Background: Digitalization has made it easier for the retail investor to invest in the stock market. Behavioral finance is a theory that explains the behavioral biases that can make investors act irrationally. Fear of Missing Out (FoMO) is a phenomenon that has evolved with social media usage, individuals feel stressed to keep up to date with information and fear of being excluded in social settings. From this phenomenon, an investor-related term was coined as investor-related FoMO (I-FoMO). Studies that investigate underlying factors that can lead to indicated I-FoMO are limited. 

Purpose: The purpose of this thesis is to examine if I-FoMO among Swedish retail investors is affected by demographical and behavioral factors. The demographical factors that have been studied are gender, age, education, and marital status. The behavioral factors are overconfidence, extraversion, FoMO, and a positive social media approach. 

Method: This thesis is based on a deductive approach together with a quantitative research method. Through primary data collection via an online survey, a binary logistic model was performed in SPSS and STATA. The online survey was published on online forums between 2023-03-04 and 2023-03-11, in total 283 valid retail investors participated. 

Conclusion: Findings from the collected data showed that I-FoMO was indicated by Swedish retail investors. We found with statistical significance that older retail investors are more likely to indicate I-FoMO, retail investors without a university degree are more likely to indicate I-FoMO, overconfident retail investors are less likely to indicate I-FoMO and retail investors with a positive social media approach are more likely to indicate I-FoMO. Furthermore, findings indicated that FoMO and I-FoMO are two different concepts.