I just re-read the story of Takashi Kotegawa and honestly it still impacts me. This guy is probably one of the most legendary retail traders that has ever existed, but almost no one knows him outside Japan.

What’s interesting about Kotegawa is not just that he made money—that many have done. The fascinating part is how he did it being completely self-taught, without institutional backing, without formal mentors. He was born in 1978 into an ordinary family, graduated from university, and simply decided to learn trading by watching charts, analyzing patterns, studying fundamentals. While others looked for courses or credentials, he was in the charts.

The moment that catapulted him was the Livedoor scandal in 2005. When panic hit the Japanese stock market and most investors panicked, Takashi Kotegawa saw opportunity. While others fled, he attacked. It’s reported that he made over 2 billion yen in just a few years. That’s roughly 20 million dollars at that time. No joke.

But what truly made him legendary was the J-Com trade in 2005. A trader from Mizuho Securities made a monumental mistake—placed a sell order for 610,000 shares at 1 yen instead of 1 share at 610,000 yen. A difference of brutal magnitude. Kotegawa recognized the anomaly in seconds, bought massively at that ridiculous price, and when the error was corrected, the profits were enormous. That’s not luck, that’s mental speed combined with discipline.

What surprises me most about Takashi Kotegawa is his life afterward. With all that wealth, he still uses public transportation, eats at cheap restaurants, almost never gives interviews. He avoids appearing in media, doesn’t want to be recognized on the street. In a world where successful traders are influencers, he chose the opposite. That says a lot about his mindset.

His legacy is simple but powerful: it shows that in markets, skill, discipline, and the right timing can beat any institution. Takashi Kotegawa is proof that a determined retail trader can shake up the market.