Anyone know if a company has to give a at least a 10 day notice of the ex dividend date? The company has to give a ten day notice of its wish to do a corporate action. They can set the record date, but the ex date is set by FINRA. If they don't give ten days' notice, they'll have to pay a higher fee. http://finra.complinet.com/en/display/display.html?rbid=2403&record_id=12829&element_id=9364&highlight=6490#r12829