September 23rd, 2014, 9:35 am
I'm not a VaR fan, so I'll give you a couple of other practical suggestions. For starts, expiring options can be very high gamma and thus a bit of a crap shoot, so for starts make sure your valuation algorithms can handle time increments less than one day. Legacy systems sometimes cannot do this and only return intrinsic values on expiry days. Second, be mindful of maturity and strike concentrations, use suitable reports and a limit structure to inform about and control these.