We examine the collusion effects of multiple large shareholders (MLS) on corporate ESG per-formance. Using a sample of Chinese listed firms for 2010-2020, we find that firms with MLS tend to have lower ESG performance than firms with a single large shareholder. This finding is robust to a series of robustness checks. Our conclusion is consistent with the common-benefit and cost -sharing hypothesis, where MLS shoulder the costs of poor ESG performance with the controlling shareholder and protect their common benefit through free-riding behavior.