This paper examines the effect of shadow banking activities on the performance and risk-taking of 339 Vietnamese nonfinancial firms listed on the Ho Chi Minh Stock Exchange (HOSE). Using manually gathered data on firms' shadow banking activities from 2009 to 2021, the expansion of shadow banking is found to have a negative effect on the overall financial soundness of the securities companies, in particular negatively affecting performance and increasing the risk tolerance of companies. We present empirical findings about several aspects of shadow banking activities, including entrusted loans, entrusted investments, private lending, leasing, and commercial credit in this study. While the majority of shadow banking operations could have a negative impact on a firm's performance, we have discovered that commercial credit grants were crucial in reducing the COVID-19 pandemic's adverse effects on businesses, highlighting the need for financial stability in times of crisis. According to our results, the risk of shadow banking activities, which have consequences for policymakers and caution for nonfinancial enterprises, must be taken into consideration.