Do insiders trade on innovation?

We find that pure insider share purchases-which we define as insider purchases over two successive years without any corresponding sales-are a strong predictor of a firm's patent applications. The predictability increases with the quality of the patent: Applications for the highest-quality, breakthrough patents increase by 21% in the year following pure insi-der purchases in our sample. These purchases are associated with large abnormal stock returns of 1.1% per month (14% annualized) over the subsequent three-year period. We also document that stock price responds less to the subsequent announcement of the grant of patent if the application for the patent has been preceded by pure insider purchases, consistent with the idea that insider purchases reveal information about future firm inno-vation. Our evidence has implications for understanding insider trading within technology companies that have become a dominant feature of US stock markets in recent decades.(c) 2022 Published by Elsevier Ltd.