Bain Capital Fully Exits Kioxia: How SK Hynix and Toshiba Now Split Ownership

How Bain Capital Staged Its Exit

Bain’s departure from Kioxia was a methodical, multi-tranche sell-down over roughly eight months, beginning after the company’s December 2024 IPO :

• November 2025 — Bain’s special-purpose vehicle BCPE Pangea Cayman LP sold 36 million shares in a $2.1–2.3 billion block trade to overseas investors at ¥9,000 per share . This was the first major reduction.
• February 2026 — Bain cut its stake further to roughly 37% after a ~¥550 billion share sale. It also set up a forward sale with Goldman Sachs International tied to 25 million shares .
• By late March 2026 — Bain-related entities held 27.69% of Kioxia, down from 29.13% in the previous filing .
• July 8, 2026 — Bain sold its remaining shares, completing the full exit. The broader Bain-led consortium (which includes SK Hynix and other investors) still collectively retained about 18% of Kioxia, meaning some consortium profits remain unrealized .

Post-Exit Ownership: Toshiba and SK Hynix

After Bain’s full exit, Kioxia’s shareholder structure shifted significantly. Here are the latest reported stakes:

Critical Caveats

• SK Hynix’s stake is not yet active voting equity. Because the convertible bonds have not been converted, SK Hynix is technically the “de facto” second-largest shareholder but does not currently exercise voting rights. The Japanese government has expressed concern over a South Korean rival holding influence in a critical domestic chipmaker .
• Toshiba has continued selling its shares over time, bringing its stake down from the 40.2% it held in the original 2018 consortium to the current ~15% .
• The broader Bain-led consortium collectively retained about 18% of Kioxia even after Bain itself fully exited, meaning that some of the consortium’s profits from the investment are still unrealized .

Why This Deal Matters

Bain’s full exit marks the end of the most famous private-equity deal in Japanese corporate history. The 2018 acquisition of Toshiba’s memory business was born out of Toshiba’s financial crisis following its Westinghouse nuclear unit’s bankruptcy. Bain led a consortium that included SK Hynix, Hoya, and other investors to pay $18 billion for the business .

Kioxia’s stock surged more than 4,500% from its IPO price, driven by AI-related demand for NAND flash storage, giving Bain one of the largest returns on a technology buyout ever recorded . With Bain’s exit, the future of Kioxia’s ownership now hinges on whether SK Hynix can convert its bonds into common shares—and whether Japan’s regulators will allow a South Korean competitor to hold voting power in the country’s only memory chipmaker.