BNF (Takashi Kotegawa): How a Japanese Day Trader Broke Profitability Records

Who is this man who has made 20 million dollars?

Takashi Kotegawa, known in financial circles by the pseudonym "BNF", is probably the wildest story of retail trading in the 2000s. Born in 1978, he had no inheritance or financial network—just a computer and an obsession with stock charts.

The self-taught individual who surpassed Wall Street

Without a finance degree or institutional mentor, Kotegawa taught himself. He spent his days studying price action, decoding chart patterns, and analyzing company fundamentals. While MBAs followed their theoretical courses, he was building his market intuition live.

2005: The Year of Profitable Chaos

The key moment? The Livedoor crash. When the rest of the market panics and closes their positions, Kotegawa sees an opportunity. Result: over 2 billion yen gained in a few years. His weapon: a surgical execution on short-term movements in a boiling market.

The legendary trade: J-Com (2005)

A trader at Mizuho Securities makes the blunder of the century—places a reverse order: 610,000 shares at 1 yen instead of 1 share at 610,000 yen. For a few seconds, the shares trade at a dumping price. Kotegawa instantly strikes, accumulating the discounted shares, then sells them at the correct price once the error is corrected. Massive profit, impeccable risk management.

The Riddle of the Invisible Millionaire

Despite his 20+ million dollars, Kotegawa remains a ghost. Public transport, small restaurants, zero selfies on social media. He refuses interviews and hides his face—creating an even more alluring aura of mystery around him.

Why does his story disturb?

In a world where hedge funds and algorithms dominate, BNF proves that a lone guy with discipline, a steel psychology, and good timing can beat the institutions. It's the ultimate underdog narrative—and it inspires a generation of retail traders to believe that it is possible.

But be careful: many try, very few succeed. The difference? Kotegawa had the advantage of the chaotic market of the 2000s, a window of time that may never return.