This paper examines whether mandatory disclosure affects the extent to which firms learn from external market participants. Conventional wisdom suggests that mandatory disclosure should increase the total amount of information in financial markets. However, disclosure can also reduce investors' incentives to acquire and produce information. Using the JOBS Act to identify variations in disclosure requirements, this paper finds that firms with reduced disclosure requirements attract more informed investors and learn more from financial markets than those with stricter disclosure requirements. This learning is concentrated among firms that attract sophisticated investors, particularly those with industry expertise, and weakens once firms are forced to disclose more information. Overall, the results suggest that one benefit from regulators’ recent efforts to reduce U.S. firm disclosure requirements is an increase in firm learning.

We examine broad effects of MiFID II, which mandated unbundled pricing of analyst research in the European Union beginning in 2018. We find significant reductions in sell-side analyst following, particularly for firms for which the marginal analyst was less important (larger, older, less volatile firms with greater coverage and more accurate forecasts). High quality analysts (more accurate, experienced, and in positions of seniority) were more likely to leave the sell-side and move to the buy-side, while remaining sell-side analysts increased efforts to make their forecasts more informative (more accurate, more detailed, and more likely to include informative recommendations resulting in larger stock price responses). Firms responded to a loss of sell-side coverage with more frequent, forward-looking, and informative investor relations events, especially for firms that lost the most coverage. Our results support recent theoretical analysis predicting that unbundling had significant implications for sell-side research, buy-side research, and firm responses.