EL SEGUNDO, Calif.--(BUSINESS WIRE)--National Planning Holdings®, Inc. (NPH), the nation’s sixth-largest independent broker-dealer network1, today announced half-year 2015 revenue of $500.4 million, which is consistent with the network’s revenue for the same period in 2014 ($500.4 million). The network also reported gross product sales of $9.9 billion for the first six months of the year, relatively in line with half-year 2014 sales ($10.1 billion). “Our solid first half results provide the fou