Well, WWTS is a publuc company that has huge swings. Their quaterlys never mention hedge trading.
WSEX is not a real high limit shop and not a shop I've heard of ever oweing or being owed by any other books.
I'tops would be crazy to hedge or bet out, way too low of limits.
SOS - maybe. They are pretty sharp and know their clients real well. Plus, being smaller than the above ones, might make sense for them to hedge.