This study investigated the impact of growing psychological biases on investment satisfaction. Three psychological biases are examined: overconfidence, disposition effect, and representative. The effect of these behavioral characteristics on investment satisfaction was analyzed using financial knowledge as a moderator. This study investigated four econometric equations to describe the moderator function of financial knowledge. The interaction impact was examined using regression with a moderating variable. The analysis results indicated that overconfidence and representational bias significantly influenced investment satisfaction. Meanwhile, the disposition effect had a non-significant positive effect. Financial knowledge literacy cannot minimize these psychological biases, but it can operate as a moderating variable, as indicated by the interaction model (homologiser moderation).