Bank bailouts are systemic in China, having been extended to nearly all distressed banks, including those with no systemic importance. This paper investigates the consequences of regulators seizing control of Baoshang Bank, the country’s first bank failure in two decades. Despite the numerous liquidity and credit provision measures immediately implemented by bank regulators, we find that the collapse of this city-level commercial bank significantly exacerbated funding conditions in the market for negotiable certificates of deposit (NCD), resulting in liquidity distress for other banks. Our empirical analysis demonstrates that the spillover of Baoshang’s collapse is disproportionately concentrated in systemically unimportant (SU) banks, owing to diminished market confidence in government bailouts of SU banks, or implicit nonguarantee. We employ a difference-in-differences approach to show that the Baoshang event had a persistent and significant effect on SU banks’ NCD issuance, increasing credit spreads by 21.9 bps and the likelihood of issuance failure by 6.3%. Our empirical framework further enables us to examine the impact of China’s long-standing guarantee of SU banks, which we find impairs price efficiency, undermines market discipline, encourages excessive risk taking, and raises equity prices.