The goal of this paper is to explore and compare the specific behaviors of investment funds through data analysis to uncover patterns relevant to answering the research question of whether the trends and asset structures of the investment fund markets are resilient to unexpected external disruptions. The focus of the theoretical segment is placed on that part of industrial organization which is directly applicable to the analysis of investment fund behaviors, ensuring that the paper provides insights related to theoretical frameworks. Thus, the second chapter chooses to also discuss non-price strategies as a form of strategic behavior of companies, given that vertical relationships, vertical integrations, product differentiation, and non-price strategies such as advertising, market concentration, and barriers to market entry affect the choice of behavior, especially considering potential reactions from others. This is crucial here, as in the search for the aforementioned question, periods relating to the circumstances of COVID and Brexit were analyzed, hence the overall behavior of the funds could lead to a market downturn or recovery as a whole. The paper is structured to be accessible to readers of various academic backgrounds and prior knowledge. The introduction outlines this approach, and the paper then elaborates on theoretical foundations before focusing on data analysis and comparison, using real examples from selected countries. The author, coming from a legal profession, acknowledges that transitioning to economic aspects poses a challenge outside of his comfort zone, but this has not diminished his dedication to the work, and additional effort was made to ensure the paper is understandable and concrete, as confirmed by the use of three textbooks that provide a thorough literature review and give a theoretical basis for the conducted economic analysis, which is crucial to the paper. The analysis showed that some countries are more resilient and stable, but alo that those which were visibly affected by the mentioned circumstances have shown signs of recovery and stabilization, which proves resilience and adaptability.