile
- Type
- joint venture
- Based in
- Japan
- Founded
- 2004
Flash Partners is the oldest of the three surviving Japanese manufacturing ventures, collectively called Flash Ventures, through which Sandisk and Kioxia (formerly Toshiba's memory business) build NAND flash memory together. It was formed in September 2004 to equip Fab 3, a 300 millimetre wafer fabrication plant at the Yokkaichi site in Mie prefecture, and production there began in 2005. The venture buys and leases the semiconductor manufacturing equipment while Kioxia owns the buildings and runs the wafer manufacturing; the two partners co-develop the process technology and memory designs, jointly own the resulting technology, share the fixed costs and take their agreed share of the output at cost plus a small markup. The partners have repeatedly extended its life, most recently in January 2026 when its term was pushed from the end of 2029 to 31 December 2034 so that all three Flash Ventures entities expire together.
Source
Flash Partners Ltd. files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from SanDisk Corp Form 10-K for FY2006 (SEC), Sandisk Corp Form 10-K for FY2026 (SEC) and Toshiba And SanDisk Celebrate Construction Of 300mm Wafer Fab Building For NAND Flash Memory (Phys.org). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Sandisk Corporation, as of 3 Jul 2026. One of three Flash Ventures manufacturing joint ventures with Kioxia Corporation (Flash Partners Ltd., Flash Alliance Ltd., Flash Forward Ltd.), operating flash memory wafer fabs in Yokkaichi and Kitakami, Japan. Sandisk holds a 49.9% ownership position in EACH entity individually (stated explicitly in prose, not derived). The FY2026 10-K balance sheet note breaks out 'Investment in Flash Partners' as $25 million as of 3 Jul 2026 (versus $55 million as of 27 Jun 2025), separately from a $21 million notes-receivable balance to the same entity. This is an individually disclosed equity-method carrying value, not a combined bucket. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Flash Partners Ltd. where a holder stated one, and are missing where no holder did.