Takashi Kotegawa, widely known by his forum pseudonym BNF or "J-Com Man," is a legendary Japanese day trader who turned roughly $13,000 into over $153 million in about eight years during the early 2000s. Operating from his bedroom, he specialized in high-speed, short-term, contrarian trading on the Tokyo Stock Exchange.
Takashi Kotegawa, also known as BNF, is a legendary Japanese day trader who famously turned an initial capital of around $13,600 into an astounding $153 million in approximately eight years.
He seems to have shifted his focus on the slower real estate market (a rumor is due to spend more times with his wife and families).
In the early days, Takashi would do what many stock traders did. He would use a scanner to look for the biggest movers on the day. But he often found that he was too late to the move, so instead, he created a list of 50 stocks that had good price movements in the past.
Takashi Kotegawa aka Japanese BNF Day Trader Who Turned $13,600 Into $153 Million. Takashi Kotegawa (aka BNF/J-Com man) is one of Japan's most famous day traders. He's also one of the most famous traders in the business.
During the market crash in 2008, while panic dominated the markets, Kotegawa remained calm — buying when others were selling. Those bold and calculated moves multiplied his fortune. 💼 Result: In less than 8 years, his portfolio exploded to over $153 million — all made by himself.
As of late 2025 and early 2026, Tadashi Yanai, founder of the Uniqlo clothing empire (Fast Retailing), consistently holds the title as Japan's richest person, though Masayoshi Son (SoftBank) has recently challenged for the top spot, with fortunes fluctuating based on market performance, especially in AI. Yanai's wealth comes from global Uniqlo sales, while Son's stems from tech investments through SoftBank.
T.
The Japanese company J-Com Holdings had just had its IPO and Takashi Kotegawa was glued to the barricade of monitors in his bedroom all day. That's how he noticed that a trader at the big firm Mizuho Securities had placed a sell order for 610,000 J-Com Holdings shares at 1 yen.
The 3-5-7 rule in trading is a risk management guideline: risk no more than 3% of capital on one trade, keep total risk across all trades under 5%, and aim for winning trades to be at least 7% larger than losing trades (or a 7:1 ratio) to ensure profits outweigh losses and protect capital. It promotes discipline, reduces emotional trading, and balances potential high rewards with controlled risk, making it great for beginners.
Bedroom trader Takashi have invested his fortune that he made out of trading into real estates and long term investments and it's officially billionaire now.
The "24-year-old trader making $8 million" refers primarily to Jack Kellogg, a successful day trader who reported over $8 million in gains from trading in 2020 and 2021, starting with just $7,500 and leveraging key indicators like VWAP, support/resistance, volume, and linear regression for simple, adaptable strategies. His story highlights achieving significant returns by weathering different market conditions, learning from losses, and sticking to core principles rather than overcomplicating things.
7 Strategies for Investing $1,000 and Making $5000
The "90-90-90 rule" in trading is a harsh reality check stating that 90% of new traders lose 90% of their money within the first 90 days, highlighting the high failure rate due to emotional decisions, poor risk management, and lack of education/strategy. It serves as a cautionary tale, emphasizing that success requires discipline, a solid trading plan, continuous learning, and strict risk control (like risking only 1-2% per trade) to avoid the common pitfalls that wipe out most beginners.
The 7-3-2 rule is a financial strategy for wealth building, suggesting it takes 7 years to save your first major financial goal (like a crore), then accelerating to achieve the next goal in 3 years, and the third goal in just 2 years, leveraging compounding and disciplined, increased investments (like a 10% annual SIP hike). It highlights how returns compound faster over time, drastically reducing the time needed for subsequent wealth targets, emphasizing patience and consistent, growing contributions.
A ¥400,000 monthly salary (around ¥4.8 million annually) is a decent, livable wage in Japan, especially for a single person in smaller cities, allowing for some savings; however, in expensive Tokyo, it's comfortable but requires careful budgeting, especially for families, as rent and living costs are higher. It's above the national average for younger workers and below the median in major cities, making it a solid foundation but not luxurious, with higher incomes needed for family comfort in expensive areas.
Yoshiko Shinohara became Japan's first self-made female billionaire in early 2017.