We develop a measure of how information events impact investors' perceptions of risk that is broadly applicable and simple to implement. We derive this measure from an option-pricing model where investors anticipate an announcement that simultaneously conveys information on the announcer's...

We document the growth of retail options trading over time and provide evidence that retail investors are drawn to options by anticipated spikes in volatility. Using data on options trades by clientele groups, we show retail investors purchase options in a concentrated fashion before firms'...