International audienceThis paper investigates whether the extent of corporate voluntary disclosure mitigates asymmetric information and adverse selection in the Euronext Paris stock exchange. We apply a disclosure index as a proxy for the extent of voluntary disclosure and use different spread measures to estimate both asymmetric information and adverse selection. Our findings show a negative relationship between the disclosure index and asymmetric information and adverse selection proxies. An analysis of sub-indexes provides additional mixed results. Several asymmetric information measures are negatively related to the volume of financial, non-financial and voluntary governance information in corporate annual reports. Nevertheless, the effect of strategic information volume is statistically significant only for effective bid-ask spreads. On the whole, these results are consistent with the view that high corporate voluntary disclosure is associated with narrow spreads and low adverse selection costs