Deciding whether to lock in a 20% gain depends entirely on your original investment thesis, time horizon, tax bracket, and overall portfolio asset allocation strategy. While taking profits at a 20% threshold is a common risk-management rule for short-term traders, long-term investors often evaluate whether the underlying company's fundamental growth drivers remain intact before selling. To help tailor this strategy: What was your primary investment goal when buying this stock, and what is your overall portfolio risk tolerance?