Using descriptive-correlation analysis, this study aimed to determine the effects of fear-ofmissing-out (FOMO) behavior in the students' post-purchase experiences regarding postpurchase satisfaction and regret. The respondents were randomly selected from 203 Senior High School students in Divine Word College of San Jose. The data were gathered using a modifiedadapted survey questionnaire and tabulated using descriptive statistics, Pearson Correlation Coefficient (r), and Regression Analysis to assess the students' perceived level of FOMO behavior and post-purchase experience in terms of various sub-indicators and the relationship between and among the variables. The findings of this study revealed that FOMO behavior significantly influences the students' purchasing decisions, affecting their post-purchase experiences. Moreover, this study observed higher post-purchase satisfaction than regret when taken alone. However, upon closer look, the study revealed that the relationship between the students' FOMO behavior and post-purchase satisfaction is less significant compared to its association with post-purchase regret, highlighting the importance of perceived opportunity costs in shaping students' post-purchase experiences with their purchasing decisions.Nevertheless, the findings showed that the students experienced regret mainly due to foregone