Investment decision-making is an essential aspect of individual financial management that is influenced by various psychological and behavioral factors. As Generation Z's participation in investment activities continues to increase, understanding the factors that influence investment decisions has become increasingly important. Based on the Theory of Planned Behavior, risk tolerance, overconfidence, and herding behavior are considered factors that may influence investment decisions. This study aims to examine the effects of risk tolerance, overconfidence, and herding behavior on the investment decisions of Generation Z in Jakarta. This research employed a quantitative approach with a causal research design. Primary data were collected through questionnaires distributed to Generation Z individuals in Jakarta who had investment experience. The study population consisted of 2,584,464 individuals, while a sample of 140 respondents was selected using proportional random sampling based on the purposive sampling Data were analyzed using multiple linear regression with SPSS version 26. The results indicate that risk tolerance and overconfidence have a positive and significant effect on investment decisions, whereas herding behavior has no significant effect on investment decisions.
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