Abstract :
Students tend to be overconfident when running a business. The so-called overconfidence bias is characterized by excessive self-confidence over other individuals. Several studies correlate such a phenomenon to the big five personality types. This study attempts to investigate the influence of big five personalities on overconfidence bias, especially in college students, using a quantitative correlational approach with an accidental sampling technique. The subjects were 383 student entrepreneurs aged 18 - 22 years. The instruments used were IPIP-BFM-50 and the overconfidence bias scale. The multiple linear regression analysis test indicated a significant positive effect of personality types (agreeableness, conscientiousness, intellect) on overconfidence bias in student entrepreneurs. Emotional stability negatively affected overconfidence bias in student entrepreneurs, while extraversion did not affect overconfidence bias in student entrepreneurs. The overall influence of the personality types on overconfidence bias was 22.4%. The implications of research on extraversion type student entrepreneurs, being able to sort out the information received. The agreeableness type does not easily believe in pseudo-information, the conscientiousness type does not feel better than other people, the intellect type can control curiosity in taking risks, and the emotional stability type with low neuroticism is able to control emotional stability so as not to tend to be overly confident.