Jonathan Wellum: The Biggest Mistake Investors Make With Winning Stocks

Jonathan Wellum of ROCKLINC Investment Partners discusses sell discipline, emphasizing that investors should default to holding quality winners forever unless the fundamentals deteriorate, the stock becomes significantly overvalued, or a clearly better opportunity emerges. He advises trimming rather than exiting fully, ignoring tax bias, and maintaining patience, while cautioning against chasing trendy or poorly understood areas like AI. - Default to owning high-quality businesses forever unless the investment thesis breaks. - Sell only when fundamentals permanently worsen, the stock is overvalued, or a superior opportunity appears. - Trimming positions is effective; avoid binary sell decisions. - Taxes should not drive investment decisions; irrational holding hurts returns. - Patience and deep company knowledge reduce risk and improve concentration. - Value each stock on its own intrinsic merit, not on overall market levels. - Caution against high-beta, uncertain themes like AI when familiar compounders exist.