<![CDATA[Investment decisions are influenced not only by rational considerations but also by psychological factors and behavioral biases, as explained by Behavioral Finance Theory, Prospect Theory, and the Theory of Planned Behavior. This study examines the effects of regret aversion, mental accounting, illusion of control, and overconfidence on investment decisions among investors in Bengkulu City. A quantitative approach was employed using primary data collected through questionnaires. Of 395 distributed questionnaires, 358 met the research criteria and were valid for analysis. Data were analyzed using multiple linear regression with IBM SPSS Statistics version 27. The results show that regret aversion significantly affects investment decisions (t = 2.096; Sig. = 0.037), mental accounting significantly affects investment decisions (t = 5.711; Sig. = 0.000), and illusion of control significantly affects investment decisions (t = 6.754; Sig. = 0.000). In contrast, overconfidence has no significant effect (t = 0.543; Sig. = 0.587). These findings indicate that regret aversion, mental accounting, and illusion of control are important psychological factors in investment decision-making, while overconfidence does not significantly influence investment decisions. Practically, investors and capital market stakeholders, particularly the Indonesia Stock Exchange Representative Office in Bengkulu, should strengthen financial education and investor literacy programs addressing behavioral biases to support more informed and rational investment decisions.]]>
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