This study aims at connecting the behavioral corporate finance (micro level) perspective and complexity theory along with agent-based modelling in order to analyze the impact of selected behavioral managerial factors on aggregated data related to the financial market stability (macro level). Specifically, we want to explore whether subjective well-being (SWB) of corporate managers (CEOs) impacted their business decisions during the Covid-19 pandemic, and how it may be related to volatility of stock prices and the issue of financial stability during this critical period. Our study is based on a survey of 255 managers of companies listed on the Warsaw Stock Exchange in Poland over the period …. Using the results of this survey, we build an agent-based model (ABM) calibrated for the specific case of Poland to investigate how decision making of CEOs, stemming from their SWB, influence the stock prices and selected financial market dynamics indicators. The results of our study indicate that the excess volatility of stock prices may be a function of changes of SWB of managers, which in turn could lead to some crashes on the macro level with respect to financial stability.