As China’s shadow banking sector expands, the impact of listed companies’ involvement in financial stability and the real economy accumulates increasing attention. Despite being a crucial channel for non-financial firms to participate in shadow banking, the literature has given limited consideration to the acquisition of wealth management products (WMPs). Using data from Chinese listed firms between 2007 and 2020, we analyze how excessive equity financing affects companies’ WMP acquisitions. Our findings indicate that over-financing significantly boosts WMP purchases among these firms, particularly in cases of private ownership, raised environmental uncertainty, and strict financing constraints.