Nikkei hits 63K as Kioxia tops Hitachi

Japan’s stock market just gave a very clear answer to a simple question: what kind of bull market is this? Right now, it’s a chip market. The Nikkei 225 jumped to a fresh record above 62,000 when trading resumed on May 7, 2026, and one of the clearest symbols of that move was Kioxia overtaking Hitachi in market value. (msn.com) ### Why is Kioxia the name everyone noticed? Kioxia is a memory-chip company — basically a big bet on NAND flash, the storage used in data centers, phones, PCs, and increasingly AI infrastructure. It only listed in December 2024, but by late April it had already broken into Japan’s top 10 by market cap, rising from 43rd place at the end of 2025 to about ¥19.3 trillion. By May 7, market trackers showed it near ¥19.9 trillion. (bloomberg.com) ### Why does passing Hitachi feel like a big deal? Because Hitachi is not some random laggard. It’s one of Japan’s old industrial champions — rail, power systems, digital infrastructure, factories, the whole conglomerate playbook. Market-cap trackers on May 7 put Hitachi around $137 billion and Kioxia aro(bloomberg.com)tors are rewarding. (companiesmarketcap.com) ### So what is actually driving Kioxia? The short version is memory prices and AI demand. Kioxia is the world’s third-largest NAND maker by shipment share, and investors have been chasing companies tied to the hardware build-out behind AI. Bloomberg’s snapshot in late April tied Kioxia’s climb directly to stronger NAND pricing, and equity data show the stock up(companiesmarketcap.com)t is a mania-level move. (morningstar.com) ### Why did the Nikkei jump at the same time? The market-wide move had a few ingredients. Reuters tied the May 7 rally to strong technology earnings globally and fresh optimism around the Middle East after Japan’s holiday break. But the catch is that the index move and the Kioxia move reinforce each other — when global investors want AI exposure in Japan, they are reaching first for semiconductor names. (msn.com) ### Is this really about Japan Inc., or just a few stocks? More the second one. That’s the important nuance. Headline index records can make a market look broad and healthy, but this move has a very obvious leadership cluster — semiconductors, AI-adjacent hardware, and a handful of momentum names. Kioxia’s leap over Hitachi works as a symbol because it shows tech exposure beating diversified industrial stability. (msn.com) ### Does Kioxia’s business justify all of this? Investors clearly think near-term earnings power can explode if NAND pricing stays firm. Kioxia itself is due to report FY2025 results on May 15, 2026, so the next real test is whether management can show that AI-linked demand is translating into durabl(msn.com)own. (kioxia-holdings.com) ### Why does this matter beyond one stock? Because it says something bigger about Japan’s market leadership. For years, the story was governance reform, buybacks, and a slow return of foreign money. That story is still there, but Kioxia passing Hitachi suggests the market’s center of gravity has shifted toward semiconductor torque. Basically, Japan’s rally is no longer just “Japan is back.” It’s “Japan has a chip trade.” (bloomberg.com) ### Bottom line? Kioxia overtaking Hitachi is not just a leaderboard curiosity. It’s a sign that investors are paying up for AI memory exposure far more aggressively than for classic industrial scale. If that continues, the Nikkei can keep making headlines. But if memory prices wobble, the same concentration that pushed the market higher can snap back just as fast. (stockanalysis.com)