Emerging
Jun 18, 2026 Major2
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Olympic Champion Mizutani Harutaka Faces Public Scrutiny Over Stock Trading Losses
Mizutani Harutaka, a Tokyo Olympic gold medalist and television personality, has garnered online attention for documenting his stock trading losses, including recent purchases of Kioxia, Furukawa Electric, and SoftBank Group shares that he quickly cut for losses despite subsequent price appreciation. His disclosed cumulative investment losses total approximately the cost of a Tokyo house plus a luxury Lexus LS sedan.
Quick Facts
Who
Mizutani Harutaka
What
Posted stock trading screenshots on X
When
June 15, 2026
Where
X (social media platform)
- Posted stock trading screenshots on X
- Purchased shares in Kioxia, Furukawa Electric, and SoftBank Group
- Cut losses after one-day market decline
- Disclosed investment loss history on YouTube
- Regularly shares stock and forex trading updates
Mizutani Harutaka, a table tennis champion and television talent who won gold in the Tokyo Olympic mixed doubles competition, has drawn widespread online attention for his stock trading activities and substantial investment losses. On June 15, Mizutani posted screenshots of his recent stock transactions on X (formerly Twitter), revealing purchases of shares in companies including Kioxia, Furukawa Electric, and SoftBank Group. Despite buying these stocks just days before significant market movements, Mizutani disclosed that he had already cut his losses and no longer held these positions, describing the experience as "a big crash the day I bought."
Mizutani's trading results have generated considerable commentary from internet users, who noted the apparent paradox of his investment approach. While the stocks he had purchased subsequently appreciated, his loss-cutting strategy meant he missed potential gains, prompting mixed reactions online ranging from criticism of his patience to admiration for his transparent documentation of market decisions. One particularly striking post displayed a loss figure of minus 10,375,669 yen.
Mizutani has become known for regularly sharing updates about his stock and forex trading activity. In a previous appearance on the YouTube channel 'New R25,' he disclosed the cumulative scale of his investment losses, stating that in 2024 he lost enough to afford a house in Tokyo. For 2025, he indicated losses equivalent to the price of a luxury Lexus LS sedan, bringing his total losses to what he described as covering both a house and a luxury vehicle.
The public documentation of his trading activities has made Mizutani something of an unintentional case study in retail investing behavior, with observers noting his substantial financial resources but questioning his investment discipline and conviction.
Why This Matters
Mizutani's public documentation of substantial trading losses offers a cautionary lesson for retail investors. His case illustrates how even financially resourced individuals can struggle with investment discipline, timing, and conviction—issues that resonate with millions of ordinary investors attempting to navigate stock markets. His transparent sharing of losses (totaling house-and-luxury-car equivalent sums) creates an unusual, real-world narrative about the costs of poor trading decisions, making it relevant for anyone evaluating their own investment strategy or considering whether to rely on emotional decision-making in volatile markets.
Timeline & Sources
Jan 1, 2024
WireMizutani incurred investment losses equivalent to the price of a Tokyo house
Jan 1, 2025
WireMizutani incurred investment losses equivalent to the price of a Lexus LS luxury sedan