Kioxia 600 Employees Become “1 Billion Yen Rich” via AI-Driven Stock Options — 2026 Update

---

Kioxia AI Memory Demand and Stock Surge Background

Kioxia, spun off from Toshiba’s memory business, specializes in NAND flash memory. Surging demand for AI data centers has driven significant stock price increases in 2026. According to Nikkei reporting, AI chip demand boosted sales, pushing the stock price higher year-to-date. Independent coverage from Sedaily confirms the same AI boom impact.

📑Table of Contents

1. Kioxia AI Memory Demand and Stock Surge Background
2. Details of the “1 Billion Yen Rich” Assets Held by 600 Employees and Calculation Basis
3. AI Boom Driving Structural Changes in the NAND Flash Industry
4. Differences Between Unrealized Valuation Gains and Realized Gains, Tax and Risk Considerations
5. Kioxia’s History and Evolution from Toshiba’s Memory Business
6. Frequently Asked Questions (FAQ)

Specifically, demand for NAND flash used in AI servers and data centers has grown substantially year-over-year. Kioxia is expanding production capacity, but supply shortages persist, supporting the stock price.

---

Details of the “1 Billion Yen Rich” Assets Held by 600 Employees and Calculation Basis

Approximately 600 Kioxia employees now hold assets exceeding 1 billion yen each due to the AI-driven stock surge. Sedaily reports that roughly 7 million shares in stock options were granted. At the 2026 high of 112,700 yen per share, the total valuation reaches approximately 790 billion yen, with unrealized gains estimated at 778 billion yen.

These are unrealized valuation gains, not yet cashed out. Stock option details are based on public information, but individual holdings are often not disclosed. Nikkei also reported on the 600 “billionaires.”

Item	Value	Notes
Employees affected	~600	Assets over 1B yen via AI stock options
Shares granted	~7 million	Total stock options
Peak share price	112,700 yen	2026 high
Total valuation	~790 billion yen	Peak value basis
Unrealized gain	~778 billion yen	Not realized

Source: Sedaily (2026-06-28), Nikkei (2026-06-27)

---

AI Boom Driving Structural Changes in the NAND Flash Industry

The AI boom has exploded demand for data center storage. NAND flash is essential, prompting industry-wide production expansion. However, long lead times for capital investment create short-term supply constraints that support higher prices.

---

Differences Between Unrealized Valuation Gains and Realized Gains, Tax and Risk Considerations

Unrealized gains can disappear if stock prices fall. Taxation in Japan applies only upon sale as capital gains tax. Risks include market volatility and company performance deterioration.

---

Kioxia’s History and Evolution from Toshiba’s Memory Business

Kioxia was separated from Toshiba in 2017 and renamed in 2019. It inherits Toshiba’s technology and competes globally in NAND flash. The AI boom accelerates its growth.

---

Frequently Asked Questions (FAQ)

Q: What does “10億り人” specifically mean?

It refers to employees whose asset valuation exceeds 1 billion yen, primarily from unrealized stock option gains.

Q: Are the assets realized or unrealized valuation gains?

They are unrealized. No sales have occurred, so they are subject to stock price fluctuations.

Q: Are there similar cases at other semiconductor companies?

Similar cases have been reported elsewhere, but Kioxia’s scale is tied directly to AI demand.

Q: What is the outlook for continued AI demand?

AI data center expansion is expected to continue, supporting steady NAND flash demand, though increased competition is possible.

Q: Are details of employee stock options publicly disclosed?

Aggregate numbers and valuations come from reports, but individual employee holdings are often non-public.

Related articles:

• Boltz Bio Releases BoltzMol-1 and BoltzProt-1 for Drug Discovery
• MiniMax M3 Brings Open-Weight Frontier AI with 1M Context
• Arbor: Hypothesis-Tree AI Optimization Framework Beats Claude Code & Codex by 2.5x [2026]