This paper investigates the value effect of large investors through their impact on corporate investment policy using a sample of listed firms in the Chinese stock market where large shareholdings and concentrated ownership are a norm. We find that the impact of capital expenditures on firm value is closely related to the level of large shareholdings (non-tradable or state shareholdings). Capital expenditures are negatively associated with firm value if firms are controlled by entrenched large shareholders. Although there is a general tendency of over-investment, the negative impact of over-investment is cancelled out if firms are controlled by incentive-aligned large shareholders. We also find that, the incentive-alignment effect of large investors is stronger in scenarios where agency conflicts are more intensified. Our findings suggest that capital investment is an important channel through which the value effect of large investors is achieved.