Japan's stock market, made simple.

What We Do

Japan Stock Alpha is an independent research site dedicated to making the Japanese equity market accessible to everyone. We break down what's moving Japan's market — trading houses, semiconductors, defense, monetary policy — in language anyone can follow. No jargon, no fluff.

Why Japan?

Japan is home to some of the world's most compelling investment stories. From Warren Buffett's bets on the five major trading houses to the chip equipment makers powering the global AI buildout, the Tokyo Stock Exchange is undergoing a historic transformation. Corporate governance reforms, record shareholder returns, and structural shifts are changing how these companies operate — yet coverage in English remains thin.

We exist to fill that gap.

What You'll Find Here

Our research covers the key themes driving Japanese equities:

• Berkshire & Trading Houses — Deep dives into the sōgō shōsha that Buffett backed: Mitsubishi, Mitsui, Itochu, Marubeni, and Sumitomo.
• Semiconductors & AI — The Japanese equipment makers, memory suppliers, and materials companies behind every leading-edge fab.
• Defense — Japan's historic shift to 2% GDP defense spending and the contractors building next-generation capabilities.
• Rare Earths — The Minamitorishima deep-sea deposit and the companies positioned around it.
• Macro — Nikkei vs. S&P 500 performance, USD/JPY trends, and valuation comparisons.

Every article includes data, charts, and — where relevant — downloadable valuation models.

Who We Are

Japan Stock Alpha is an independent publication. We are not affiliated with any brokerage, fund, or financial institution. Our content is for educational and informational purposes only — nothing on this site constitutes investment advice.

Get in Touch

Questions, feedback, or collaboration ideas? Reach us at contact@japanstockalpha.com or through our Contact page. You can also find us on X (@japanstockalpha).