The readability of 10-K reports and insider trading profitability

This study links the readability of 10-K reports to insider trading profitability. Using a sample of 102,060 insider transactions in the United States between 1994 and 2016, we empirically demonstrate that less readable 10-K reports increase profitability from insider trading. Consistent with the proprietary cost argument, we also document that readability impacts on insider trading profitability are more pronounced for research and development-intensive firms, for firms facing higher product market competition and trade secrecy, and for firms with lower levels of voluntary management disclosures. Overall, this study supports the proprietary cost and strategic information asymmetry channel of readability and suggests that less readable reports lead to the exploitation of information advantages by insiders. JEL Classification: D4, G14, G34, G40