Bain Capital Completes Full Exit from Kioxia
Bain Capital, the private‑equity firm that led the $18 billion acquisition of Toshiba Memory in 2018, has sold its entire stake in the Japanese flash‑memory chipmaker Kioxia, Managing Partner David Gross told Bloomberg TV on Wednesday. The firm previously held an ownership of more than 50 % when Kioxia listed on the Tokyo Stock Exchange in late‑2024, following a difficult restructuring and a failed merger attempt with U.S. memory maker Western Digital.
Kioxia’s valuation surged on artificial‑intelligence‑driven demand for memory, with its market capitalisation reaching a peak of 56 trillion yen (approximately $345 billion) in mid‑June 2026, briefly overtaking Toyota Motor as Japan’s most valuable company.
Bain’s divestment was staged over the past months. The first significant sale occurred in November 2025, when a Bain‑controlled unit disposed of over $2 billion worth of Kioxia shares to overseas investors. This was followed by a second tranche of more than $3.5 billion sold in February 2026. Gross confirmed that the firm is now “winding down… we don’t have a stake anymore.”
Beyond Bain, Toshiba remains the single largest shareholder in Kioxia, holding roughly 22 % of the company as of November 2025. Other participants in the 2018 buyout consortium included South Korean memory chipmaker SK Hynix, as well as technology firms Apple, Dell Technologies, Kingston Technology and Seagate Technology.
Key figures
- Total acquisition value in 2018: $18 billion.
- Bain’s ownership at IPO: >50 %.
- Market‑cap peak: 56 trillion yen ($345 billion) in mid‑June 2026.
- Sale amounts: >$2 billion (Nov 2025) and >$3.5 billion (Feb 2026).
- Toshiba’s stake: ~22 % (Nov 2025).
Implications
The complete exit by Bain marks the end of its involvement in Kioxia’s capital structure, while the company’s elevated market valuation underscores the strong demand for AI‑related memory products.