Millennials and Generation Z in Batam City play a significant role in the local economic dynamics, particularly in investment activities. This study aims to analyze the influence of investment experience, financial behavior, and risk tolerance on investment decisions among Millennials and Gen Z. The study highlights the importance of financial literacy and experience in shaping rational investment behavior among young investors in urban economic settings. A quantitative approach was employed, utilizing Partial Least Squares-Structural Equation Modeling (PLS-SEM) with SmartPLS software for data analysis. Data were collected through an online survey using purposive sampling, involving 204 respondents residing in Batam who are actively investing in the stock market. The results indicate that investment experience significantly influences both investment decisions and risk tolerance. Similarly, financial behavior shows a significant effect on both variables. Furthermore, risk tolerance has a significant impact on investment decisions. These findings suggest that the higher the investment experience and the better the financial behavior, the greater the individual’s risk tolerance, which in turn affects their investment decisions.