a view of the exterior of the jp morgan chase  co corporate headquarters in new york city may 20 2015 reutersmike segar may 4 reuters  jpmorgan chase  co jpmn said on wednesday it would raise its prime rate by 50 basis points to 4 effective thursday the decision comes after the us federal reserve raised its overnight interest rate by half a percentage point the biggest jump in 22 years read more reporting by manya saini in bengaluru editing by anil dsilva