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...

Straddles on individual stocks generally earn significantly negative returns. However, average at the money straddles from three days before an earnings announcement to the announcement date yield a highly significant 3.34% return. The positive returns on straddles indicate that investors...