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Bain Capital has sold its entire remaining stake in Kioxia Holdings, the Japanese NAND flash memory chipmaker, closing the books on an investment that started as a rescue mission and ended as one of the most profitable technology deals in the history of the asset class.
Bain is projected to realize over $15 billion in profits from its original position, with total returns approaching 20 times its initial capital.
How a distressed Toshiba division became a $75 billion business
The story starts in 2018, when Toshiba was in genuine financial trouble and needed to sell something valuable fast. Its memory chip division was the crown jewel, and Bain Capital led an $18 billion consortium to acquire it. That made the deal Asia’s largest leveraged buyout at the time, a title it held for years.
Bain committed to keeping operations in Japan, which helped smooth the political friction.
The renamed company, Kioxia, spent several years navigating exactly the kind of turbulence the skeptics predicted. A significant downturn in NAND memory prices hit the business hard, and there were real questions about when, or whether, a profitable exit would materialize.
Then the AI boom arrived and rewrote the entire thesis. High-performance storage requirements for AI training and inference created demand for NAND memory that the market had not fully anticipated. Kioxia, as one of the world’s major NAND producers, was sitting directly in the path of that tailwind.
The exit: three years, multiple block trades, and $5.6 billion in secondary sales
Kioxia completed its IPO on the Tokyo Stock Exchange in December 2024. At listing, Bain held approximately 51.3% of the company’s shares. The firm then spent the better part of eighteen months methodically selling down that position.
The first major move came in November 2025, when Bain sold approximately $2.1 billion worth of shares. Markets reacted predictably: Kioxia’s stock dropped about 14% following the announcement.
Bain returned in February 2026 with a second disposal, selling roughly 39 million shares worth approximately $3.5 billion. By March 2026, the firm’s ownership had been reduced to around 29%, and the total haul from secondary sales alone had reached roughly $5.6 billion.
Kioxia’s market valuation has climbed to approximately $75 billion, driven by AI-related demand for NAND flash memory. The stock reportedly increased more than ten times from its IPO price.
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