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William O’Neil, the founder of Investor’s Business Daily, passed away recently. He was renowned for his influential stock trading philosophy, particularly his best-selling book, “How to Make Money in Stocks.” O’Neil’s methods combined both fundamental and technical analysis, reshaping how investors approached the market.
O’Neil’s concept of the “high-tight flag” pattern emerged from his observations on market behavior, where stocks that double in value exhibit a follow-up price increase. For instance, in 2024 alone, stocks like Nvidia (NVDA) and Palantir (PLTR) have doubled and continued to show remarkable growth in 2025. This pattern usually consists of a sharp price increase followed by a consolidation period, making it a critical tactic for investors.
Currently, two notable high-tight flag candidates include the iShares Ethereum ETF (ETHA), which surged from $18 to $37 in eight weeks, and Nebius Group (NBIS), which recently doubled its shares after securing a $17 billion contract with Microsoft (MSFT). This trend reflects historical patterns that O’Neil highlighted, emphasizing the significance of strong catalysts in stock performance.
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