Often, risky decisions have to be made under stress. Since risk-taking can have far-reaching consequences, it is important to understand the influence of stress on risk-taking behavior. To get a better understanding of this topic, this study (N=40, 50% female) examined behavior in the Balloon Analogue Risk Task (BART) and its underlying processes under social stress induced by the Public Speaking Task. For that, a mixed design with the within-subject factor ‘time’ (pre vs. post measurement of the BART) and the between-subject factor ‘experimental group’ (control vs. experimental group) was used. In addition, we modeled the cognitive processes underlying behavior in the BART using the Bayesian Sequential Risk Model (BSR). Based on previous findings, we hypothesized that individuals under stress would show more risk-taking behavior and that this effect would be more pronounced in men than in women. We expected effects of the stress manipulation on the reward sensitivity and the choice consistency parameters of the model. Due to subjective ratings, the stress manipulation was effective as participants in the experimental condition reported a higher stress level after the stress induction. Unexpectedly, there were no differences in risk taking with and without the stressor or between genders, and also no differences in the postulated BSR parameters. However, the BSR learning parameter was reduced from the first to the second measurement of the BART only in the control group. This finding implicates that stress influences the learning during the BART. Thus, the learning process within the BART should be further examined.