Earnings management occurs when managerial discretion allows managers to influence reported earnings and thus mislead some investors about the underlying economic performance and quality of the firm. This study considers how potential investors may guard against earnings management by observing negative stock price reaction at the lockup expiration period of IPO firms as a negative signal. Findings from a sample of 160 newly public firms show that earnings management behavior is stronger in IPO firms backed by venture capitalists (VCs). Moreover, VC reputation negatively moderates this relationship such that IPO firms backed by reputable VCs are less likely to manage earnings, suggesting that reputable VCs serve an auditing function following an IPO. Overall, we provide insights into signaling theory by examining negative signals arising from the behavior of multiple agents in an IPO firm.