Individual investors' behavior is influenced by biases, like overconfidence, in their decision-making. A study analyzed 243 responses from Colombo Stock Exchange investors to see how socio-economic factors, trading knowledge, and self-reflection affect overconfidence. Results show that self-reflective males with higher education and more experience are more prone to overconfidence. Age, profession, and income don't impact overconfidence. The study suggests that financial advisors can use this information to better understand their clients and create tailored investment plans. This research is valuable for investors, advisors, and regulators in avoiding costly mistakes.